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Oil indirect or Heat pump hot water heater?
I'll be replacing my boiler/tankless coil combo this fall, and I want to decide on whether I should get a 40 gal indirect to go with the boiler, or to turn off the boiler in the summer by getting a geospring hybrid electric hot water heater. When I run the numbers they come out kind of close, so I'm not sure which I should choose.
For reference, oil in my area is about $3.39/gallon and with my old boiler/coil I uses .4 gallons/day in the summer for DHW. According to GE the Geospring in full heat pump mode uses ~1860 kWh/year for usage. Electricity in my area is 18cents/kWh, although a 6% tax hike is planned soon.
I'm concerned about the reliability of the heat pump, and I don't know if it will truly be able to run efficiently in heat pump mode all the time, especially because my basement can get cool in the winter (down in the low 50s or even high 40s when its really cold). Seems like indirect's are much simpler hot water generators, although it would be pretty nice to be able to completely turn of the oil boiler in the summer.
Does anyone have thoughts on which I should choose?