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Old 29-12-2010, 13:29   #1
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Question Gas Water Heater or Combined Calorifier / Immersion Heater ?

Starting with a boat with no hot water at all, what route would you go and why?

It would be for a small liveaboard boat, spending roughly 50/50 between marinas and on the hook.

Also, and this may be a really stupid question, would a gas water heater have to be fitted by a 'professional' and certified like a household one would?
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Old 29-12-2010, 15:14   #2
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Coleman makes a really cheap camping tankless gas water heater that hooks to a propane tank and a garden hose for outdoor use only. Google tankless gas water heaters to see the whole range.
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Old 29-12-2010, 16:15   #3
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Thanks but I'd want to install a 'proper' system one way or the other.
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Old 30-12-2010, 08:19   #4
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I will assume you have a reasonable budget to get this done if you want a proper job. I would still go with an instant tankless system, either gas or electric. On a boat your size, your engine and generator can easily produce enough heat for hot water, but they may not be on when you want it. An electric heater will require you run your genset, so I would go gas. If the tanks are inside and the unit is inside, you may want to have a professional install it. Like your tank locker, the unit should be inclosed but open only to the outside, vented and flued. On a lovely boat like yours, that could get expensive, on a scow like mine I would bolt the sucker to the outside and drill a hole for the water pipe. Im getting ready to install one myself.
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Old 30-12-2010, 08:46   #5
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Just checked Amazon, for $900 you can get the 9.5 gals/min top of the line unit from Rheem, PVC vented, 95% efficient.
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Old 30-12-2010, 08:50   #6
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Thanks for the input. Just to clarify, this is not for my present boat, as pictured in my avatar to the left. Kamara already has the benifit of a full pressurised hot water system.

Im talking about a possible future replacement, this is a 30ft Catalac catermaran (Catalac 9m) made from GRP. Most have had hot water added but the one i'm interested in has not.

As smaller Cat's are quite weight sensitive, I like the idea of an 'instant' system that heats the water on demend, rather then adding a heavy hot water immersion/calorifier tank.
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