http://www.jcwhitney.com/autoparts/...Id-100000165025/Pr-p_CATENTRY_ID:100000165025 25k btu heater runs off engine coolant. I'd like to get somethin for the truggy since i have no heater at all now. They have a 33k btu one too. Just curious if anyone has one and how well it works. Seems like apretty good idea to me.