A Cool Outdoor Tankless Water Heater - Boat Adaptable?

Probably be OK Pat. Would use a lot of gas though, you'd have to carry a 20# bottle at least. A little cylinder wouldn't last long... Not designed for a marine environment either probably, stainless steel/etc.

Charlie
 
Looks good. The only thing I would wonder about is the water pressure and flow in the boat. Unless you were just going to hook it to a hose at the dock. We need a real world test. Maybe we can all chip in a buck and find out how it works. Wonder if a bilge pump would supply enough water.
 
looks nice but i was wandering about water pressure, not at the spray head up on the supply side. if our water pumps don't deliver enough water you may end up with steam coming out the other end. any gaps or air in the system from the supply side could lead to the water boiling and expanding in the coils. this could lead to damage to the system and maybe your self. their web site states that unit supplies 1.5 gallons a minute and I would guess that you would need to supply 3 gpm to keep the pressure high enough to avoid air and steam. most water pumps on boats for sinks are smaller then that. you would need to go to a wash down style pump rated for 3 to 5 gpm. Any how thats the problems i see. take a look for coleman camp water heater. they have a smaller unit I was looking at for this same purpose.
 
I have one I got from Cabelas. I use it in the yard to wash the dogs. With a garden hose it will provide hot water for hours. Never runs out. Does not seem to use much propane either. It does have a shut off if there is not enough water pressure and it only heats when you turn the flow on at the shower head. If you can get enough water pressue it would work on (or next to) your boat. I do not know what the min pressure is though.
 
We have a similar model from Campworld for about $100. We have not used it on the boat yet, but sure it would work fine in fresh water. We have used in the back of our horse trailer, pumping out of a pail of water from the creek, with a 12v shurflo pump, hooked up to a battery. From a domestic water supply from the dock, you could eliminate the pump and battery.
 
On our 2005 CD25, Sea Angel, the factory installed a 'FLOJET',
"Quad II Diaphram", Automatic Water System Pump
(with an internal bypass valve), model # 4405-143.

According to the flyer:
This 12VDC unit draws 3.9A @ 10psi..
The flow is 3.3gal/min with a Max psi set by the pressure switch of 35psi.


Hope this helps.

Art
 
Multiple reasons not to do this on the back bulkhead--but some are: 42,000 BTU @ 1.6 gal p min. Temp on the back of the unit. Exhaust temp and venting. The above non marine, large tank, explosion/fire issues.

I have used a built in tankless in a boat (European model)--and it was OK--but smaller than this unit. Venting the CO gas is also a problem, and the reason they were pulled from the US marine market.
 
I saw one like this on a 34 Silverton once. It was very rusty and in poor condition, and if I had bought the boat would have come off immediately.

But-

I've seen a lot of people mount things on boats I never would and swear by them, so what do I know?
 
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