It would make a "whole house" grey water heat exchanger make sense. Since the only time you have room in the water heater is when you use hot water the only time the heat exchanger would add water is when there is warm heat exchanger water to be added. The only exception would be a bathtub or sink full of hot water that does not drain while the water is still hot. If you had a dishwasher the kitchen sink wouldn't be a problem. The bathtub would be though. Maybe it would be best to have everything except the bathtub on a whole house exchanger and have the bathtub join downstream of it. (Assuming the use of a dishwasher)
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