I've had a couple of tankless heaters and really liked how efficiently they worked, but both were very sensitive to silt in the water and required periodic flushing of the control valves. My favorite heater overall so far is the Rheem Marathon series. Not sure if you can fit one but if you can they are very light to transport and install and have a lifetime warranty on the tank. Basically the tank and liner are made of the same indestructible tupperware plastic as kayaks and then foam is injected between the two "hulls".
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