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Ground Source Heat Pumps

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lovesgshplovesgshp Forumite
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If anyone wants info on these, then please let me know, as have had one for over 5 years.
As Manuel says in Fawlty Towers: " I Know Nothing"
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  • w50nkyw50nky Forumite
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    Its always good to have input by people who have had real world experience of these systems. It will no doubt be of benefit if you could give details/costs and your views of your system.

    Thank in advance!
    If at first you don't succeed, skydiving is not for you! :dance:
  • RolandtheroadieRolandtheroadie Forumite
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    Looked at these a couple of days ago. The site I looked at said they would not be very/as effective in an older property (draughty with poor insulation) and better suited to a modern home that meets current standards for draughtproofing and insulation.
  • lovesgshplovesgshp Forumite
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    Okay, I live in Italy, in a mid 18th Century stone house at 450 mtrs altitude, close to a mountain range. Roof is insulated, double glazing and underloor heating (No wall insulation). Floor area heated 120 sq mtrs @ 19C 24/7. Hot water 48C 24/7 with regular boost to clear bacteria risk.
    GSHP: IVT Greenline HT+, 11Kw output inclusive of DHW cylinder. Cost installed here circa Euro 14K plus excavations for ground loops. You would probably be looking at lower cost in the UK.
    Electricity here is more expensive, so if someone can give me the cost per unit in the UK, I can give an idea of the rough cost based on pump running hours.
    I have 5 other people install the same system and all are really pleased, as no maintenance ( apart from clean 2 filters, ( which takes about 15-30 mins ).
    Ask away if you need more info
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • lovesgshplovesgshp Forumite
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    Heat pump running hours for Nov - Dec: 198 (8/11-6/12)
    Dec - Jan: 321 (6/12-03/01)
    Multiply the figures above by 2.1 ( the kw the pump uses ) then by your unit kw cost for electricity, to give an estimate of the running cost.
    We have not had as much snow as yourselves, but have still gone to -10 at night
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • geotherm wrote: »
    If anyone wants info on these, then please let me know, as have had one for over 5 years.


    Hi, what is your general opinion on the ground source heat pump? would it work efficiently with underfloor heating? And do you know rough costs of replacing an oil boiler with ground source heat pump? Thanks
  • lovesgshplovesgshp Forumite
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    My opinion is that it is the best form of heating, but then I am biased having spent the last 5 years with one. Underfloor heating is ideal for them, as you use low heat curves (usually max 35-38C).
    As regard to cost, I would suggest that you try to get a quote from one of the specialist UK suppliers, as we only deal with Italy, where costs are much higher than UK.
    If you let me know the approximate floor area of the house and insulation level, then I may be able to give you an idea of the pump size to look for.
    Remember you need a good size ground area if you go for the normal ground loops, otherwise there are compact collectors which only require about 40sq mtrs area. Boreholes are the most expensive.
    Try this company for a quote: iceenergy. I cannot post the link as a new user, but a google search will bring them up
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • RolandtheroadieRolandtheroadie Forumite
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    albyota wrote: »
    Geotherm, keep within the forum rules, I think it's safe to say we all appreciate any info you have, i.e running costs, COP's, sizing methods, cost of installation etc.
    Thanks

    Can a system in Italy really be comparable to a system in the UK?
  • lovesgshplovesgshp Forumite
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    There is no real difference. Winter temps where we are in central Italy close to the Sibillini mountains get low in the winter, albeit not as bad as in the UK this year. The pump we have is designed to work down to -35C. Last year in Jan-Feb (our coldest months I was getting -1 to -2C feeding back into the ground loop ). House temp still stayed at its set temp of 19C and if I remember correctly, the 3Kw immersion only kicked in for about 2 hours overall when we had a really cold spike overnight. ( It will not switch on unless the pump compressor has had to work for over an hour ). In fact over 5 years, the immersion has only run for 24 hours in total, which is mainly to sanitise the DHW against bacteria.
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • lovesgshplovesgshp Forumite
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    Thanks Scotsman. I have read with interest the EST report and it does throw up a lot of questions. We are more tightly monitored here for grants etc. To get a tax reduction, you are required to state that the heat pump will give over 20% savings at least over a conventional system. With that you can recover up to 55% of all costs involved with the installation, even if this means having double glazing installed. All houses have to have a energy certificate to state the heating requirement ( thermal performance ).
    Energy costs here are very high and based on consumption, low to 1440Kw p.a, then to 2400, next to 4400Kw and then over that. We run from 11 cents Kw to 24 plus tax @ 10%. The house here uses in total circa 10k per year, although the pump only uses 1/3 of that consumption.
    I have one client who was using Euro 6000 in gpl per year, but this is eliminated and the GSHP is costing him between 1500-2000 Euro.
    As Manuel says in Fawlty Towers: " I Know Nothing"
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