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VenerableBede
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November 29, 2022
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ASHP- Will the existing 15mm diameter pipework be adequate? Should be 22mm diameter or more?

  • November 29, 2022
  • 12 replies
  • 2022 views

I am considering buying a house which has an ashp half installed. a huge amount of work/insulation has been done but not completed. The 3-layer radiators have been bought but not fitted. My question is whether the existing 15mm diameter pipework will be adequate? I read somewhere today that ideally it should be 22mm diameter or more.

Best answer by nealmurphy

Most things are possible if the system has been designed properly. I have 22mm feed with 15mm drops to radiators.

As others have said, it would be beneficial to find out who has done the design to make sure what is partly there is up to the job. Also, if getting a mortgage, check lender is happy with the current set up. 

12 replies

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BPLightlog
Super User
BPLightlogSuper User
Super User
November 30, 2022

There is some info here https://www.gov.uk/guidance/find-a-heat-pump-installer

Bring me Sunshine ~ E&E {Solar PV, Battery Storage, Hybrid EV, ASHP and Home Assistant automation}
    nealmurphy
    Newcomer
    nealmurphy
    Newcomer
    November 30, 2022

    OK

    I’d be inclined to review the whole installation given what you’ve said. For an installed system, it’s generally said that if you can achieve temperatures required with a 50 deg flow temperature, you can fit a ASHP without changing the pipe work or radiators. In your situation you simply will not know

    Where would I find a reputable person to check the system?

     

    Get in touch with a Heat Geek. https://www.heatgeek.com/

    Check out their videos on YouTube.

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