Hot water heater strategy
Been thinking about the best way to set up my hot water heater system and wanted to bounce my idea past the readers of GBA.
Zone 5A - Central Illinois. Water heaters will be located in basement. Family of 5 (3 young kids) with plans to accommodate elderly parents if necessary in the near future.
HVAC system is a 3-ton GSHP with desuperheater that can provide some water pre-heating but not enough to meet DHW demand by any means.
My original plan was to buy one HPWH and one electric resistance water heater. I would plumb the HPWH to the geothermal unit and HPWH would preheat the water to set temperature. This pre-heated water would then draw into the electric resistance storage/"boost" tank which then would have the hot water lines running out to the house.
My theory is that the "boost" tank would rarely operate...only to maintain set temperature due to stand-by losses. Otherwise majority of hot water would be generated by HPWH and "free" heat from geothermal. Plan would also include to wire and plumb such that the "boost" tank could be bypassed/turned off down the road as occupancy fluctuated.
Thoughts on this plan?
The monkey wrench that just got thrown into it is big box store is offering 50 gallon GE Geospring for $999 (regular $1199) and my local utility is offering $300 rebate on purchase as well (only on one though). So that gets down to $699 which is cost competitive with a lot of straight electric resistance tanks. So now I'm thinking, "Maybe I should just buy two Geosprings for the $1698." That's still $700 less than the Stiebel Eltron 300 80 gallon.
I'm thinking this might be the way to go. Any input/advice is appreciated!
Posted May 22, 2014 1:02 AM ET
Edited May 22, 2014 4:27 AM ET
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