A 240V unit won't work in a 30A RV as it only has 120V I agree the typical residential models aren't suitable for an RV, as I stated previously. That's why you can only get propane models for an RV. The smaller electrical powered residential units I saw all had at least a small tank (4 gallons or so) so aren't truly tankless.
I recently researched this topic when our water heater sprung a leak and decided it was more practical (and lots cheaper) to just replace the tank than install a tankless model.
I recently researched this topic when our water heater sprung a leak and decided it was more practical (and lots cheaper) to just replace the tank than install a tankless model.