Last updated: February 16, 2026 | By Evolving Home Team

Heat Pumps in the UK: Costs, Savings & the BUS Grant (2026)

Heat pumps are 3-4x more efficient than gas boilers, but cost £8,000-£15,000 to install (after £7,500 BUS grant). They work best in well-insulated homes with underfloor heating or oversized radiators. Here's an honest assessment of whether a heat pump is right for you.

💡 Key Insight

Heat pumps are highly efficient but require good insulation and appropriate radiators. For most UK homes, they're most cost-effective when replacing oil, LPG, or electric heating— not gas boilers (unless electricity prices fall significantly or you have solar panels).

What is a Heat Pump?

A heat pump extracts heat from the outside air (ASHP) or ground (GSHP) and transfers it into your home. Think of it as a refrigerator in reverse—it moves heat rather than creating it.

Key advantage: For every 1 kWh of electricity used, a heat pump delivers 3-4 kWh of heat. Gas boilers only deliver 0.85-0.92 kWh per kWh of gas.

Types of Heat Pumps

Feature	Air Source (ASHP)	Ground Source (GSHP)
Installation Cost	£8,000-£12,000	£14,000-£20,000
BUS Grant	£7,500	£7,500
Net Cost	£500-£4,500	£6,500-£12,500
Efficiency (SCOP)	3.0-3.5	3.5-4.5
Installation Time	2-3 days	5-7 days + groundworks
Space Required	Outdoor unit (1m²)	Garden (100-200m²) or borehole
Noise Level	40-50 dB (outdoor fan)	Very quiet
Best For	Most UK homes	Large gardens, new builds

SCOP Explained

SCOP (Seasonal Coefficient of Performance) measures heat pump efficiency over a full heating season. It's the ratio of heat output to electricity input.

SCOP 3.0: For every 1 kWh of electricity, you get 3 kWh of heat
SCOP 3.5: For every 1 kWh of electricity, you get 3.5 kWh of heat
SCOP 4.0+: For every 1 kWh of electricity, you get 4+ kWh of heat

Compare this to gas boilers (efficiency 85-92%) which produce less than 1 kWh of heat per kWh of gas. Heat pumps are fundamentally more efficient.

⚠️ The Catch

Electricity costs 3-4x more per kWh than gas in the UK (27p vs 7p). So even though heat pumps are 3-4x more efficient, your heating costs may be similar or slightly higher than a gas boiler—unless you have solar panels or electricity prices fall.

Realistic Costs (2026)

Air Source Heat Pump (ASHP)

Heat pump unit: £3,000-£5,000
Hot water cylinder: £800-£1,200 (if needed)
Installation labour: £2,000-£3,500
Radiator upgrades: £1,000-£2,500 (often required)
Electrical upgrades: £500-£1,000 (if needed)
Total: £8,000-£12,000
BUS Grant: -£7,500
Net Cost: £500-£4,500

Ground Source Heat Pump (GSHP)

Heat pump unit: £6,000-£8,000
Ground loop installation: £5,000-£8,000
Hot water cylinder: £800-£1,200
Installation labour: £2,000-£3,000
Additional costs: £1,000-£2,000
Total: £14,000-£20,000
BUS Grant: -£7,500
Net Cost: £6,500-£12,500

The Boiler Upgrade Scheme (BUS)

The UK government's Boiler Upgrade Scheme (BUS) provides grants for low-carbon heating systems:

Air source heat pumps: £7,500 grant
Ground source heat pumps: £7,500 grant
Biomass boilers: £5,000 grant (less common)

BUS Eligibility Requirements

Property must be in England or Wales (Scotland has separate schemes)
Must replace fossil fuel heating (gas, oil, LPG, electric)
Installer must be MCS certified
EPC must be valid (less than 10 years old)
No outstanding EPC recommendations for loft or cavity wall insulation
Heat pump must meet minimum SCOP requirements (2.8 for ASHP, 2.5 for GSHP)

The BUS scheme is currently funded until 2028, but budgets are limited. Apply early to secure funding.

Check Your Heat Pump Suitability

Enter your address to see if your home is suitable for a heat pump, estimated costs after the BUS grant, potential savings, and MCS-certified installers in your area.

Real-World Savings: The Honest Take

Heat pump running costs depend heavily on your current heating system, insulation, and electricity tariff:

Replacing Oil or LPG Heating

Expected savings: £500-£1,200/year
Oil and LPG are expensive (12-15p/kWh equivalent). Even with higher electricity prices, heat pumps typically save money.

Replacing Old Electric Storage Heaters

Expected savings: £600-£1,000/year
Direct electric heating is expensive. Heat pumps are 3x more efficient, delivering substantial savings.

Replacing Modern Gas Boiler

Expected savings: £0-£200/year (possibly higher costs)
This is where heat pumps struggle financially. Gas is cheap (7p/kWh), and even with 3x efficiency, electricity at 27p/kWh means similar or slightly higher costs.

Heating System	Annual Cost (Typical Home)	vs Heat Pump
Oil boiler	£1,800-£2,200	Save £600-£900
LPG boiler	£1,700-£2,000	Save £500-£700
Electric storage heaters	£1,900-£2,400	Save £600-£1,000
Modern gas boiler	£1,100-£1,400	±£0-£200
Heat pump (ASHP SCOP 3.2)	£1,200-£1,500	—

Based on typical 3-bed semi-detached home with 12,000 kWh annual heat demand. Electricity at 27p/kWh, gas at 7p/kWh, oil at 12p/kWh equivalent (2026 prices).

When Heat Pumps Make Sense

Heat pumps are a good investment when:

Replacing oil, LPG, or electric heating: Clear financial savings
Off-gas grid: No mains gas connection available
Well-insulated home: EPC Band C or better
Underfloor heating or oversized radiators: Works with lower flow temperatures
New build or major renovation: Cost-effective to design for heat pumps
Solar panels installed: Reduces electricity costs significantly
Environmental priority: Willing to pay slightly more for lower carbon
Long-term planning: Gas prices may rise, electricity may fall

When Heat Pumps Don't Make Sense

Heat pumps may not be suitable if:

Modern gas boiler + poor insulation: Fix insulation first
Small radiators: Expensive upgrades required (£1,000-£2,500)
Listed building: Planning restrictions on external units
No outdoor space: Nowhere to install external unit (ASHP)
Tight budget: Even with BUS grant, upfront costs remain significant
Short-term occupancy: Payback period may exceed time in property

Heat Pump Installation Requirements

Insulation

Heat pumps work best with good insulation (EPC Band C or better). Before installing a heat pump, ensure you have:

Loft insulation (270mm minimum)
Cavity wall insulation (if applicable)
Double glazing
Draught proofing

Radiators

Heat pumps operate at lower temperatures (45-55°C) than gas boilers (60-80°C). You may need to upgrade radiators to larger models or add additional radiators.

Hot Water Cylinder

Most heat pumps require a hot water cylinder (200-300L). If you currently have a combi boiler, this is an additional cost and space requirement.

Electrical Supply

Heat pumps draw 3-5 kW. Your electrical system must support this load. Some homes require consumer unit upgrades (£500-£1,000).

Finding MCS-Certified Installers

MCS (Microgeneration Certification Scheme) accreditation is mandatory for BUS grant eligibility. To find installers:

MCS Certified Installer Database: mcscertified.com
Get 3+ quotes: Compare costs, equipment, and warranties
Check reviews: Look for Trustpilot, Google reviews, case studies
Ask about SCOP: Ensure quoted system meets minimum standards
Warranty coverage: Minimum 5 years on heat pump, 2 years on installation

Heat Pump Performance in Cold Weather

Common myth: "Heat pumps don't work in cold UK winters."
Reality: Modern heat pumps operate efficiently down to -15°C to -25°C. UK winter temperatures rarely drop below -5°C, so performance is not a concern.

However, efficiency does decrease in colder weather. A heat pump with SCOP 3.5 may achieve SCOP 4.0+ in mild weather but drop to SCOP 2.5-3.0 in freezing conditions.

Carbon Savings

Heat pumps reduce carbon emissions compared to fossil fuel heating:

vs Gas boiler: 30-50% CO2 reduction (UK grid mix)
vs Oil boiler: 50-70% CO2 reduction
vs LPG boiler: 50-70% CO2 reduction
With solar panels: 80-90% CO2 reduction

As the UK grid decarbonizes (more renewables, less gas), heat pump carbon benefits will increase over time.

Payback Period Calculation

Example: Replacing Oil Boiler with ASHP

Installation cost: £10,000
BUS grant: -£7,500
Net cost: £2,500
Annual heating savings: £700
Payback period: 3.6 years

Example: Replacing Gas Boiler with ASHP

Installation cost: £10,000
BUS grant: -£7,500
Net cost: £2,500
Annual heating savings: £0-£100 (possibly higher costs)
Payback period: 25+ years (or never)
* Unless you have solar panels or electricity prices fall

Future-Proofing Your Home

Even if heat pumps don't save money today vs gas boilers, future changes may shift the economics:

Rising gas prices: Gas levy expected to fund grid upgrades
Falling electricity costs: Renewable energy becoming cheaper
Carbon pricing: Fossil fuels may become more expensive
Hydrogen uncertainty: Hydrogen boilers still unproven at scale
Building regulations: Future homes standard may mandate heat pumps

Get Your Heat Pump Cost Estimate

See personalized heat pump costs, savings, BUS grant eligibility, and ROI analysis for your specific property and current heating system.

Next Steps

Check insulation: Ensure EPC Band C or better before considering heat pumps
Get heat loss survey: Determine required heat pump size
Request MCS quotes: Compare 3+ certified installers
Apply for BUS grant: Installer typically handles application
Plan radiator upgrades: Budget for larger radiators if needed
Consider solar: Maximizes heat pump cost-effectiveness