Quote:
Originally Posted by djmarchand
Isotherm has a stainless steel tank and is one of the few or maybe the only marine hot water heater available with two coils to do what Brian suggested: one coil for you engine jacket water system and one for your hydronic heating system.
Whether that helps of course depends on whether you have a hydronic system and if it is cold enough to fire it up.
David
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Install a 'summer loop' into the hydronic system. It bypasses the full hydronic circuit. That way you aren't heating the whole boat if all you want is hot water. Basically gives you hot water on demand, at the dock or at anchor. The Webasto (hydronic) furnace doesn't need to run for long.