I did a google search and came back with industrial products, but no residential prosucts.
I have a System 2000 boiler and hot water tank. When the furnace is firing, the temp of the exhaust through the flue is around 400 degrees.
That seems like a horrible waste of heat.
Same thing with the dryer. It throws heat right outdoors, which also seems like a waste. (not really concerned with humid air, as it is winter and I have to run a humidifier anyway).
Is there any "safe" method to do recover waste heat from a boiler?