Heat Pump vs Boiler: What It Means for Gas Engineer Businesses [2026]

Government targets and media attention around heat pumps far exceed actual adoption rates. The data for 2025:

• Heat pump installations: Approximately 100,000–120,000 air source and ground source heat pumps installed in the UK in 2025 — up significantly from 50,000 in 2020 but still only around 6–7% of the total heating installation market
• Gas boiler installations: Approximately 1.6–1.7 million in 2025 — still the dominant heating technology by an enormous margin
• Government target: 600,000 heat pumps per year by 2028. Current trajectory (doubling in 5 years) suggests this target will likely be missed, though growth is genuine
• Boiler Upgrade Scheme uptake: Around 40,000–50,000 grants claimed per year against an allocation of 90,000 — the scheme is underpicked, suggesting demand is not yet where the government hoped

The headline message for gas engineers: the transition is real but much slower than policy rhetoric suggests. Gas boilers will continue to dominate the installed base and replacement market for at least the next 10–15 years.

Several genuine barriers are slowing heat pump adoption in the UK:

• Cost: Even with the £7,500 Boiler Upgrade Scheme grant, an air source heat pump installation costs £7,000–£15,000 installed. A replacement combi boiler costs £1,800–£3,500. The capital cost differential is significant for most homeowners
• Running costs: Heat pump running costs depend heavily on electricity-to-gas price ratios. In the UK, electricity costs approximately 4–5x more per unit than gas. Even with a coefficient of performance (COP) of 3–4 for a well-installed heat pump, running cost parity with gas is marginal at 2026 energy prices
• Installation suitability: Heat pumps work best in well-insulated properties with underfloor heating or larger radiators. Many UK homes — particularly terraced and semi-detached properties with cavity walls and standard radiator systems — are not ideal candidates without additional insulation investment
• Infrastructure: The number of MCS-certified heat pump installers (approximately 3,000–4,000 businesses as of 2025) cannot yet service mass-market demand, even if demand existed at scale

Despite slow adoption, the policy direction is clear. The UK government has committed to:

• No new gas boilers in new build homes under Part L (already in effect for 2025+ builds)
• A proposed phase-out of new gas boiler sales in existing homes (date uncertain; originally 2035, now likely 2030–2035 for the most energy-inefficient properties)
• Clean Heat Market Mechanism — a scheme to effectively require boiler manufacturers to sell a rising proportion of heat pumps alongside boilers (controversial and implementation details still evolving)

For gas engineering businesses, the policy signals are:

• New-build gas installation work will continue declining
• The replacement market (existing properties) will remain largely intact for 10–20 years
• Businesses that add heat pump capability will be positioned for a growing segment; those that don't will progressively lose market share in new builds and eventually in some retrofit segments

The honest assessment for a gas engineering business owner in 2026:

1. Do not panic: The gas boiler replacement market is worth billions per year and will remain so for at least the next decade. Your core business is not under immediate threat
2. Build annual service contract revenue: The most resilient part of gas engineering is recurring maintenance. 24 million boilers all need annual services — this market is independent of any new installation policy
3. Get MCS certified if you want to diversify: Heat pump qualification adds a growing market segment and future-proofs part of your business. The investment (£1,500–£3,000 all-in) recovers quickly once you're installing in the off-gas-grid or eco-conscious market
4. Focus on the existing stock: Servicing, maintaining, and replacing the 24 million gas boilers already installed is a better near-term opportunity than chasing a nascent heat pump market
5. Develop relationships now: Build letting agent, housing association, and commercial relationships that will persist regardless of the technology mix

For gas engineers who do choose to diversify into heat pumps, the opportunity is real — particularly in specific market segments:

• Off-gas-grid properties: Rural properties on oil or LPG heating have no incumbent gas infrastructure to protect. A heat pump is a genuine step-change improvement in running costs at current oil/LPG prices. This is the highest-quality market segment for heat pump sales
• Social housing: Housing associations and local authorities are under the strongest regulatory pressure to decarbonise their heating. Large-scale heat pump retrofit contracts in social housing are a significant opportunity for businesses with the right qualifications and scale
• New build: As Part L mandates heat pump or other low-carbon heating in new builds, gas engineers who become heat pump installers maintain their relevance in the new build market
• Eco-conscious early adopters: A growing segment of homeowners (particularly in London and urban areas) want to decarbonise and will pay a premium to do so, even where the cost-benefit is marginal