Has anyone else looked in to this?
Airgenerate.com | Adaptive Energy Solutions
It's a heat pump that sits on top of your water heater.
I wrote them a few questions, such as what it's efficiency is in a basement at 55F as their numbers are all base off 68F, I also asked if they have any problems being hooked to a timer and only coming on a few hours per day, so hopefully in a few days I'll have some answers.