Every now and then I get a challenging call which stretches me for a solution. Today a fellow called who had put a hot tub in long ago when electricity was much cheaper- though he can’t operate it now ‘without mortgaging the house’ (due to KW rates). Switching his oil boiler to a pellet boiler, he wants to hook the hot tub up to the heat exchanger but with water that will not scald as it is 180 degrees coming off the boiler. (Due to a long unheated area along the route between the hot tub and boiler, the distance is such that omits the possibility of running a cold line to mix with). While the details are yet to be figured out, this call is an unique (yet good) example of people replacing both electric and oil heat with wood energy.