Replacing your heating system is a major home improvement decision. The Boiler Upgrade Scheme helps eligible property owners in England and Wales reduce the upfront cost of qualifying low-carbon heating, but a grant alone does not tell you whether a particular system is right for your property.
Before accepting a quote, use these seven checks to make a more informed decision.
1. Confirm What the Grant Actually Covers
Despite its name, the Boiler Upgrade Scheme (BUS) does not fund a straightforward replacement gas boiler. It supports eligible heat pumps and, in limited circumstances, biomass boilers. In November 2026, standard grant values include £7,500 for an air-to-water or ground source heat pump, £2,500 for an eligible residential air-to-air heat pump, and £5,000 for a qualifying biomass boiler.
Eligible properties without a mains gas connection that currently use oil or LPG heating may receive £9,000 towards an air-to-water or ground source heat pump until 31 March 2027. The higher amount is not a universal grant for every rural home.
2. Check Your Property’s Eligibility
The scheme is for qualifying properties in England and Wales. Property ownership and the heating system being replaced matter. Rental properties, second homes and some business properties may qualify, but social housing and most new-build properties do not. Previous public funding for installing a heat pump or biomass boiler may also affect eligibility.
Ask your installer to check the precise criteria rather than relying on a headline advertisement.
3. Understand Your Home’s Heat Loss
Heat pumps perform best when their output is matched to the heat the building needs. A survey should consider insulation, draughts, windows, room sizes and existing emitters. A house with poor insulation can sometimes still use a heat pump, but the system and operating costs may differ significantly from those in a well-insulated house.
An EPC is not mandatory for BUS applications made from 28 April 2026, though alternative evidence may be needed when there is no valid certificate. That change does not make insulation irrelevant to comfort and performance.
4. Ask About Radiators, Hot Water and Space
Do you have enough space for an outdoor unit? Will existing radiators deliver enough heat at the proposed water temperature? Is a new hot-water cylinder needed? These practical issues can affect the scope and price of the installation.
Ask the installer to identify any electrical work, pipework changes or planning considerations in writing.
5. Compare Total Costs, Not Only Grant Amounts
A typical quotation may combine the heat pump, installation labour, electrical changes, controls, a cylinder, radiators and commissioning. Make sure the grant is clearly deducted from the quoted price.
For illustration only, a £13,000 eligible installation minus a £7,500 grant leaves a £5,500 balance. Your actual price could be higher or lower; the grant is not a promise that the remaining work is free.
6. Choose an MCS-Certified Installer
BUS is an installer-led scheme. Your Microgeneration Certification Scheme (MCS)-certified installer makes the voucher application to Ofgem on your behalf. Ofgem contacts you to confirm that the installer has permission to act for you.
It is sensible to obtain more than one detailed quote, check the proposed design, ask about warranties and confirm who handles any follow-up issues.
7. Assess Future Running Costs
A heat pump can use electricity efficiently, but household bills depend on electricity and fuel prices, insulation, heating patterns, system efficiency and tariffs. Ask for a realistic running-cost estimate based on your home rather than a generic claim of guaranteed savings.
For practical guidance on next steps, explore the boiler upgrade scheme information from Berks Insulation and arrange an eligibility and installation discussion.
Frequently Asked Questions
Can I use the grant for a new gas boiler?
No. BUS supports qualifying low-carbon systems, not a replacement fossil-fuel gas boiler.
Does the grant go into my bank account?
No. The approved value is shown as an upfront discount on the installer’s quote and invoice.
Should I improve insulation before installing a heat pump?
You should discuss it during the survey. Insulation improvements can reduce heat demand, but the ideal sequence depends on the property.
Final Thoughts
A successful heating upgrade is about eligibility, good system design and a transparent final price. Use this checklist to compare offers and avoid surprises before work begins.
