GSHP Running Costs?

Hintza

Is there anyone here who has a GSHP and UFH who can give me some idea if it is meeting specified running costs as detailed when installed?

Or any links?

Still hearing lots of rumours that that electricity costs are high but I can't substantiate them.

trubble

I don't have GSHP, but I'm guessing it's down to whether the pump heats the hot water as well as ufh.
The COP will be way down if the pump has to get to 65 degrees, whereas with pure ufh it'll be running at a much lower temperature.
There may be a financial case for using an immersion instead.
Any decent man'fr should have various COP at different supply temps - just the one COP figure should set alarm bells ringing
Installation of the slinkies may have an effect too - too close together or not deep enough and performance would be seriously affected.
Green building forum may be a good place to ask this.

Loogerberuger

Hi there,

Excellent question - it seems it's very complicated, largely because it all depends on the house you're trying to heat (insulation, floor area, window sizes, available land etc), and whether you want to include hot water or not. These factors direct the length of piping required which directs the size of pump needed. The bigger the pump the higher the running costs.

There was a great grand designs showing a 12th century castle which gets heat and hot water solely from their GSHP. After 2 winters, the owner was delighted with his choice.

I'm about to renovate an old house, but have no access to gas which leaves the choice between oil and GSHP. I'm really left with no choice then, so I'm hoping that the GSHP will work well and not be too expensive to run. The Renewable Heat Incentive should ease the pain too as it pays back over 23 years.