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Install a biomass boiler.
Wood-pellet or log biomass boiler — for off-grid homes. £5,000 BUS grant available.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Storage required
Pellets need 1+ ton storage. Chips need 5+ ton. Significant space needed.
Pellet quality variation
Cheap pellets clog auger. Always quality A1 grade.
Less popular than ASHP
ASHP getting more grant attention. Biomass for off-grid rural primarily.
Annual service mandatory
Complex system with auger, burner, control board. Skipping service voids warranty.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Pellet boiler 15kWDomestic standard
£14k–£22k
Chip boiler 20kW (larger farms)Rural property
£20k–£35k
Pellet hopper/silo (1 ton)External storage
£2.5k–£4.5k
Chip silo (5 tons)Large rural homes
£3.5k–£6.5k
Net cost after grantVariable
£13k–£30k
Annual pellet cost (typical home)3-4 tons/year
£800–£1.5k
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Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Biomass boilers burn wood pellets or chips for whole-house heating. Carbon-neutral cycle. £5,000 BUS grant. Expect to pay £18,000–£35,000 for UK biomass installation.
What Does the Work Involve?
MCS-certified installer surveys system. Boiler unit (basement, utility, or outdoor enclosure). Pellet hopper or chip silo (silo holds tons of pellets, auger-fed to boiler). Flue (often integrated). Buffer tank (water storage). Smart controls. Manual or automatic ash collection.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Pellet boiler 15kW | 14,000 | 22,000 | Domestic standard |
| Chip boiler 20kW (larger farms) | 20,000 | 35,000 | Rural property |
| Pellet hopper/silo (1 ton) | 2,500 | 4,500 | External storage |
| Chip silo (5 tons) | 3,500 | 6,500 | Large rural homes |
| BUS grant biomass | -5,000 | -5,000 | Government rebate |
| Net cost after grant | 13,000 | 30,000 | Variable |
| Annual pellet cost (typical home) | £800 | £1,500 | 3-4 tons/year |
How Long Does It Take?
Install: 1–2 weeks. Plus silo/hopper installation and ground works.
DIY or Professional?
MCS-certified specialist only. HETAS-trained for flue.
Choosing the Right Tradesperson
MCS-certified biomass installer. Brands: Windhager (Austrian), Froling, KWB. UK distributor support important.
UK Regulations
MCS for grant. Building Regs Part J, Part L, Part P. Smoke control areas: DEFRA-approved boiler required (most modern are).
Common Problems
- Storage required: Pellets need 1+ ton storage. Chips need 5+ ton. Significant space needed.
- Pellet quality variation: Cheap pellets clog auger. Always quality A1 grade.
- Less popular than ASHP: ASHP getting more grant attention. Biomass for off-grid rural primarily.
- Annual service mandatory: Complex system with auger, burner, control board. Skipping service voids warranty.
Frequently Asked Questions
Biomass or ASHP?
Biomass: better for large rural off-grid properties. ASHP: better for urban/suburban smaller homes. Biomass £5,000 BUS; ASHP £7,500. ASHP usually preferred.
Pellet vs chip boiler?
Pellet: cleaner burn, smaller storage. Chip: cheaper fuel, larger storage. Chip for rural, pellet for typical home.
How much fuel?
Typical 3-bed home: 3-4 tons pellets/year (£800-£1,500). 4+ bed rural: 5-7 tons (£1,200-£2,500).
Running cost vs gas?
Biomass running cost similar to mains gas. Cheaper than oil or LPG. With BUS grant, payback 8-12 years.
Annual maintenance?
£300-£600 annual service. Specialist required. Ash emptying weekly/fortnightly.
How long does biomass last?
15-20 years. Some quality boilers 25+ years with maintenance.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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