Your Marine Water Heaters Experts Suggest Doing Your Homework Beforehand

Raritan Engineering Company your marine water heaters specialists would like to share with you these topics we thought would be of interest to you this month regarding mastering choppy southern seas.

Your marine water heaters professionals know that once they have reached the Southern Ocean, the solo sailors have to deal with a series of low-pressure systems for a month or more. From the islands of Tristan da Cunha and Gough to Cape Horn, they have around 12,000 miles to sail along the wall of ice marking the limit of the ice drifting up from the Antarctic.

In the space of barely one month, the competitors go from the cold Vendée weather to the torrid heat of the equator, tropical downpours and then back into the icy conditions of the Antarctic. The Southern Ocean represents nearly 3/5th of the round the world voyage with a series of low-pressure systems rolling out of Brazil, Madagascar and New Zealand.

Today, icebergs are now avoided by the Race Directors, who have set up an ice exclusion zone around the Antarctic between 45°S near the Crozet islands and 68°S off Cape Horn. This zone implies a higher route flirting with the Mascarenes High (Indian Ocean) and Easter Island (Pacific Ocean).

The long way home

If rounding the Horn after more than fifty days at sea marks a huge drop in the levels of stress due to the lower risk of damage and the rise in temperature, the 7,000 miles that remain before returning to Les Sables d’Olonne are not that easy, particularly if other competitors manage to claw their way back into contention.

Go to see how you can always get more information as well as assistance on marine water heaters at Raritan Engineering.

Then, they have the Brazilian coast more or less within sight before the Doldrums appear over the horizon. Here, they pass to the west of Fernando de Noronha, before picking up the easterly winds associated with the Azores High. This area of high pressure can sometimes stretch out to the Caribbean, split into two areas, which move around, or shrink back to Europe.

The voyage should chiefly be sailed downwind, but for the first time in this eighth edition, there may be a rather different situation in the Southern Ocean, if the Indian and Pacific highs decide to block the solo sailors’ passage as they contend with the exclusion zone set up to avoid the ice from the Antarctic. To win, first you have to make it all the way around.

Intrepid explorers passionate about serious outdoor adventure won’t find a more exhilarating way to experience Antarctica than on this one-of-a-kind polar expedition. With just seven travelers on a handful of departures each season, this is a rare opportunity! Explore the Antarctic Peninsula by ice-strengthened sailboat, surrounded by seals, whales, penguins and icebergs.
While Antarctica is an epic destination for adventure travelers, most visitors never fully experience this pristine polar realm. The majority travel via cruise ship, often with more than a hundred other passengers.

Click here and see how Raritan Engineering has more information on marine water heaters.

via Vendee Globe: Southern Ocean Sailing

via Sailing Antarctica: The Ultimate Polar Nature Expedition


Marine Hardware Professionals Share the Benefits of Building Your Boat With Carbon Fiber

Raritan Engineering Company your marine hardware specialists would like to share with you these topics we thought would be of interest to you this month regarding how carbon fiber takes boat building to the next level.

Your marine hardware professionals know that like the word stealth, carbon fiber has crept into our modern language, and you’ll find its distinctive black diamond pattern on everything from clipboards to refrigerators.

Your marine hardware catalog experts understand that fiberglass was once heralded as the miracle material for boats, and it did, indeed, take a bite out of wooden-boat construction. Though it revolutionized boat construction, it didn’t quite prove to be the no-maintenance material originally promised (laughter in the wings), but it was a major step forward.

Well, the absolute definitive answer is yes — and no. Carbon fiber has some wonderful properties, but it also brings higher costs and a few downsides.

In the mold, Carbon Marine replaces typical fiberglass matting with woven carbon filaments.

The Carbon Upsides

Your marine hardware stores specialists know that fiberglass is a composite made from strands of glass that are woven into fabrics and reinforced with resin to create hulls and decks. Carbon fiber simply replaces those glass strands with filaments of carbon.

Why carbon fiber? This is a three-word answer: lighter, stronger, stiffer. These are the qualities that have endeared carbon fiber to the aerospace, automotive and military industries. Here’s a breakdown of those attributes.

Lighter: In simple terms, if you can build an object in carbon fiber — whether a boat, car or airplane — that is lighter than a similar object in fiberglass, you’ll get more speed and better fuel efficiency.


Carbon fiber has a strength-to-weight ratio about twice that of typical fiberglass.

Stronger: Carbon fiber is stronger than fiberglass, so it adds extra strength to the equation, which is why the driver of the first McLaren carbon-fiber Formula One race car walked away from a major crash when the car’s surrounding “tub” saved him.

If you build a boat that is lighter with equal strength, you’ll spend less time at the gas dock and more time fishing or doing whatever it is you like to do while boating.


Carbon fiber has a stiffness about six times that of E-glass, so it won’t flex or warp.

Stiffer: Stiffness is the last trait of carbon fiber, which has a modulus of stiffness about six times that of E-glass, an upgraded fiberglass used in boatbuilding.

Taco Marine launched a new line of carbon-fiber sport-fishing outriggers, which promptly won an Innovation Award at the 2016 Miami International Boat Show. Product development manager Jose Chao notes there was a learning process to take advantage of the material, but he adds: “Carbon fiber outriggers are an easy choice — they’re lighter, stiffer and stronger.

If you build a boat that is lighter with equal strength, you’ll spend less time at the gas dock and more time fishing or doing whatever it is you like to do while boating.

The Downsides

Your marine door hardware professionals understand that every silver lining has a dark cloud, and carbon fiber has a few, the first being higher cost. One manufacturer estimated the price of commercial-grade carbon-fiber composites to range from $5 to $20 per pound, depending on the variables, while fiberglass ran from $1.50 to $3.

Marine Hardware Experts Continues Discussion of Cost Effectiveness

You can find more information as well as get assistance on marine water heaters

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and on how carbon fiber takes boat building to the next level at Raritan Engineering.

Do you need that extra cost? For a Formula One car, speed is measured in ounces saved, so it clearly makes sense — for a boat to take your family on an afternoon outing, perhaps not so much.

Your marine water heater analysts know that carbon fiber is also fairly inflexible, which makes it unsuitable for products that need to flex such as skis and helicopter blades. Baseball bats and boat bottoms are another thing, however, and you want these to be rigid.

It’s an issue also faced with steel yachts, so it’s easily manageable, and the American Boat and Yacht Council addresses carbon fiber in a technical bulletin (E-11) that essentially says to insulate anything that has power coming or going.

Communication is another thing. While fiberglass is transparent to wireless signals, carbon fiber (like steel and aluminum) can reduce a Wi-Fi signal by up to 95 percent, according to Raymarine, which suggests taking care to separate electronics from carbon fiber by at least 4 inches to eliminate any ground effect that would inhibit the signals.

So there you have a look at carbon fiber. With it, you’ll get a boat that is faster, more economical, stiffer and lighter, plus has a better cruising range.

High Points

*Drop-dead gorgeous from the carbon fiber visible in the hull and console, plus the silver shavings in the gelcoat that added sparkle.

*Grab rails are everywhere for safety, along with padded coamings, bolstered seats and SeaDek flooring for comfort underfoot.

*Incredibly fuel-efficient — even flat out, it gets better than 1 mpg.

*Super-strong Armstrong outboard bracket is perfectly braced on the transom.

Low Points

*Trim tabs are too high for good “bite.” (The builder is moving them.)

*Expensive, although much of the price is the $100,000 Seven Marine outboard.

Cars, Planes and Boats

Carbon fiber is not new to performance vehicles. Check out some of its uses in other forms of exotic transportation.

Cars: Carbon fiber has been used in exotic cars since 1981 when McLaren built the first carbon-fiber Formula One racer that rendered the competition obsolete.

Planes: Boeing bet its company on carbon fiber when it built the 787 Dreamliner that uses 77,000 pounds in the fuselage and tail.

Boats: When the American Oracle team won the America’s Cup in San Francisco, it introduced the sailing world to carbon fiber.

So don’t forget these helpful pointers when deciding if you want to build your next boat out of carbon fiber. 1) Carbon fiber is lighter, stronger and stiffer;  2) carbon fiber is not cheap;  and 3) carbon fiber isn’t new and is being used everywhere.

Raritan Engineering always has more information on marine hardware, marine water heaters, boat water heaters and on how carbon fiber is taking boat building to the next level.

via Carbon Fiber Boatbuilding


Boat Water Heater Professional Gives Advice on Staying Safe in Life-Threatening Situations

Raritan Engineering Company your boat water heater specialists would like to share with you these topics we thought would be of interest to you this month regarding how to protect your boat from lightning strikes.

Your boat water heater experts know that this spring seems to have brought the most extreme weather in history. With heavy thunderstorms you will often find lightning. Lightning on the water can bring life-threatening circumstances.

Even though the odds are in your favor that your boat may never be hit by lightning, if it happens it can have devastating effects. Boat water heater installation experts say, don’t take a chance, protect yourself. If you are in a small boat and close to shore when a thunderstorm approaches, get in and off the water immediately. Better yet, don’t go out if thunderstorms are predicted.

Your marine hardware professionals know that the voltages involved in lightning are so high that even materials that would normally be considered non-conductive become conductors, including the human body.

You can find more information as well as get assistance on marine hardware and on how to protect your boat from lightning at Raritan Engineering.

Several marine water heaters for boats analysts agree that the voltages are so massive that if they start to travel through a boat’s structure – say through its mast – then meet with high resistance (for instance, the hull skin) the current discharge, in its attempt to reach ground, may simply blow a hole in the non-conductive barrier.

Boat Water Heater Expert Explains Further Lightning Protection

In theory, a lightning protection system is used to create what is know as a “Faraday’s cage,” so called after the late nineteenth-century scientist Michael Faraday. The principle of a Faraday’s cage is to provide a surrounding, well-grounded, metal structure, in which all of parts are bonded together and carry the same electrical potential.

So how does a lightning protection system work? In a boat, the “cage” is formed by bonding together, with heavy conductors, the vessel’s mast and all other major metal masses. A marine electrician must tie in the engines, stoves, air conditioning compressors, railings, arches etc. with a low resistance wire which would ultimately provide a conductive path to ground (the water) usually via the engine and propeller shaft, keel bolts, or better yet, a separate external ground plate at least 1 square foot in dimension.

Boat water heater connectors specialists know that this means that if the aluminum mast of the average sailing vessel is properly bonded to the vessel’s other major metal masses and is given a direct, low-resistance conductive path to ground, the entire boat should fall within the protected zone.

So don’t forget these helpful pointers on how to protect your boat from lightning strikes. 1) If you are in a small boat and close to shore when a thunderstorm approaches, get in and off the water immediately;  2) an even better tip, don’t go out if thunderstorms are predicted;  and 3) put forth the time and effort into making your lightning proof system. It will be worth the effort.

Raritan Engineering has more information on boat water heater, marine hardware, marine water heater, and on how to keep your boat lightning proof.

via Cone of Protection from Lightning – Faraday’s Cage

Marine Hardware Analyst Agrees With This Being the Best Way to Install Seacocks 

Raritan Engineering Company your marine hardware specialists would like to share with you these topics we thought would be of interest to you this month regarding the best way to install seacocks.

Marine Hardware Experts Have Best Way to Install Seacocks shK1zt

Your marine hardware expert’s best advice for anyone contemplating adding a through-hull fitting is don’t. Through-hulls sink boats. If you can accomplish the same thing by installing a tee-connector in an existing inlet or discharge line, you avoid boring another hole in the bottom of your boat.

New Through-Hull

As your boat hardware and accessories outlet we know that installing a new through-hull fitting necessitates a new hole in the hull. Always locate seacocks where they are readily accessible or you defeat the purpose of having a valve in the line. Before you drill the hole, double-check the location carefully both inside and outside the hull to make sure, for example, that inside there will be ample room to throw the handle, and outside the new fitting is not going to set up turbulence in front of your depth sounder or speed log impeller.

Select a hole saw the size of the fitting you are installing and cut the required hole by first drilling from the outside of the marine hull until the pilot drill in the hole saw penetrates the hull, then finish the hole by drilling from the inside.

Through-Hull Replacement

To replace a through-hull fitting, remove the nuts from the bolts through the seacock’s mounting flange and unscrew the bolts or drive them out with a hammer and a punch. Unscrew the seacock from the through-hull-with the help of a marine pipe wrench, if necessary.

You can find more information as well as get assistance on marine hardware supplies and a marine water heater and on how to find the best way to install a seacock at Raritan Engineering.

Marine Hardware Adviser Gives Thumbs Up on These Suggestions

Through-hull fittings installed with polyurethane sealant can be very difficult to remove. A length of 3/8-inch threaded rod (or a long bolt) which is a nice piece of hardware, will make the job easier. Slide a washer or a metal plate too big to pass through the fitting onto the rod and capture it with a nut. Pass the rod through the fitting from inside the boat, seating the washer flat on the fitting. 


Once the hole is prepared, the remaining steps are identical for a new seacock or a replacement. Cut a circle of 3/4-inch plywood 2 or 3 inches larger than the flange of the seacock, and bore out the center with your hole saw to form a ring.

Because you are going to thread the through-hull into the seacock, you can discard the lock nut. Insert the new through-hull fitting from outside the marine hull, then inside slip the wooden ring in place and thread the seacock onto the through-hull.

Tighten the two parts together. Most boatyards have a special step-wrench that grips the ears inside bronze through-hulls. A wedge of scrap hardwood will do the same job.

With the seacock tightened snugly–not too tight–you should have plenty of threads inside the seacock, but the length of the through-hull should not prevent the base of the seacock from tightening against the plywood ring hardware. If the through-hull is too short, replace the 3/4-inch thick ring with a new one cut and shaped from 1/2-inch plywood.


Insert the through-hull, put the hardware plywood ring(s) in position, and insert the mounting bolts through the hull and far enough into the plywood to prevent it from turning. If the seacock is bronze, the mounting bolts must also be bronze.

Tighten the seacock until it seats snugly on the ring and the mounting holes are in alignment. Remove the mounting bolts and heavily coat them for an inch or so below the heads with polyurethane sealant. Reinsert them through hull, ring, and flange, and install a washer and a nut on each.

So don’t forget these steps needed in installing a seacock. 1) New through-hull;  2) through-hull replacement;  3) dry fit;  and then 4) installation.

Raritan Engineering your marine parts depot has more information on marine hardware such as a boat water heater and the best way to install seacocks. See our extensive line of marine products on our website.

via Installing a Seacock


Your Boat Water Heater Supplier comments on how to call for help during a boating emergency

Raritan Engineering Company your

Boat Water Heater specialists would like to share with you these topics we thought would be of interest to you this month regarding how to call for help during a boating emergency.

Your boat water heater experts know that a lot of mishaps can occur out on the water, but thankfully most are more inconvenient and embarrassing than anything else. But when lives are on the line, you want every available resource dispatched to your position. A Mayday! call will bring that kind of help.

A Mayday – the term is derived from the French venez m’aider, meaning “Come. Help me” – should be transmitted if possible via marine-band VHF-FM radio Channel 16 or 2182 kHz MF/SSB.

Your marine hardware experts recommend that once you’ve made contact and given your information, Coast Guard Search and Rescue planners will keep you advised of their actions and give you an estimate of when boat rescue units will arrive on the scene.

Your Boat Water Heater Supplier has the following suggestions

The Rescue Coordination Center or local Coast Guard station may deploy a helicopter, rescue vessel or boat or nearby commercial ship, depending on your location in the water, local weather, availability of crew and equipment and nature of the emergency.

You can find more information as well as get assistance on marine hardware and on how to call for help during a boating emergency at Raritan Engineering.

When the Coast Guard receives your Mayday, the Mission Coordinator will determine your degree of danger by considering several factors: the nature of your situation and the gear on board your boat, the accuracy of your position, the tide, visibility, current and sea conditions, present and forecasted weather, special considerations (age/health of those on board, for example), whether you have reliable communications, the degree of fear in those on board, and the potential for the situation to deteriorate further.

If a helicopter is dispatched, be sure to secure all loose items on deck (helicopter rotor wash is very powerful and unsecured items may turn into flying projectiles.) Lower and secure any sails, remove any equipment that may snag the line attached to the rescue basket, unplug any heater that might be activated, and make sure everyone is wearing a life jacket in case someone falls into the water. The helicopter is likely to approach your boat on the port stern quarter, because it gives the pilot optimal visibility from the cockpit.

Recently the Coast Guard began implementing a new command, control and communications system – Rescue 21 – which is now being installed in stages across the United States. It will vastly improve the Coast Guard’s ability to save lives and property. (For more information see

No new equipment is needed for you to benefit from Rescue 21, but you can help improve response time by using the heater at your disposal and by upgrading to a Marine-Band VHF-FM radio equipped with digital selective calling (DSC).

The U.S. Coast Guard is always ready to render aid to boaters facing extreme and imminent danger. Your best bet, however, is to reduce your risk of finding yourself in a dire situation in the first place. Keep your vessel’s hull, motor and on-board equipment in top condition, and have a good working heater. At the start of the boating season, get a Vessel Safety Check, offered free by your local U.S. Coast Guard Auxiliary, United States Power Squadron® or state boating agency. Having a life jacket on increases everyone’s chances of survival.

So don’t forget these helpful tips on how to call for help during a boating emergency. 1) Remember that a mayday should be transmitted if possible via marine-band VHF-FM radio Channel 16 or 2182 kHz MF/SSB;  2) be prepared with the right gear before heading out on your trip;  and 3) be sure to secure all loose items on deck after making mayday call to the Coast Guard.

Raritan Engineering has more information on boat water heater, marine hardware, marine water heater, and on how to call for help during a boating emergency.

via Mayday: How to Call for Help During a Boating Emergency

Importance of Marine Water Heater Winterization

Boat owners sometimes neglect to make a list of the maintenance they need to do before they put their boats away for the winter. Now is a good time to create your list if you don’t already have one. In this issue we are discussing checking the Anode in your Marine Water Heater.

Inspection of the Anode and proper winterization is required of a Marine Water Heater. Our world-renowned marine water heater,  1700 Series Marine Water Heater is specially designed for the marine environment.

  • Periodic visual inspection is recommended to be sure connections
    are tight, wires are not frayed and the unit is properly grounded.
  • Do not use solvents to clean the Marine Water Heater jacket.
  • Incorporate this inspection into commissioning procedure in spring and winterizing procedure in fall.

Marine Water Heater Anode

A removable Magnesium Anode is integral with the hot water discharge fitting.

  • The Anode should be checked at least once a year by removing it from the Marine Water Heater.
  • If the Anode diameter is less than 3/8″(9.5mm), it should be replaced.
  • If discoloration, unusual smell or taste develop in the water, inspect or replace the Anode.

The Anode is replaceable as a unit and may be ordered from Raritan Engineering your Marine Water Heater Specialist.

Raritan Engineering Company



marine water heater Raritan eng

Your Marine Water Heater Company Weekly Tip

Raritan Engineering Company your marine water heater specialists would like to share with you these marine topics we thought would be of interest to you this month regarding why Quantum Sails could help you win big.

Your marine water heater experts know that five out of the top six boats in this year’s J/105 North Americans, held in San Francisco simultaneously with the 51st annual Rolex Big Boat Series at the St. Francis Yacht Club, had complete or partial Quantum inventories.

While there was a lot of great racing in a number of classes and divisions, the J/105 North Americans caught our attention. The water courses included reaching legs, gates, and the tactical decisions about whether or not to seek current relief in the cone of Alcatraz.

Your boat water heater experts know that Quantum Sails checked in with five of the top six J/105 skippers on the format, the competition, and what it took to win.

You can find more information as well as get assistance on boat water heater and on why Quantum Sails can help you win at Raritan Engineering.

Phillip Laby, Godot, 6th Place — On Getting Good Starts

Our goal was the top three, we ended up sixth, partially because there is more talent out there, and partially because we didn’t execute our starts, we didn’t get good starts on the first day.

Your Marine Water Heater Company Has the Following Suggestions

The key to doing well in this marine regatta was getting good starts that set you up for going in the right direction on the first leg, and knowing where you were going.

Ryan Simmons, Blackhawk, 5th Place — On Preparation

The goal going in was to win on the water.

We’ve been sailing together for two years, working on different maneuvers and different settings for the boat, but once you’re out on the water sailboat racing is sailboat racing. To win that race was pretty exciting.

Jason Woodley, Risk, 3rd Place — On Consistency

A top-five finish was what we were trying to accomplish. We felt with the level of competition—there were 10 boats that could have won.

We knew it was going to be a light year and we’re actually a heavy-wind boat; so we really tried to keep the sails powered up, that was our real focus with our Quantum sails.

Jeff Littfin, Mojo, 2nd Place — On Climbing Back

We felt like we had the boat speed as long as we minimized mistakes.

It was disappointing that missed two races. Once the wind came in it was a pretty awesome Big Boat Series. It wasn’t too windy; it was probably one of the best weather-wise.

Shawn Bennett, Jose Cuervo, 2015 J/105 North American Champion — On the Challenge

What’s nice about Big Boat Series, is that there’s a different marine course every time for a new challenge, but for a North Americans, that’s a little different because you’re used to having your own racecourse. You’re not only managing your own fleet, in terms of covering them if you’re ahead, you’re also trying to manage the lay line and traffic management.On board water heater considerations should also be taken into account.

So don’t forget these helpful experiences that show why Quantum Sails could help you win….1) Phillip Laby, Godot, 6th Place — On Getting Good Starts;  2) Ryan Simmons, Blackhawk, 5th Place — On Preparation;  and 3) Jason Woodley, Risk, 3rd Place — On Consistency.

Raritan Engineering has more information on marine water heater, boat water heater, marine hardware and on why Quantum Sails could help you to win.

via Quantum Sails: What it Takes to Win

marine hardware

Your Marine Hardware Company Weekly Tip.

Raritan Engineering Company your Marine Hardware specialists would like to share with you these topics we thought would be of interest to you this month regarding how to get the most from your backstay.

Your marine hardware experts know that the discussion needs to start with how mast bend and forestay sag control the power of the main and jib, respectively. There’s not much we can do to change it on the fly. The rest of the shape is built into the main and jib with luff curve and luff hollow, respectively. When the mast is straightened, it pushes that material into the sail, adding depth. When the mast is bent, it pulls the extra cloth, and thus shape, out of the sail. When it’s tightened, cloth is pulled out of the jib luff, thereby flattening the sail.

Your marine water heater experts feel that the backstay takes advantage of luff hollow and luff curve simultaneously to depower the sails, much like an airplane lowers its wing flaps for high lift and retracts them when high lift is not required.

You can find more information as well as get assistance on marine water heater and on how to get the most from your backstay at Raritan Engineering.

Because it’s not the only tool to depower the sails, it’s worth talking about the other significant controls and how they work in conjunction with the backstay. Steering is an important one.

Easing the mainsheet certainly opens the leech, spilling power from the main. But easing the mainsheet also straightens the mast and sags the forestay, which is opposite of what the backstay does so well. It’s slight, but it does put power into both sails when you want the opposite. Depowering with the backstay is much more efficient.

Marine Hardware Agrees With This Advice

Since the leech opens and closes with adjustments to the backstay, it’s well worth a glance up at the top of the main, and re-trim if necessary. I often find that the leech opens so much, I need to tension the mainsheet in order to get some leech tension back.

At times, a puff might be too big or hitting too quickly and frequently to keep up with backstay. In these conditions I switch to playing the mainsheet because I can react more quickly. I will still use the backstay for trends and when things are less chaotic.

To augment the backstay, the flatter the sea state, the more mainsheet tension you can have while playing the traveler more aggressively. This technique helps keep the forestay tensioned and the mast bent, which is essentially assisting the backstay. I find this technique particularly effective with boats that have flexible masts. The choppier the water and the stiffer the mast, the less effective this is.

To use the backstay effectively, rig tune has to be set right. I try to set the rig so that in the lulls with my backstay off, the sails are fully powered. Thus, when the puffs hit, I can tension the backstay, keep the boat under control, and keep it at a constant heel. For most boats, it’s maybe a 4-knot wind range that the backstay will cover. If the puffs are beyond what the backstay can handle, I still set the rig for the lulls.

How do you know if you’ve overdone it with your backstay tension? Easy: If your overbend wrinkles become too extensive, you have too much. Overbend wrinkles are creases in the mainsail that start from the mast, usually just below the spreaders, and head toward the clew.

So don’t forget these helpful points on how to get the most from your backstay….the backstay takes advantage of luff hollow and luff curve simultaneously to depower the sails, it’s worth talking about the other significant controls and how they work in conjunction with the backstay, and to use the backstay effectively, rig tune has to be set right.

Raritan Engineering has more information on marine hardware, marine water heater, boat water heater, and how to get the most from your backstay.

via Getting the Most From Your Backstay

Your Boat Cleaning Product’s Weekly Tip

Raritan Engineering Company your marine hardware supplier would like to share with you these topics we thought would be of interest to you this month regarding 

Pressurized Freshwater Systems

The freshwater pump

Freshwater pumps provide water to fixtures onboard a boat. Pressurized water systems make life onboard more pleasant by providing water “on tap” for dishwashing, showers and various other applications. The intricacy of installing and maintaining one will depend on the number of outlets and accessories you choose.

Precisely where they are used: On all boats bigger than runabouts and day-sailers, fresh water on board is both a convenience and a requirement. The freshwater pump is at the center of the delivery system which ensures a continuous supply to the fixtures in galley, head and shower.

Qualifying Questions

Do you really want on-demand water supply?

Let your marine water heater company help you with some advice on this topic. On-demand pumps have a pressure switch that makes the pump build up pressure in the fresh water line. Any time water is required and the faucet is opened, a flow of pressurized water will be available. The pump turns on to preserve this pressure as required. By comparison, manual pumps have no pressure switch, and must be switched on by hand (via an electric switch) prior to when the water is needed.

How many outlets does the pump need to serve?

Freshwater pumps are frequently described by how many outlets they can supply (“for 2-3 faucets”). Extra taps or fixtures in the system might cause a decrease in flow capability, erratic flow, or extreme pump cycling if several were “open” at one time.

How much capacity do you want?

Pumps will generally be chosen by how many gallons per minute (gpm) they can pump, and/or by just how much pressure they can create. The freshwater pumps we provide have capacities between 1.1 and 11 gallons per minute. A few general standards for sizing the pump:

Number of fixtures

Recommended gpm


Up to 3.0 gpm.


Up to 4.0 gpm.


More than 4.0 gpm.

Do you want an electric or a manual pump?

Some pumps make use of electricity to operate, and others use muscle power. But almost any type of pressure water system should possess a freshwater and/or saltwater manual pump and spigot as backup. Electrical pump failure should not remove your accessibility to fresh water.

Do you want to pump both fresh and saltwater?

Many galley pumps can not be utilized with saltwater, because salt is going to damage the valves and seals or corrode internal metals. Nevertheless, to conserve freshwater, especially on small vessels with minimal tankage, you might wish to utilize saltwater for dishwashing. A preferred technique utilizes a bucket for the very first wash cycle before rinsing the clean dishes with freshwater, either in the galley sink or using the deck shower system. If you want to pump both fresh- and saltwater, select a saltwater-capable pump.

You can find more information as well as get assistance on a boat water heater at

Where would you mount the pump?

This question determines whether you need a self- or non-self-priming pump. Non self-priming pumps need to be installed at or below the water level, so water is already in the pump chamber. They can force water uphill against gravity. Self-priming pumps can be situated above the water level, since they can draw the water upward to them whenever they are turned on.

Exactly what type of electrical system does your boat have?

Is it 12V or 24V? We offer several pumps for both. Amperage draw varies by capacity, however the 24V model of a given pump might draw approx. half as much current as the 12V equivalent. NOTE: Starting amperage draw may be considerably more than operating draw. See individual product information in the Master Catalog.

Which port size do you need?

Greater capability pumps will possess port sizes of 3/4 or 1″ to enable even more flow. Some shower pumps provide multiple port sizes in between 3/4″ and 1 1/2″. Otherwise 1/2″ NPT ports are typical on freshwater pumps.

What to look for.

The significance of multiple pump chambers: Additional chambers typically imply smoother operation, along with less pulsation, in diaphragm pumps.

Variable Speed: New variable speed pumps offer a noticeable enhancement over accumulator tank systems. They change the speed of the motor to deliver the precise quantity of water wherever it is needed. There’s virtually no lag time, and there’s no drastic distinction in pressure if two or more faucets are open simultaneously.

Rated gpm: Gallons per minute. Explains the pump’s output under ideal (open flow) conditions. This does not take into consideration head height, friction in the system and other elements which will decrease output. For most boats, high gpm pumps may not be a benefit, especially if the fixtures only permit a restricted amount of water to flow.

Run dry capability: A few electric pumps could be damaged by running dry. This implies that the mechanism burns up or wears out when there is no fluid present. To avoid this problem, some pumps have “run dry” sensing units that spot a lack of water flow and shut off the pump to protect it.

Vibration dampeners make certain electrical pumps somewhat quieter, by absorbing some of the shock in the pump action.

A check valve is a mechanical valve which only permits water flow in 1 direction. It will also stop city water pressure (which is more than the pump can deal with) from going into the pump. Most diaphragm pumps have check valves built-in.

A pressure switch opens up the electric circuit to a pump (and turns it off) when the water in the system reaches a pre-set pressure, typically 35-60psi. It closes the circuit (and turns the pump back on) whenever the pressure falls below that point. It is the device that makes on-demand pumps work automatically.

The rest of the system.

Your boat water heater company recommends this…Freshwater Tank: We believe the finest tanks are made of thick-walled, high-density polyethylene, but versatile tanks can operate in an odd-shaped or inaccessible area. Tank size depends upon the space available and your requirements (anywhere from one to ten gallons per individual per day might be consumed). Ensure your tank’s deck fill has a snug seal and that your tank’s vent terminates the boat so your drinking water supply won’t be fouled by outside water.

Hose: Most pumps and fixtures are developed for 1/2″ ID hose. Be sure the hose you choose can deal with 35-40psi and is made from FDA-approved (nontoxic) products. Hot-water hoses must be reinforced to withstand high temperatures.

Strainer: Any type of electric pump ought to be protected by a strainer or in-line filter. Water system and washdown pump manufacturers typically sell strainers which could be attached upstream from their pumps.

Accumulator Tank: A sealed air chamber combined with a water reservoir offers expansion volume to reduce pump cycling from minor pressure modifications and provide a constant flow. Bigger tanks can easily store enough water to eliminate pump cycles when modest quantities of water are required. Up until a few years ago, this was the last word for functional pressure water systems aboard.

Freshwater Systems.

Municipal Water Inlet: Simply by connecting a drinking-water-safe garden hose in between a municipal water inlet and a faucet on shore, you’ll possess a constant source of pressurized water at the dock without ever having to fill up the tank or run the pump. To protect and isolate your pump and accumulator tank from possibly damaging high pressure, set up a one-way check valve as revealed in the diagram.

Water Heater: The water heaters we carry can be run at the dock by AC power or underway by getting heat from your engine’s cooling water. Also a small, 6-gallon heater is enough to offer hot water for washing dishes or taking a short shower.

Faucet/Shower: Showers, whether in the head or out on the swimstep, can greatly improve your quality of life on board. Higher capacity pumps with big accumulator tanks will provide the most home-like shower. When including an interior shower, it is required to possess a shower sump so you don’t satisfy up your dry bilge with slimy water each time you shower.

Final notes.

Add a water system purifier to your tank periodically in order to inhibit the growth of algae. The clarity of your water will improve and your system won’t grow a permanent green lining. Boat owners that venture far offshore should think about adding a watermaker to their freshwater system. Use high quality hose and hose clamps and examine the whole freshwater system frequently. Sailboat owners ought to consider putting in a siphon break in the drain lines of sinks, or turning off sinks’ thru-hulls when not in use. It’s feasible to heel over to where the sink is below the waterline, establishing a siphon that can flood the interior of the boat.

So don’t forget these beneficial stats on what type of freshwater or saltwater pump you need for your boating needs.

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