• 67 Posts
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Joined 2 years ago
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Cake day: June 13th, 2023

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  • This is why I end up doing so much DIY.

    A job that takes a professional half a day could take me a whole weekend.
    But having to play “how likely are they to fuck it up, and how much of a pain will it be to fix” drives me up the wall so much, I often just buy the tool and do it myself.

    My time to do it: 15 hours, plus £200 in materials.
    Cheap tradesman: 8 hours, £450 total, non-zero chance I’ll have to rip it out and re-do it myself anyway.
    Specialist tradesman : 5 hours, £900-1200 total.

    So it either ends up being lots of work, a gamble, or lots of money. Quick, good, cheap, pick two!















  • I’m glad the new builds are still required, there is no good reason a new build with proper insulation and appropriate radiators cannot be heated by a heat pump.

    WRT your property: The only big practical difference in heating between gas and heatpumps, is the flow temperature of the radiators that can be reached while maintaining efficiency.

    So while getting things insulated is definitely the preferred change to make, increasing the size and output of the radiators can also get an old property in range. If you currently run your radiators at 70 to heat the house(so, water delta of 50), dropping it to 40 (delta 20) for a HP reduces the effective output by 70%.

    To make that up, the radiators either need to be sized for outputting 3x as much, the insulation/air tightness improved to reduce heat loss by 70%, or a combination of the two. If there is a possibility of installing underfloor heating, for example, that can make things a lot easier.

    The important thing is that properties are properly surveyed, and options worked out, rather than just rule-of-thumbing everything.

    I’m doing an ongoing project on my own house; gradually improving things from all angles, and as I go lowering the flow temperature of the boiler. Once I am happily running at 40, I plan to switch over to an ASHP.
    I was amazed the difference swapping out the 60s radiators for new ones made. At a guess, they’re putting out 4x as much heat.
    Not bad for £90!