Air source heat pump

Hi,

I'm looking to possibly get an air source heat pump to replace my very old and woefully inefficient boiler. Can anyone recommend any installers? I've had one round but the quote was ridiculous and they couldn't give a definitive answer on compatibility with my small bore pipe fed radiators.

I suspect the installers that are around are charging inflated prices to cash in one people wanting to go green, the actual wholesale prices I've seen for the pumps seem to be in the low thousands but the quotes run close to 5 figures :/

Thanks,

Peter.

Reply to
Peter Spikings
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I have an air source heat pump, but it's separate from the heating system, and just heats my main room (which is also where I work when working at home). It enables me to work at home without having the central heating heat the whole house. (Also gets used as aircon on a few hot days in the summer.) It is a two-part self-install unit, which I bought from B&Q 3 or 4 years ago after fitting one for someone else and seeing how good it was. It was around £400 at the time, but that was on special offer. They still sell similar units, but technology has advanced a bit since I bought mine.

A comment I would make is that air source heating has a certain range of outdoor air temperatures over which it works, but also a range where it doesn't work. I tend to find the house doesn't need heating when the outside is above 15C (solar gain keeps the inside warmer). From 15C down to 5C, air source heat pump works fine. Below 5C, it rapidly gets less efficient as the outside evaporator ices up and has to run defrost cycles, which is great fun for sending large fog clouds across the garden, but is probably no more efficient (and maybe even less efficient) than simply using an electric fan heater. I haven't tried running it below 0C, but I suspect it wouldn't really work at all and if it's that cold, I would need the central heating to heat the house anyway.

Reply to
Andrew Gabriel

What kind or ASHP?

Air-to-Air

- Individual units are =A3200+ on Ebay, DIY install

- Multiple systems exist, one external, multiple internal

Air-to-Water

- 8kW systems are =A31000-1200 on Ebay, DIY install

- You need oversize radiators or underfloor heating

- Reason is the delivered temp-rise is limited

Low temperature performance

- Current R410A refridgerant means poor performance

Reply to
js.b1

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