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Originally Posted by kerry edwards
On boats and RV's you'd have to be plugged in to get long effective use. In both instances, I prefer propane tankless heaters. The only downside is they have to be vented but the smallest units are quite compact and very efficient. They can also be used as mini-boilers for hydronic heating if necessary.
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I'm not a boat or RV guy myself, so tell me - what sort of electrical service (voltage and current rating) is typically available when one is "plugged in"? That by itself would establish the maximum flow of hot water that could be had for a given temperature rise from a tankless electric unit.
That's why I, too, mentioned LP gas units. If heat's what one wants, then things that directly burn fossil fuels really pack a wallop.