Steven......2 months ago completed a Norcold to residential conversion in our 2003 36 ft. Holiday Rambler Endeavor; had the front propane heater under refer unit. There were three units I found that would fit the opening, with no alterations. Believe all three were 13.9 cu ft. models, so almost 2 cu ft. bigger than the Norcold. Frigidaire FFHT 1425 V, energy start rated, a Whirlpool and GE unit. All three carried, but NOT necessarily in stock or currently available, by Lowes, and HD. I wanted black, none available or on order, so lucked out a a Lowes and got a white unit and painted black. Any of the three would have worked in my unit, but I preferred the Frigidaire based on what an appliance repairman friend advised me. Plus it was the only one Energy Star rated. MH came with a 1500 watt Heart Interface, Freedom 458 Series Inverter/Charger. We haven't taken any long trips with it yet, but I have run it several days without charging off 4, 3 year old Costco golf cart batteries, and didn't drain them down all that much. Once this thing gets cold, runs very little, and that was empty !!! Soooo, there's my story, and I'm stickin to it :))))))