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[Sticky] Got two or three heat pump quotes that don’t agree? Post them here.

 
Air Source Heat Pumps (ASHPs)
Last Post by Mars 16 minutes ago
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Mars
 Mars
(@editor)
Replacing my heat pump
Illustrious Member Admin
Joined: 6 years ago
Posts: 4999
Topic starter 15/11/2026 8:46 pm   [#3229]

One of the biggest sources of confusion I see on Renewable Heating Hub is the size of the heat pump homeowners are being quoted for. You get three installers round to survey the same house. One says you need a 7 kW heat pump, another recommends a 9 kW model and the third says you need 12 kW. You got several quotes to make the decision easier, so which installer has sized it correctly?

Oddly enough, more than one of them could be right. Manufacturers don’t always use the same conditions to rate their heat pumps. Two models with different kW figures on the label can deliver much the same amount of heat on a cold day at the flow temperature your home needs.

If that sounds familiar, post your heat pump quotes below. Tell us which make, model and size each installer has recommended and what they’ve calculated your home’s heat loss to be. If you have them, include the outdoor design temperature, the proposed flow temperature and which radiators they want to replace. If all you’ve got is "one says 7 kW and the other says 12 kW", start there. Just blank out names, addresses and contact details before uploading a quote or survey.

We can help you work out whether the installers disagree about how much heat your home needs, whether the models are closer in output than their labels suggest and what to ask before you commit.


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