I tested the Truma water heaters before they went into production. I ran my old tank heater on electric didnt really notice a great increase of propane. But I did notice quite a drop in electric. I am very satisfied with my production model but use a lot more water. 
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Happy Trails To You
Tom & Cheryl Brockman S.O.I.T.C. Charter Member
2015 39DBRS3, Truma water heater, 2inch lift, custom paint
2011 RAM Cummins 3500 Dually
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