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15kw pump for 225m2 1990's house - over kill?

 
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Air Source Heat Pumps (ASHPs)
Last Post by GrahamF 1 hour ago
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GrahamF
 GrahamF
(@grahamf)
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Joined: 1 year ago
Posts: 135
20/10/2026 10:41 pm  

@carpenterstation

Posted by: @carpenterstation
↑

I’d agree with all of the above. Especially sequencing. But you may need to move fast to avail yourselves of VAT and BUS.  Our install was massively over specified (16 kWh on a 450m2 floor plan).  House is quite well insulated - but old so not perfect and we have never needed anything like 16kw.  The whole house has never consumed more than 5kw in a 30 minute period - so I think that means 10kw would have been big enough!

I think you must mean “The whole house has never consumed more than 5kWh in a 30 minute period.”  That means an average electrical power over the half hour time slot of 10kW.  

Of course, it may have been running harder than that for part of the time, so 16kW is probably fine.  So long as the heat pump is not overconfigured by more than 30%, the efficiency impact should be small.  As you say, it is good to have some power in reserve for that really cold night.  Also, it mean that your hot water will get up to temperature faster.


Grant Aerona 290 15.5kW, Grant Smart Controller, 2 x 200l cylinders, hot water plate heat exchanger, Single zone open loop system with TRVs for bedrooms & one sunny living room, Weather compensation with set back by room thermostat based load compensation


   
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