NIBE S2125 Air Source Heat Pump Cost in Wales
Price on quote. NIBE S2125 does not publish an installed price and no credible third-party figure exists, so we show none. For scale, the median Boiler Upgrade Scheme install cost £12,908 before the grant (DESNZ Boiler Upgrade Scheme median, April to June 2026).
Boiler Upgrade Scheme grant (£9,000 for off-gas homes on oil or LPG).
NIBE is a Swedish heat pump maker whose UK company, NIBE Energy Systems, is based in Chesterfield. The S2125 is its R290 monobloc air source heat pump, sold in the UK in 8, 12, 16 and 20 sizes, with the 8 and 12 Quiet Mark certified. NIBE says it has over 40,000 heat pumps installed in the UK and also sells installations directly through its NIBE Home service.
NIBE S2125 models and running costs in Wales
Running costs for 10,000 kWh of heat a year at 26.55p per kWh (Ofgem price cap for Southern Wales, 1 October to 31 December 2026), at a 45°C design flow temperature: the midpoint of each model's MCS-certified 35°C and 55°C SCOPs.
| Model | Size | SCOP 35°C / 55°C | Installed, before grant | Running cost a year |
|---|---|---|---|---|
| NIBE S2125-8 smaller or well-insulated 2-3 bed homes. NIBE size label; rated heat output 5.3 kW at 35°C (Pdesignh, average climate), 5.52 kW maximum at -7°C | 8 kW | 4.8 / 3.59 | Price on quote | £630 |
| NIBE S2125-12 typical 3-bed semi. NIBE size label; rated heat output 6.8 kW at 35°C (Pdesignh, average climate), 8.34 kW maximum at -7°C | 12 kW | 4.8 / 3.71 | Price on quote | £625 |
Pros
- R290 refrigerant
- Quiet Mark certified (S2125-8 and S2125-12) with 49 dB(A) declared sound power
- Up to 75°C flow, and up to 65°C at -25°C outdoor
- Up to 7-year parts and labour warranty through NIBE Pro Partner installers
- British Gas became an approved NIBE service partner in March 2025
Cons
- Standard warranty is 2 years unless a NIBE Pro installer registers the extended cover
- Heavy and deep: 163 kg and 831 mm deep for both the 8 and 12
- Size labels overstate output: the S2125-12 is rated 6.8 kW at 35°C, 8.34 kW maximum at -7°C
- Annual servicing is a condition of every NIBE warranty
- No published installed price
Best for: Buyers who put quiet running and a long warranty first, and will use a NIBE Pro installer. Warranty: 2 years, up to 7 with conditions.
What Wales means for your heat pump
- Climate. January averages 7°C by day and 1.7°C at night, with 45 days of air frost a year (Met Office 1991-2020; UK 1.2°C and 53 days). The heat loss survey sizes the unit for your local design temperature.
- Gas grid. 19% of homes here are off the gas grid (2024 estimate; Great Britain 16%). Homes on oil or LPG with no mains gas can claim £9,000 until 31 March 2027.
- Grant. Boiler Upgrade Scheme grant (£9,000 for off-gas homes on oil or LPG).
Full detail for the region, including planning rules and running costs against gas: air source heat pump cost in Wales.
NIBE S2125 prices in towns across Wales
Other brands in Wales
NIBE S2125 in other regions: London, South East England, South West England, East of England, East Midlands, West Midlands, Yorkshire and the Humber, North West England, North East England, Scotland, Northern Ireland.
Frequently asked questions
How much does a NIBE S2125 heat pump cost in Wales?
NIBE S2125 does not publish an installed price and no credible third-party figure exists, so we show none. For scale, the median Boiler Upgrade Scheme install cost £12,908 before the grant (DESNZ Boiler Upgrade Scheme median, April to June 2026). In Wales a £7,500 grant comes off whatever your installer quotes.
Can I get the grant on a NIBE S2125 heat pump in Wales?
Yes, if your home qualifies: the Boiler Upgrade Scheme is not tied to a brand, as long as the installer is MCS-certified. It comes straight off the quote.
What would a NIBE S2125 heat pump cost to run in Wales?
Roughly £625 a year for the NIBE S2125-12 to deliver 10,000 kWh of heat at 26.55p per kWh (Ofgem price cap for Southern Wales, 1 October to 31 December 2026). That assumes a 45°C design flow temperature, estimated from its MCS-certified SCOPs of 4.8 at 35°C and 3.71 at 55°C. A lower flow temperature, with bigger radiators or underfloor heating, costs less to run.
Who installs NIBE S2125 heat pumps in Wales?
MCS-certified installers across Wales fit NIBE S2125. Ask for a heat loss survey and compare two or three quotes on the same basis: unit size, cylinder, radiator changes and warranty.
Heat pump guides for Wales
Prices, models, efficiency and warranties are indicative and change; confirm with your MCS-certified installer. Climate: Met Office 1991-2020 averages. Energy prices: Ofgem price cap for Southern Wales, 1 October to 31 December 2026.
Where are you?
See indicative costs and local installers for your area