In an earlier contribution to this discussion,
wrote:


I am heating with oil so air source is a good lot cheaper than oil
1kw in = 3-4kw out. Plus very little servicing and no oil tank
required.
An average size house requires 12kw of heat just
to maintain temperature in cold spells.


So why do you need 9kW to drive the pumps - 3 or 4 should be more than
enough?!
--
Cheers,
Roger
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