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Aug, 2014

Friday

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  1. #1

    Default Air source heat pumps

    Has anyone installed an air-source heat pump in place of a regular boiler? If you have, how do they compare?

  2. #2
    Join Date
    Sep 2005
    Posts
    4,100

    Default

    Local council fitted them in sheltered accommodation throughout the area. They are warm and not too noisy. However electricity bills do not improve enormously! They are much more expensive to install (I had £7K quote for 3 bed semi as opposed to less than 3K for gas boiler). One other thing: in this weather the condensation runs off them and freezes on the ground forming a beautiful skating rink by the back door.
    Unshackled by the chains of idle vanity, A modest manatee, that's me

  3. #3

    Default

    Thanks for that. Were they installed in place of gas boilers do you know?

  4. #4
    Join Date
    Sep 2005
    Posts
    4,100

    Default

    No storage heating
    Unshackled by the chains of idle vanity, A modest manatee, that's me

  5. #5
    Join Date
    Jan 2010
    Location
    Central south coast
    Posts
    2,571

    Default

    I have had numerous consultations with my plumber who has been researching this and we conclude that at present these pumps are still in the developmental phase for existing properties and they are VERY expensive with no fantastic benefits at present.

    I was proposing installing one in a cellar conversion.

  6. #6

    Default

    Thanks for that, on an EPC, they won't be recommended as an alternative heating system where mains gas is available, unless savings of £10 per year or more are estimated, when compared with a modern condensing gas boiler. At my house, they don't get recommended by the EPC, so that fits in with what you are saying.

    This might change when the Renewable Heat Incentive starts (supposedly this year) and a tariff is introduced, similar to the ones for solar panels.

  7. #7

    Default

    I am particularly interested to know how they perform in the coldest part of the year, when you need them most. The manufacturers are claiming that they work down to -35!

  8. #8
    Join Date
    Nov 2010
    Posts
    5,223

    Default

    [QUOTE=EcoDave;416966The manufacturers are claiming that they work down to -35![/QUOTE]

    Define 'work'?
    It it means that they produce heat, yes surely. But if it means that they produce more heat than what they use in electric energy, that's be a breakthrough...
    ⊂ Unsuitable for nut allergy sufferers ⊃

  9. #9
    Join Date
    Sep 2005
    Posts
    4,100

    Default

    To be honest the (small) house I have seen it in (bungalow) is much warmer than with storage. They say 1kw in give 3kw of heat out. Heating has been adequate throughout the cold snap. There is no mains gas where they are fitted and options are calor or oil only....
    Unshackled by the chains of idle vanity, A modest manatee, that's me

  10. #10
    Join Date
    Aug 2010
    Location
    London
    Posts
    1,090

    Default

    They do work very well and even in current conditions they produce sufficient heat.

    The problem with retro fitting it to an existing property, is the condition and quality of that property.

    Being very simplistic, if the property isn't very well insulated, with good ventilation controls then an air source heat pump is never going be the best option.
    There is always scope for misinterpretation.

    If my posts can be interpreted in two ways, one that makes you feel angry and one that doesn't, I meant the latter.

    Everyday is an opportunity to learn something new.

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