We're trying to go all-electric/solar and reduce reliance on fossil fuels. We currently have an 11 year old propane tankless combi-boiler that supplies hot water and also circulates water through a hydronic baseboard heating system connected to a thermostat (starting to slowly fall apart). We also have Mitsubishi heat pump split units that we use as our primary heat source in the winter (the boiler is more to keep the house above a minimum temperature to protect the pipes). These are in great condition.
Given our goal, I was thinking of installing an electric heat pump water heater to provide hot water for faucets, shower, wash, etc.. Because that wouldn't serve as a boiler, we would not be supplying any hot water circulation for the baseboards, and just rely on the splits for heating the house. When reading the documentation, it seems that they can perform at capacity when well under minimum temperatures we experience here in the winter.
My question are, is it ok to do this, and what problems might I run into?
- The house is 1300 sqft with OK insulation, but we'll be sealing and insulating any gaps/thermal bridges.
- We live in the northeast in climate zone 5 in this Energystar map.