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Thermodynamic solar hot water

  • 05-06-2020 8:51am
    Registered Users Posts: 571 ✭✭✭ batman1

    There was a thread on this a few years ago and as it was fairly new on the market, there was a bit of scepticism.

    Looking at this system for hot water only. Due to a very small roof because of dormers, solar PV is not viable in my case.

    At the moment, our hot water comes from an oil boiler and/or stove back boiler with immersion during the summer. We have 1 shower from the tank and the kids use an electric shower upstairs.
    The oil can't heat water alone during summer. I'm told it's a safety thing with us having a boiler stove.

    So I'm wondering if thermodynamic solar is something to consider now that it has become more popular and more people have fitted it.
    Has anyone any experience with it or any advice?


  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 58,915 CMod ✭✭✭✭ unkel

    You are right in that if you have a very small roof to work with, solar thermal gives far more energy per meter squared than solar PV (electric). That said, solar thermal installs are relatively expensive (despite the subsidy) and the pay back time (given that they need maintenance too) is long, unless you use lots and lots of hot water (like we do i.e. a family of 5 with 3 teenage daughters)

    In your case I would do neither. Or if you can DIY, do a small PV system yourself.

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022

  • Closed Accounts Posts: 18,961 ✭✭✭✭ Shefwedfan

    Have you checked with a Solar PV company to see how many panels you could install?