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Re: Powering hot water heater with dedicated 12v
Brad, someone posted a conversion formula for 120<>12v resistive heating loads, either here on on a certain other forum, a week or three ago. Basically, it is NOT just a matter of driving loads and resistance, the heating element wants to see a certain wattage and if you drop the voltage, you've really got to up the amps in order to still get heat out of the heating element.
In practical terms, you either want to apply the rate 120V or ideally, find a 12V heating element for it. There may be one, targeted for the RV market, that bolts right up. Raritan might know. If not, you might be able to have an adapter threaded up to make one fit.