Raritan has electric water heaters with engine option, they have (I think) from 6 gallon through 20 gallon sizes. I just replaced my 20 gal. Check on ebay for better prices. There are a couple other companies mostly made for boats which may work. The Raritan is round so don't know if they will fit.
If you can't find one to fit you could always eliminate the engine option by connecting the hoses together. There may be valves on the engine to turn off the coolant flow through the hoses.
Good luck.
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