This would work well in my house, but not for the stated purpose. We have a hydronic heating system (hot water circulates through pipes to toasters...kind of l

This would work well in my house, but not for the stated purpose. We have a hydronic heating system (hot water circulates through pipes to toasters...kind of like old radiators but more efficient). A heat exchanger from graywater to our heating system would help our winter gas bill quite a bit. Tying it to the dishwasher and washing machine would help out a lot too.