Ground source heat pumps

[Little Red]

Looking at getting a GSHP to replace our ancient solid fuel system. Reading some very positive reviews but also some horror stories about massive electricity bills... would anyone mind sharing a few facts and figures about their GSHP running costs please?

 

[akaPABLO01]

Looking at getting a GSHP to replace our ancient solid fuel system. Reading some very positive reviews but also some horror stories about massive electricity bills... would anyone mind sharing a few facts and figures about their GSHP running costs please?

More info

Is it to heat a single place or more than one?

Correctly sized you’ll see 3.6 to 1 heat to electricity. We calculate 16p/kWh is 4.44p

All heating systems operate mainly in Winter. You’re electricity bill will be higher during this time.

You shouldn’t rely on a quotation until full heat loss calculations are done as EPC figures are not worth the paper they’re written on.

 

[Little Red]

More info

Is it to heat a single place or more than one?

Correctly sized you’ll see 3.6 to 1 heat to electricity. We calculate 16p/kWh is 4.44p

All heating systems operate mainly in Winter. You’re electricity bill will be higher during this time.

You shouldn’t rely on a quotation until full heat loss calculations are done as EPC figures are not worth the paper they’re written on.

Yes it's a single property - 131m2 floorspace. We've been priced for a 12kw nibe pump. they've quoted £790 in running costs. Just don't know how much to trust that!

 

[akaPABLO01]

Yes it's a single property - 131m2 floorspace. We've been priced for a 12kw nibe pump. they've quoted £790 in running costs. Just don't know how much to trust that!

Did they complete a room by room heat loss measurement?

See if you have an Epc on this website using your postcode and reply the heat and water kWh figures

https://www.epcregister.com/reportSearchAddressTerms.html?redirect=reportSearchAddressByPostcode

 

[Little Red]

Did they complete a room by room heat loss measurement?

See if you have an Epc on this website using your postcode and reply the heat and water kWh figures

https://www.epcregister.com/reportSearchAddressTerms.html?redirect=reportSearchAddressByPostcode

They did measure all the rooms and they were after u values so I assume so?

Epc says space - 29556 and water 3655.

 

[akaPABLO01]

They did measure all the rooms and they were after u values so I assume so?

Epc says space - 29556 and water 3655.

ok, the assumptions i have made are;

You are on oil and paying 34p/ litre (this does not help running cost of GSHP it just is a comparison in cost versus)

I am assuming that they want to install the 12kW F1145 GSHP model by NIBE
https://www.nibe.co.uk/Products/Ground-source-heat-pumps/NIBE-F1145/

Using this GSHP model assumption and a flow temperature of 50°C i concluded your efficiency being 3.43:1 (3.43kWth for every electricity unit spent)
https://www.microgenerationcertific...ct_type_id=6772&page=1&limit=10&keywords=nibe

I have used 16p/kW for electricity unit. I can adjust this to reflect your current price but this really does reflect future cost you will pay over the 7 years as an average or worst case scenario being that is what electricity new charges are.

i have assumed you will be getting a 300 litre cylinder

I have not calculated a heat loss transfer, the system transferring heat through highly insulated DUO pipe (Outside underground water transfer)

Annual running cost of GSHP: £1,742.00
RHI annually: £4,348 / 7 years £32,622.18 payment 20.46p/kWth
Total EPC value: 33211 / RHI qualify 21,254 - MAXIMUM QUALIFY 30,000

Using this quick calculation measure is not accurate in the total running cost when compared to an actual full heat loss calculation, it has been known comparing both the running cost using this method against heat loss a difference of +25% increase.

 

[Dangerous Deere]

We have GSHP in a 3250sq ft new house and we are delighted with it. Running costs for 12 months is €497.

 

[Biomass Bart]

SCOP will also depend on desired heating temperature - for most market leading pumps at 35C SCOP will be 5, 45C - 4 55C -3.

 

[Little Red]

ok, the assumptions i have made are;

You are on oil and paying 34p/ litre (this does not help running cost of GSHP it just is a comparison in cost versus)

I am assuming that they want to install the 12kW F1145 GSHP model by NIBE
https://www.nibe.co.uk/Products/Ground-source-heat-pumps/NIBE-F1145/

Using this GSHP model assumption and a flow temperature of 50°C i concluded your efficiency being 3.43:1 (3.43kWth for every electricity unit spent)
https://www.microgenerationcertification.org/installers-manufacturers/product-profile/?ID=303758&back=product_type_id=6772&page=1&limit=10&keywords=nibe

I have used 16p/kW for electricity unit. I can adjust this to reflect your current price but this really does reflect future cost you will pay over the 7 years as an average or worst case scenario being that is what electricity new charges are.

i have assumed you will be getting a 300 litre cylinder

I have not calculated a heat loss transfer, the system transferring heat through highly insulated DUO pipe (Outside underground water transfer)

Annual running cost of GSHP: £1,742.00
RHI annually: £4,348 / 7 years £32,622.18 payment 20.46p/kWth
Total EPC value: 33211 / RHI qualify 21,254 - MAXIMUM QUALIFY 30,000

Using this quick calculation measure is not accurate in the total running cost when compared to an actual full heat loss calculation, it has been known comparing both the running cost using this method against heat loss a difference of +25% increase.

Wow- thank you for taking the time to produce such an informative reply!