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Our 10 year old Grant heat pump failed

Mike Patrick · 2026-03-06T07:59:17Z

@editor A sorry coincidence but my heat pump has also just failed! You have my commiserations and I agree with all the points made in your video. The decision now is do I just replace my 10 year old Grant heat pump with their latest model, or go back to basics and review all aspects of the existing installation. Mine was a new system (not a retrofit) with UFH but has the same problems you've encountered. The installer is long gone although our local heating engineers are Grant approved installers. But I've already seen some warning signs and I'm inclined to research more widely to be sure I'm getting an installer I can rely on to know what they are doing. TBH I'm not impressed that the ASHP only has a 10 year life. Mike

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Air Source Heat Pumps (ASHPs)

Last Post by Deltona 6 months ago

27 Posts

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Batpred

(@batpred)

Noble Member Member

Joined: 2 years ago

Posts: 1211

13/05/2026 11:29 am

Posted by: @deltona

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So financially speaking you'd have been better off with a gas boiler 🙄

Initial outlay should be made up by lower running costs. At the moment, our leccy is 3.5/kwh and gas 7.. Before efficiency is considered.

Posted by: @mike-patrick

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The above occured over several weeks during which I also sought quotations for a brand new system. To keep them all comparable I had restricted these to suppliers/installers of Vaillant units and on the basis that we would have a new water cylinder too. Our existing UFH pipework would remain. The quotes came in at from £11k to £14.5k.

But as @mike-patrick found, replacing a pump can easily hit the hurdle posed by the simple estimating approach that most installers are using.

8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC

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Deltona

(@deltona)

Trusted Member Member

Joined: 11 months ago

Posts: 54

13/05/2026 5:20 pm

Posted by: @toodles

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@deltona …without any of the many advantages provided by the heat pump regime! Toodles.

There aren't many, if any 🤣