We are thinking of getting an air con system in our home - mainly for summer cooling. I know there are also heatpump water heaters available.
Has anyone seen, in NZ, a combination heatpump air con unit that heats your household water while returning the "waste" cool air back into the house. No-one in NZ seems to sell / offer this.
No, I have asked someone who does refrigeration for a job why not, and basically the pressure is set for what temperature range you want, which makes its COP, if its got the pressure for hot water in it, then its lousy efficincy for a small temperature differential like cooling a house when its only a 15 degree difference between one side and the other.
That would make the costs overall worse than 2 seperate systems.
Also he didnt recommend the one outdoor unit and 2 indoor unit heatpumps for the same reason, its either efficiant with one running, or both running, of pretty poor effiancy in both configurations compared to getting 2 seperate inverter systems.
We have a heat pump hot water cylinder and a separate heat pump for heating/cooling the house.
I think that unless you lived in a constantly hot climate the system that you are talking of would not really be useful at all. Even then having the times when you need the water cylinder to work verses when you need cooling would be at odds more often then not.
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