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Heat pumps extract the heat from the outside air.
The water heater aspect of the heat pump is usually utilized during the cooling season to heat water. The high pressure refrigerant vapor is directed to the water heater first, then the condenser outside.
The heat recovery water heater is typically piped in series with a standard electric water heater that will provide service when the heat pump is heating the house or in times of high load on the water heater.
This could be a different product from what I am familiar with, do you have a link?
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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