Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
If you put a second tank in series on the same branch after the heat pump water heater tank, and make it small, it should only come on if the heat pump water heater tank is not up to temperature. This is similar to the instantaneous water heater that is used in the EnergyPlus example file SolarCollectorFlatPlateWater. That file also has a tempering valve in case the solar tank is too hot, but that would not be necessary for this application.
