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Our 10 year old Grant heat pump failed

 
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Air Source Heat Pumps (ASHPs)
Last Post by Deltona 4 months ago
27 Posts
9 Users
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Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 2 years ago
Posts: 1155
13/05/2026 12:29 pm  

Posted by: @deltona
↑

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
↑

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: 9 months ago
Posts: 54
13/05/2026 6:20 pm  

Posted by: @toodles
↑

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

There aren't many, if any 🤣 

 



   
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 Deltona
(@deltona)
Trusted Member Member
Joined: 9 months ago
Posts: 54
13/05/2026 6:25 pm  

Posted by: @batpred
↑

Posted by: @deltona
↑

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
↑

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.

 

This thread is about Mike, my response was to Mike.

 



   
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