Heat Pumps - post here.

TLDR - need a recommendation for a possible replacement GSHP

I have a Climatemaster ground source heat pump for the last 19 years. Has been working fairly ok with a few manageable issues over the years. Last winter I had a leak and had it refilled with gas twice (a bit too expensive to be doing very often). Leak was repaired twice by refrigeration engineer who alluded you the possibility that a leak in the compressor (?) is game over for the unit. Currently not working due to low gas pressure again and has been so since May. My normal service engineer suggested a different refrigiration engineer to check for leaks but so far it’s proving very difficult to get him. Obviously we don’t need heat just now, but winter is coming and I’m afraid he’ll turn up in October and conclude the unit is beyond help, leaving me freezing and scrambling to get a replacement unit.

Could anybody recommend a good brand or supplier of a robust reliable GSHP as a replacement, should it become necessary (or warn of models to avoid!) Should I consider an air source one as they seem more plentiful now? (but I already gave the ground collector infrastructure )

House is about 2400 sq feet with underfloor heating

TIA.

this set up will impact the BER unless its actually part of the heated space and the work is certified

That's not the worst OSS quote I've seen. I was being quoted around €100k for the wrap, heat recovery vents, suspended floor insulation, new rads and a hp.

They were quoting insane numbers for the wrap 3x the price I paid and I'm currently getting quotes for HP closer to €6k and every single one ignored my request for solar.

I felt like the OSS were taking the hand and inflating prices where they could and then including a project management fee. So I went and priced it up and done it all myself for about €55k including solar. I have yet to get the HP in but I'm fairly confident it'll be significantly less than the OSS.

Question regarding energy usage and heat pumps. What is your total annual electriicty usage?

We built a new house four years ago. It has treble glazing, loads of insulation, underfloor heating and an air to water heat pump. On our quote for the air-to-water the company estimated that to heat an area of 2,300 sq ft and to provide hot water would require energy of about 12,000kwh per annum. Using the heat pump they estimated the nett energy would be a little over a quarter of that, about 3,200 per anum.

I would be expecting the remaining appliances to raise the enery usage to slightly above the national average - say 4,500 kwh per annum in total.

Now, I'm too embarrassed to put a figure on it but our annual electricity usage is much, much higher than 4,500kwh. Is there something amiss?

Broadly how much would you expect a new house to use in electricity? 2300 sq ft, no heat gaps, well insulated, single story, polished concrete floors, pretty up-to-date etc etc.???

Check your meter for a few days in a row to see how many units you use. Then turn off heat pump and see what you use on an average day without it. Then you can see if the house, heatpump or both are heavy on juice.

Gonna be a little slow to do that but worth it big time. Every unit you save is money in the back pocket straight away.

If you have solar AND become more energy conscious, you're away with it :)

Have you checked your hot water settings etc. following advice here I tweaked our AWHP parameters setting water to 55 and the sterilisation to 60. It’s made a massive difference from what I can see so far in terms of units used, granted I have no data on space heating yet but just a suggestion.

I have a similar setup and house size to you but it is a dormer. 8kW Nibe air to water.

I have a separate small consumer unit for the HP and pump etc. This has its own meter so I have a better view on the usage.

2500kWh a year would cover my heating, DHW and a small amount of cooling on average.

DHW usage is quite low though and the heating would never be set to above 19/20 degrees.

6000 on EV

So maybe 4,800 euro in fossil fuel

6000/15 = 400*6*2= 4800?

Been in discussion with the OSS for over a year. Sloooow. Can't see a widespread national rollout of Retrofits succeeding based on our experience - high cost, slow process, v. long payback, uncertainty of outcome... Hoping to be proved wrong.

Will the HP work efficiently without external insulation wrap?can they give a guaranteed/estimated consumption rate for HP?

We're living in a 1950s semi-d. Getting attic and cavity wall insulation upgraded to current standards. Have been also quoted for an 11kw ATW heat pump plus 2kw PV solar panels plus replacement of some of our rads, fitting TRVs etc. UFH a non-runner in our case.

We're worried that, in an older house like ours, the HP won't heat the rooms to a satisfactory level (20*/21*) in the middle of the winter. Anyone any experience of this scenario? Also any idea of how much electricity this HP will use?

what is the projected HLI: if not <= 2 then no grant

So in the range of running off a battery invertor EPS in a power failure. Now i never expect to have a power failure in an urban environment but it is worth a just in case thought