RDXTIK
A diesel heater burns fuel from a small tank to heat a cabin, van or tent space without using the engine. If you only camp in mild weather or already have a heater, you may not need one.
Van, truck-camper and cold-weather campers.
RDXTIK 9L Diesel Heater, 8KW 12V/24V/110V/240V All in One Diesel Heater with LCD Switch, Remote Control, Muffler for Truck, RV, Home, Car, Campers, Boat, White (ASIN B0GRZFQPR3). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0GRZFQPR3).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.