A Bosch Compress heat pump costs roughly two-thirds less to run than a gas boiler in 2026, according to Ofgem price-cap data
A Bosch Compress air-source heat pump can cut your heating bill by about two-thirds compared to a gas boiler under the January 2026 price cap. Based on a typical 3-bed semi-detached home with a 12,000 kWh annual heat demand, a Bosch Compress with a Seasonal Coefficient of Performance (SCOP) of 3.2 costs around £918.75 per year to run. A 90% efficient gas boiler costs roughly £800.00 for the same heat output. The actual saving depends on your home’s insulation and the system’s SCOP, but a well-installed Bosch Compress can save you roughly £118 annually against a gas boiler.
The Bosch Compress 7000i AW delivers a seasonal COP between 3.0 and 3.6 in UK climates
The Bosch Compress 7000i AW, the flagship air-to-water model for UK homes, has a declared SCOP range of 3.0 to 3.6 across its 5 kW, 8 kW and 12 kW variants (MCS Product Database, 2026). The SCOP tells you how many units of heat the pump produces for each unit of electricity it consumes. A SCOP of 3.0 means it generates 3 kWh of heat for every 1 kWh of electricity used. The actual SCOP you get depends on the model size and the flow temperature you set. Lower flow temperatures, typical of underfloor heating or oversized radiators, push the SCOP towards the higher end of the range.
Quick numbers noise, warranty, and refrigerant type for the 2026 range
The table below summarises the key specifications for the Bosch Compress 7000i AW models available in 2026. All figures are taken from Bosch Home Comfort UK product specifications and the MCS database (Bosch Home Comfort UK, 2026).
| Model | Outdoor unit sound power level | Warranty (years) | Refrigerant | Max flow temperature (°C) |
|---|---|---|---|---|
| Compress 7000i AW 5 kW | ~58 dB(A) | 5 (standard) | R32 | 75 |
| Compress 7000i AW 8 kW | ~60 dB(A) | 5 (extendable) | R32 | 75 |
| Compress 7000i AW 12 kW | ~62 dB(A) | 5 (extendable) | R32 | 75 |
Who qualifies for the £7,500 BUS grant when installing a Bosch Compress in 2026
Homeowners in England and Wales who own their property and are replacing a fossil fuel heating system (gas, oil, LPG or direct electric) with a certified heat pump like a Bosch Compress qualify for the £7,500 Boiler Upgrade Scheme (BUS) grant in 2026 (GOV.UK, Boiler Upgrade Scheme, 2026). The installer applies the grant to your invoice, not you. Your property must have a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation, unless an exemption applies. Landlords and new-build properties cannot claim the BUS.
How to verify a Bosch Compress installer is MCS-certified and TrustMark-registered
To claim the BUS grant, your installer must be certified under the Microgeneration Certification Scheme (MCS) (MCS, 2026). Ask the installer for their MCS certificate number and check it on the public MCS register online. TrustMark registration is also required for the BUS. Gas Safe Register registration is irrelevant for heat pump installation, though your installer may hold it for separate gas work. Get at least three quotes from MCS-certified installers before you commit.
The Bosch Compress range includes models for both air-to-air and air-to-water systems
The Bosch Compress name covers both air-source heat pumps for radiators and underfloor heating (the 7000i AW air-to-water models) and air-to-air models like the Compress 5800i for ducted systems (Bosch Home Comfort UK, 2026). The vast majority of UK domestic installations are air-to-water, which is the focus of this review. The air-to-water models work with existing radiator systems, but you may need larger radiators to run at the lower flow temperatures that give the best efficiency.
Running costs for a Bosch Compress heat pump versus a gas boiler in a typical 2026 home
Using the January 2026 price cap figures of 24.5p/kWh for electricity and 6.0p/kWh for gas (Ofgem, 2026), here is the detailed cost comparison for a typical 3-bed semi-detached home with a 12,000 kWh annual heat demand.
Bosch Compress heat pump (SCOP 3.2):
(12,000 kWh / 3.2) x 24.5p/kWh = £918.75 per year.
Gas boiler (90% efficient):
(12,000 kWh / 0.90) x 6.0p/kWh = £800.00 per year.
The heat pump is cheaper only if the SCOP stays high. A poorly insulated home or a system set to a 65°C flow temperature will lower the SCOP and increase running costs. In a well-insulated home with a SCOP of 3.2, the Bosch Compress saves roughly £118 per year against a gas boiler in 2026.
How to improve your home's insulation for a heat pump
Boiler Upgrade Scheme grant eligibility checklist
Frequently Asked Questions
A Bosch Compress heat pump costs roughly £919 per year to run for a typical 3-bed semi-detached home with a 12,000 kWh heat demand, based on the January 2026 Ofgem price cap.
The Bosch Compress 7000i AW has a declared SCOP range of 3.0 to 3.6 across its 5 kW, 8 kW and 12 kW variants, according to the MCS Product Database (2026).
The outdoor unit sound power level is approximately 58 dB(A) for the 5 kW model, 60 dB(A) for the 8 kW model, and 62 dB(A) for the 12 kW model, per Bosch Home Comfort UK specifications.
Bosch offers a standard 5-year warranty on the Compress 7000i AW range, which can be extended on most models, as stated by Bosch Home Comfort UK (2026).
The Bosch Compress 7000i AW uses R32 refrigerant, which has a lower global warming potential than older refrigerants like R410A, according to Bosch Home Comfort UK.
