A biomass boiler installer is an MCS certified and HETAS registered engineer who installs wood fuel heating systems for homes and commercial buildings. Biomass boilers burn wood pellets, wood chips or logs to produce heat for central heating and hot water. They are particularly suited to off-gas-grid rural properties as an alternative to oil or LPG. MCS certification is mandatory for the £5,000 Boiler Upgrade Scheme grant; HETAS registration enables the installer to self-certify the installation under Building Regulations. Large biomass boilers also require formal flue design and HETAS approval of the complete heating system.
What they do
- Site survey and fuel storage assessment
- Boiler sizing and specification
- Fuel delivery route and store design
- Boiler and accumulator tank installation
- Flue design and installation
- MCS certificate issue and BUS grant application
- HETAS self-certification of the heating installation
- Annual service and combustion analysis
When you need one
A biomass boiler installer is needed when you want to replace oil, LPG or electric heating with a renewable wood fuel system, particularly on rural off-gas-grid properties.
Typical costs (UK, 2025)
| Job type | Typical cost |
|---|---|
| Wood pellet boiler 15kW (supply and install) | £10,000 - £18,000 |
| Wood chip boiler (larger properties) | £15,000 - £30,000+ |
| Log gasification boiler (supply and install) | £8,000 - £15,000 |
| BUS grant deduction | -£5,000 |
| Fuel store construction | £1,000 - £4,000 |
| Annual service | £200 - £400 |
Costs vary significantly by boiler size, fuel type, flue specification and fuel store requirements. Always obtain at least two MCS certified quotes.
Qualifications to look for
MCS certification is mandatory for biomass boiler installers whose customers wish to claim the £5,000 Boiler Upgrade Scheme grant. Verify at mcscertified.com before appointing.
HETAS is the official government-recognised body for the solid fuel and biomass heating industry. HETAS registration allows installers to self-certify biomass heating installations under Building Regulations without separate Building Control approval.
City and Guilds biomass heating qualifications cover boiler selection, installation, flue design and commissioning. Often held alongside HETAS and MCS registration.
How to find a reputable biomass boiler installer
Frequently asked questions
What is HETAS?
The official government-recognised body for the solid fuel and biomass heating industry in the UK. HETAS registered installers are competent to self-certify solid fuel and biomass heating installations under Building Regulations.
What fuel does a biomass boiler use?
Wood pellets are the most convenient - automatically fed from a hopper. Wood chips require more storage space and a wetter fuel. Log gasification boilers are manually loaded and work best with seasoned logs at under 20% moisture content.
Does biomass count as renewable energy?
Yes - under UK policy biomass is considered renewable if the wood is sustainably sourced. The carbon released when burning is considered to be re-absorbed by growing replacement trees.