Air Source Heat Pumps

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  • Interesting posts, i am considering ashp to replace the bad storage heaters. One question, does a 12kw heat pump replace a 12kw oil/gas boiler? From samtheman1k posts the plots show a drop in output from 12kw at 20degC to 6.4kw at 0degC. As i need the heat pump to provide 12kw heat output to heat my 4 bed home (calculations from total radiator sizing), would i have to buy a larger heat pump which can deliver the required output kw when the outside temp is 2-5degC (southeast winter)?
  • DewsyDewsy Forumite
    3 Posts
    Thanks everyone for interesting info. We are now at the stage of having to make final decision as to fuel type for the underfloor heating for our new build, gas is unavailable and we use oil in our current house which has risen hugely in price. We are seriously considering ASHP for our house.Any further comments to help us make the decision?:confused:
  • CardewCardew Forumite
    28.9K Posts
    Part of the Furniture 10,000 Posts Name Dropper Rampant Recycler
    Forumite
    Dewsy wrote: »
    Thanks everyone for interesting info. We are now at the stage of having to make final decision as to fuel type for the underfloor heating for our new build, gas is unavailable and we use oil in our current house which has risen hugely in price. We are seriously considering ASHP for our house.Any further comments to help us make the decision?:confused:

    If it is new build, have you considered GroundSHP?
  • It seems it is still a kind of emerging technology in this country, such that some of the biggest names are developing and currently releasing new products which are more appropriate to domestic installations. I have searched the net and it is not easy to find information from experienced people who have used the very newest kit.
    Currently I think air source has loads of potential to have running costs of 3-4p / kwh which will be around half that of oil or lpg. It then depends on how you are prepared to absorb the capital cost.

    If you are considering "air to water" so that you can use underfloor heating, the so called "boilers" have either the refrigerant moving from the external air unit to an indoor heat exchanger to transfer the heat to the water, or an all in one external unit which has the heat exchanger built in so all you have to do is pump your central heating water through it. The choice here is that of virtually no specialist installation necessary with the built in heat exchanger, but having to take care of the possibility of the water freezing going to the external unit when not in use. This shouldn't be a problem as many external boilers have some form of frost protection built in.

    Some names and models to look at:
    Mitsubishi Ecodan
    Daikin Altherma
    Hitachi AquaFree

    Please keep us informed if you find any demonstration units anywhere, and what you decide to install.
  • samtheman1ksamtheman1k Forumite
    464 Posts
    Part of the Furniture Combo Breaker
    but having to take care of the possibility of the water freezing going to the external unit when not in use. This shouldn't be a problem as many external boilers have some form of frost protection built in.


    A problem that is easily solved by adding antifreeze to the water (Fernox-11 IIRC), though can easily cost upwards of £100, depending on the size of your system.
  • samtheman1ksamtheman1k Forumite
    464 Posts
    Part of the Furniture Combo Breaker
    Cardew wrote: »
    If it is new build, have you considered GroundSHP?

    I'd second that. GSHP will be more efficient and quieter than ASHP, although will cost a bit more to install as you'll have to dig a trench/borehole.
  • DewsyDewsy Forumite
    3 Posts
    Thanks everyone.
    The reason we were considering ASHP over GSHP is down to initial outlay costs. Our very tight budget is already stretched to breaking so ASHP seemed a more achievable option. We do have the land for installing GSHP but have been put off by costs. Having read your comments we shall look very carefully into the difference in costs.
    Thanks again.
    Dewsy
  • SallyDSallyD Forumite
    1K Posts
    Uniform Washer
    Considering going to look at some new builds with an Air Source Heat pump system, one with under floor heating and one with radiators........did not have a clue what it was all about, nor the sales agents until I started reading this thread. One I know has the fan sited outside the conservatory, the other sited in the garden. ...very interesting about the noise and what to take into consideration.

    I am sure after my viewings I will be asking some questions.

    Thank you all for the useful information contained in this thread.
    SallyD
  • amtrakukamtrakuk Forumite
    630 Posts
    Last week I got my quote for an air to air heat pump and after doing the maths I really dont think im gonna go for it. To have a setup that does my front room, and the kitchen ajoined to it I was quoted 2.5k including installation. I was told this will also heat the kitchen which is just off the front room. It seems rather a lot to me. He also recomended a hot water cylinder which I dont have - sounds like more £££
  • Hi All,
    I have enjoyed reading this post and I can agree 100% with samtheman1k
    We sell Air to water heat pumps and I personally have one of our heat pumps fitted to my house. We do a 7.3KW version and an 11.5KW version. The heat pumps are from £999- £1199. Our heat pumps use Toshiba compressors and really work exactly how samtheman1k. The installation is just the same as installing a conventional gas/oil boiler and the savings to be had on both to you on running costs and installation costs is huge. Please feel free to visit our page http://www.wharfplumbing.co.uk/air_source_heat_pump.htm
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