A typical tank heat pump water heater, with the heat pump mounted on the top of the tank, will probably not have enough capacity. A Sanden split-system heat pump water heater might work, if the space heating load did not exceed about 10,000 Btuh. The Appliance Directory does list larger Air-to-Water heat pumps that can be used for this application. They are listed as “Heat Pump Water Heating Packages.” There is currently no good way to model these combined space/DHW systems. I have asked the CEC to fix this. I’m waiting for a response.