We had block heaters in all the fire engines and ladder trucks to maintain the engines warm while in station, from what I remember they fit in one of the engine freeze plug holes and connect to 120V A/C, even the Battalion Chiefs vehicles where plugged in with engine block heaters.
I believe that this tank-less heater that sprintstream has is not operating correct the water should be a lot hotter, they have used small tank-less heaters in Europe for some time and they do warm the water enough to be able to take a comfortable shower, although not to hot for my wife but hot for me.
Heating the water tank will only waste energy, and if the tank is in the passenger cabin, it will be very uncomfortable in the hot weather with a hot cabin, turn the A/C on full bore and watch the electric meter spin.
Check the unit out first to see that it is working as it is supposed to.
navegator
