Very similar to the diesel heaters used in larger sailboats. Repaired one in a 42 ft Catalina we were bareboating in the San Juan islands. They work very well in that boat which was almost 14 feet wide. Espar was one brand used in boats.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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