Hi Bill: The pump you are looking for, is made by the Laing company. www.lainginc.com and it's a great pump. It's not cheaper to run than a tankless water heater, though. A tankless unit only uses power when you open a tap, and doesn't run out of hot water. Tanks can't do this. The pump costs $375, the whole-house electric tankless costs $485. Also, if your water heater is in the centre of the trailer, the pump will only deliver hot water to one half. $750 for two pumps! Rather costly, just to get instant hot water. I supply both electric & gas tankless units. Electric units, range in size from 3kw to 28kw, and gas, from 38,000btu through 165,000btu. I can e-mail you info on all of them. Regards, Brian, at 800 851 9891.