[extragoode]

I was looking at some of the home ecomodding threads about solar water heaters and notices that they can heat the water up 140 defrees F and it struck me that that's about the same temperature the engine block heater I was looking at would do, give 25 degrees. The biggest problem I have with an engine block heater is that only works when I'm home. While I'm at work, it's parked outside. The water would be warmed by the time I was parking, it'd just need to keep it from dropping back down to freezing. Same concept as a thermos, but active instead of passive. I could put on a lexan hood and save some weight too. The other thought was to plumb it to the bed and set it underneath a clear bed cap, but that'd be a lot piping that could leak. What do you guys see as problems?