its just a water to water heat pump, I use one to heat my home. I could easily use a three way diverter valve and make domestic with it if I wanted.
I wonder if I installed 200 feet of black well pipe on the roof to pretemper my water, I could get a government grant too?
... water heater from Australia that captures waste heat from grey water. Called Nexus, it doesn't have the potential downside of chilling water that will need to go for bathing. It's still a new idea, but has potential. Here's a link. http://www.riftwood.com/texus/technology/