School buses have done this for years They have hoses off the radiator that run to the back to a heater core with a fan You could find one at a junkyard or on line and run hot water to it from your water heater Build a small box with a multi speed fan and there you go You could put a tee in the hot water line under the sink or something The problem would be a return line You have to get water circulating and back to the water heater Small pond pump for example Something like this...
https://www.millsupply.com/heater-co...40.php?p=97265
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2016 Thor Palazzo 33.3 Bunkhouse
Toad-2016 Dodge Ram 1500(Hemi)
HD Ultra Classic (goes with us)
Retired Firefighter/Paramedic, Truck Driver
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