NIBE S2125 Air Source Heat Pump Cost in Northern Ireland
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).
No heat pump grant in Northern Ireland.
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 Northern Ireland
Running costs for 10,000 kWh of heat a year at 34.15p per kWh (Power NI standard tariff including VAT, from 1 July 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 | 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 | £815 |
| 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 | £800 |
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 Northern Ireland means for your heat pump
- Climate. January averages 7.2°C by day and 1.7°C at night, with 41 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.
- Heating fuel. 49.5% of Northern Ireland households heat with oil alone, against 31.58% on mains gas alone.
- Grant. No heat pump grant in Northern Ireland.
Full detail for the region, including planning rules and running costs against gas: air source heat pump cost in Northern Ireland.
NIBE S2125 prices in towns across Northern Ireland
Other brands in Northern Ireland
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, Wales.
Frequently asked questions
How much does a NIBE S2125 heat pump cost in Northern Ireland?
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). There is no heat pump grant in Northern Ireland; 0% VAT applies until 31 March 2027.
Can I get the grant on a NIBE S2125 heat pump in Northern Ireland?
There is no heat pump grant for homeowners in Northern Ireland, whichever brand you choose. The 0% VAT relief on the installation still applies.
What would a NIBE S2125 heat pump cost to run in Northern Ireland?
Roughly £800 a year for the NIBE S2125-12 to deliver 10,000 kWh of heat at 34.15p per kWh (Power NI standard tariff including VAT, from 1 July 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 Northern Ireland?
MCS-certified installers across Northern Ireland 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 Northern Ireland
Prices, models, efficiency and warranties are indicative and change; confirm with your MCS-certified installer. Climate: Met Office 1991-2020 averages. Energy prices: Power NI standard tariff including VAT, from 1 July 2026.
Where are you?
See indicative costs and local installers for your area