What Changed in the 2026 UK Warm Homes Plan?
In 2026, the UK Government unveiled the Warm Homes Plan—backed by £2.7 billion in clean heating support—while simultaneously confirming that homeowners with existing gas boilers will not be forced to rip them out when they break down. Instead, the policy focuses on making low-carbon heating financially competitive through the £7,500 Boiler Upgrade Scheme (BUS) voucher and expanding eligibility to emerging technologies such as high-density heat batteries and air-to-air heat pumps.
For homeowners facing an ageing or inefficient boiler this winter, the choice is no longer binary. Whether a high-efficiency A-rated condensing gas combi boiler, an MCS-certified Air Source Heat Pump (ASHP), or a phase-change thermal store is right for your property depends on your insulation levels, radiator pipework diameter, and hot-water demand.
2026 UK Heating System Replacement Costs (Before & After £7,500 Grant)
Verified Market Rates| Job / Service Scope | Typical UK Cost Range | Est. Timeframe | Action |
|---|---|---|---|
| Like-for-Like A-Rated Gas Combi Boiler Swap (Inc. Flue & Filter) | £2,300 – £3,600 (No Grant) | 1 Day | |
| Conventional System Boiler to Combi Conversion (Removing Loft Tanks) | £3,400 – £4,900 (No Grant) | 2 – 3 Days | |
| Air Source Heat Pump Installation (Net Cost After £7,500 BUS Voucher) | £3,800 – £6,500 (Net to Homeowner) | 3 – 5 Days | |
| Air Source Heat Pump Full Gross Cost (Before £7,500 BUS Grant) | £11,300 – £14,000 (Gross) | 3 – 5 Days | |
| Powerflush & Inhibitor Treatment (8–12 Radiators) | £420 – £680 | 4 – 6 Hours | |
| Annual Gas Boiler or Heat Pump Service & Efficiency Check | £85 – £135 | 1 Hour |
Gas Combi Boiler vs. Air Source Heat Pump: How to Decide
When a New A-Rated Gas Combi Boiler Still Makes Sense
If you live in a compact Victorian or Edwardian terrace with 8mm/10mm microbore pipework, no outdoor space for an external unit, and no space indoors for a 200-litre hot water cylinder, a modern modulating gas combi boiler (running at 50°C–55°C flow temperature with OpenTherm smart controls) remains the most cost-effective drop-in upgrade—unless you opt for one of the newly supported compact phase-change heat batteries.
When an Air Source Heat Pump Delivers Lower Bills
If your home has cavity wall insulation, 270mm loft insulation, and space for a cylinder, an MCS-designed heat pump operating at a Seasonal Coefficient of Performance (SCOP) of 3.6 to 4.2+, paired with a smart heat-pump electricity tariff (such as Octopus Cosy or OVO Heat Pump Plus at ~15p/kWh), can cut annual heating bills by £250–£450 per year compared to mains gas—especially once you disconnect the gas meter and eliminate the daily gas standing charge.
2026 Boiler Upgrade Scheme & Heating FAQs
Are gas boilers banned in the UK in 2026?
How do I claim the £7,500 Boiler Upgrade Scheme voucher?
Do I still need an EPC with no loft/cavity insulation recommendations to get the grant?
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