• guy replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Are you sure about the £60 / day for the electric heaters? Running 5 2000 watt electric heater 24 hours per day at 14p per kWh comes to £33.60 per day. (Be careful running 5 x 2000watts appliance – it could overload the ring main)

    bottled lpg is worth considering with a gas boiler and radiator system.

    I live in a 3 bedroom listed building and h…[Read more]

  • Sammyf replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Have you thought about getting a burner with a back boiler? After all you’re already burning wood to keep the place warm, might as well make the most out of it…

    We have a large 24kw (or something!) burner with a back boiler that heaters up a thermal store. The thermal store provides hot water at a temperature suitable for radiators (the…[Read more]

  • burton replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    There’s something in this, and we bought the house knowing it would be hard to heat. At present, we have a room we can retreat to and get warm with a log burner, and at a basic level that’s all we need. Bedrooms are chilly, but actually that’s fine as long as you have a decent duvet.

    Have spoken to a local renewable energy consultancy/installer…[Read more]

  • pakpak replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Heat pumps work best with / can only provide a low output temperature (50degrees max?). There’s no reason why you can’t use them with radiators, you just need bigger radiators to compensate for the lower temperature they’re running at. If you have the wallspace and the listing allows, then this may be the way forward. Same goes for condenser…[Read more]

  • Phil replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    I live in a similar house. I think it is worth considering whether attempting to heat large, stone Victorian houses is sensible at all . Personally I think aiming to heat the whole place is either unrealistic cost-wise, or requires destroying the period interior (which I like) and possibly exterior for GSHP. It is however fairly easy to stay…[Read more]

  • oldfogie replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    My only experience of ground source is through neighbours who installed one in their stone, un-insulated farm worker’s cottage. They had to dig two huge trenches in the paddock, they regretted placing the pump in the utility room because the throbbing keeps them awake, they had to dig up all the floors and lay insulation then the pipework then…[Read more]

  • Kez replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    In the short term if you have a tent you could put it up in the children’s room over the coldest weeks. Gives them some cosy space. Or bunk beds with curtains.

    I’ve no idea about efficency, but all the people I’ve met who live in houses like that have an aga or similar and mostly live in the kitchen in the winter rather than trying to heat the…[Read more]

  • Neil W replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    One thing I wouldn’t consider if you are over 50 is a wood chip burner. Their hoppers need filling every few days with heavy bags of biomass. If you get one aged 50 and are tied to it for 20 years by the RHI, you’ll be lifting bags weekly aged 70 – and more frequently in the coldest, most horrid weather. I sometimes wonder how many retirees are…

    [Read more]

  • nab replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    If the listing of the building allows I would certainly look at some good insulation on the insides of the external walls.

    As you say it will make the window reveals even larger and there might be room features (eg coving) that would make it hard to achieve but I think it would make a big difference. Something like 100mm Kingspan or to be more…[Read more]

  • keith replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    I have ASHP – get some proper advice. You need an up to date energy cert, and then ideally a thermal model of the house (our installer did all this) to size the rads and the ASHP. Ours is paying for itself in no time thanks to RHI and saving vs oil.

  • housemouse replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    If their seasonal CoP is to be believed they seem really impressive. Can you install underfloor heating. If you have underfloor you can normally have a lower flow and return temp and thus a higher COP.

    What is the DHW provided by?

    I think there might be noise issues as well from the condenser.

  • burton replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Have considered them, and happy to continue to. Marks against them are being visually obtrusive and lower efficiencies in winter due to colder ambient temperature.

  • housemouse replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Have you considered air source heat pumps.

    Mitsubishi are claiming to have a new range of co2 refrigerant based ones offering CoPs of up to 4 whilst producing DHW.

    They sound too good to be true and they might be. I’ve not checked to deeply yet.

    https://www.ecodan.de/en/heat-pumps/co2-hot-water-heat-pumps/

  • jyn replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    biggest problem would be that the window reveals are already deep and this would make them even deeper.

    That’s exactly our situation. It makes it awkward to open/close them but the extra-deep window sills are a great place to put Stuff. We used plywood for the sills in the end – gives a nice look.

    This is the kind of imaginative solution I w…

    [Read more]

  • burton replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    We didn’t want to touch our walls inside to preserve damp proofing, and outside is limited by conservation area. So we threw stud partition walls up inside the real walls and insulated those. Added bonus is doing a rewrite is much simpler running stuff in the fake walls.

    This is a good idea, and the route we’ve gone down in both our old house a…[Read more]

  • burton replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Thanks, I hadn’t realised that a higher output temperature dropped the efficiency of the pump. At a COP of 1, presumably running costs would be similar to our existing electric heaters.

    If we accepted that the purpose of the heaters was to stop the house being cold, rather than actually making it warm, presumably we could push up the COP? I…[Read more]

  • jyn replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    Sorry to not answe your question, but…

    Grade II listing shouldn’t restrict you to badly. You should be able to make changes so long as they don’t damage the features behind the listing.

    We didn’t want to touch some of our inside walls – to preserve damp proofing, and outside insulation is limited by conservation area status. So we threw…[Read more]

  • guy replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    With a solid walled place like yours (and mine), the heat losses will be such that the radiators would need to be hot in order to provide sufficient heat. This means that the COP (roughly: heat out/electricity in) of your heat pumps will be close to 1. That means you will be paying electricity prices for each unit of heat. That means it would be a…[Read more]

  • dave replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    They rely on pushing out a low but consistent temp. So aren’t suited to poorly insulated houses and existing radiator systems that require water temps of 50 or 60 degrees.

  • burton replied to the topic Ground Source Heat Pumps in the forum DIY 1 month, 3 weeks ago

    That’s probably the other realistic option. Lower initial cost, and it would mean we didn’t need to dig up the whole garden. At this stage I’d prefer a heat pump for 2 reasons

    1. It’s more environmentally friendly

    2. Installation costs are likely to work out way cheaper in the long run thanks to the RHI subsidy.

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