How Much Does a Biomass Boiler Cost in 2026?
A biomass boiler costs £10,000 to £19,000 fully installed. With the £5,000 BUS grant, a pellet boiler could cost from £7,000. Biomass suits rural, off-grid properties with space for fuel storage. Running costs are genuinely low. The honest downside? The space it needs and the maintenance involved.
£15,000
Pellet boiler installed
£10,000
After BUS grant
£950
Annual running cost
4-6p
Cost per kWh
Prices updated April 2026 · Based on industry data and contractor submissions.
MCS-certified installers required for BUS grant. To qualify for the £5,000 Boiler Upgrade Scheme grant, your biomass boiler must be installed by a Microgeneration Certification Scheme (MCS) certified installer. Even without the grant, using an MCS installer ensures the work meets quality standards. The boiler itself must also be MCS-approved.
Biomass Boiler Prices at a Glance
All installation prices below include the boiler, flue system, basic fuel storage, commissioning, and labour. Pellet boiler prices are shown before and after the BUS grant.
| System | Price Range | Average |
|---|---|---|
| Automatic pellet boiler (fully installed) | £12,000 - £19,000 | £15,000 |
| Log batch boiler (fully installed) | £10,000 - £15,000 | £12,000 |
| Pellet boiler (after BUS grant) | £7,000 - £14,000 | £10,000 |
| Pellet storage hopper | £800 - £2,000 | £1,200 |
| Annual pellet fuel cost (3-bed home) | £800 - £1,200 | £950 |
| Annual servicing | £150 - £250 | £200 |
Prices include supply, installation, flue, and commissioning. BUS grant applied where indicated.
Biomass Boiler Prices by Brand
Biomass boilers are specialist kit. The main manufacturers are Austrian and German. Here is what the leading brands cost fully installed in the UK.
| Brand | Price Installed |
|---|---|
| Windhager | £14,000 - £19,000 |
| Froling | £13,000 - £18,000 |
| Grant | £10,000 - £15,000 |
| ETA | £13,000 - £17,000 |
| Viessmann | £14,000 - £18,000 |
Prices before BUS grant. See our main boiler cost guide for gas and oil boiler comparisons.
What Affects the Cost of a Biomass Boiler?
Pellet vs log boiler
Automatic pellet boilers cost more (£12,000 to £19,000) because they include a motorised feed system that moves pellets from hopper to combustion chamber. Log batch boilers are cheaper (£10,000 to £15,000) but you are loading them by hand, twice a day in winter. Most homeowners go for pellets. The convenience is worth the extra spend.
Fuel storage requirements
This is the honest downside of biomass. A pellet hopper takes up roughly the space of a large wardrobe. A log store needs a dry shed or covered area. If you need to build a fuel store from scratch, add £1,000 to £3,000. Properties with existing outbuildings have a real advantage here.
Flue and chimney work
Biomass boilers need a proper chimney or twin-wall flue system, which is more involved than a standard gas or oil flue. A new twin-wall flue through the roof typically adds £800 to £1,500. If you have an existing chimney in the right spot, the cost drops significantly.
Property size and heat demand
Biomass boilers range from around 15kW for a small cottage up to 50kW or more for large farmhouses. Bigger boiler, higher cost. Getting the sizing right matters: an oversized boiler wastes fuel, while an undersized one will not keep up in cold weather.
Access and delivery
Biomass boilers are physically large and heavy. If your plant room has awkward access, the installation team may need a crane or specialist lifting gear, which adds to the cost. In practice, ongoing fuel deliveries also need good vehicle access, so think about this when choosing where to put the boiler and fuel store.
Buffer tank and accumulator
Most biomass systems need a buffer tank (basically a large hot water cylinder) to store heat and stop the boiler short-cycling. This is typically included in the quote, but a larger accumulator tank for greater heat storage adds £500 to £1,500.
Biomass Boiler Running Costs
This is where biomass earns its keep. Wood pellets cost roughly 4 to 6p per kWh, making biomass one of the cheapest ways to heat a home. The high upfront cost stings, but the fuel bills year after year are genuinely low.
Biomass (wood pellets)
~£950/year for a typical 3-bed home
Mains gas
~£900/year for the same house
Heating oil
~£1,400/year for the same house
LPG
~£1,700/year for the same house
Annual saving vs oil: £300 to £600
Switching from oil to biomass typically saves £300 to £600 a year on fuel. Compared to LPG, the savings are bigger still at £500 to £800 per year. Over a 20-year boiler life, that adds up to £6,000 to £16,000. Goes a long way towards paying back the higher installation cost.
Payback period: 8 to 15 years
With the BUS grant bringing the net cost to around £10,000, and fuel savings of £400 to £700 a year vs oil or LPG, the payback period is roughly 8 to 15 years. Depends on your current fuel costs. Biomass boilers last 20 to 25 years with proper maintenance, so the numbers do work out long term.
Log boilers can be even cheaper. If you have access to free or cheap wood, a log batch boiler can bring running costs down to almost nothing. The tradeoff is manual loading twice a day and more frequent ash removal. But for rural properties with woodland or good firewood contacts, the fuel cost savings are substantial.
Biomass Boiler Prices by Region
Biomass installations are most common in rural areas, particularly the South West, Wales, Scotland, and Northern Ireland. Areas with more MCS installers tend to have keener pricing.
| Region | Average Cost | vs National |
|---|---|---|
| London and South East | £17,500 | +17% |
| South West | £15,800 | +5% |
| East of England | £15,500 | +3% |
| Midlands | £15,000 | Average |
| Yorkshire | £14,200 | -5% |
| North West | £14,000 | -7% |
| North East | £13,800 | -8% |
| Scotland | £14,500 | -3% |
| Wales | £14,200 | -5% |
| Northern Ireland | £14,000 | -7% |
Based on industry data. Prices for automatic pellet boiler installation before BUS grant.
How to Get Your Biomass Boiler for Less
Biomass is a big investment upfront. But between the BUS grant and a few smart choices, you can bring the cost down and benefit from low running costs for decades.
Claim the £5,000 BUS grant
The Boiler Upgrade Scheme gives £5,000 towards a biomass boiler for off-grid rural homes. Your installer handles the application, but the system must be fitted by an MCS-certified installer to qualify. That £5,000 knocks a serious chunk off the upfront cost. Check eligibility at gov.uk.
Buy pellets in bulk during summer
Wood pellet prices are lowest in late spring and summer when demand drops. A full pallet of pellets (roughly a tonne) costs noticeably less per bag than buying a few bags at a time. If you have the storage space, buying a year's supply in one go can save 15 to 20% on your annual fuel costs.
Get at least three quotes from MCS installers
Biomass installation is specialist work, and prices can vary by several thousand pounds between installers. Always compare at least three quotes from MCS-certified installers. Make sure each quote includes the boiler, flue, fuel storage, commissioning, and the BUS grant application.
Consider a log boiler if you have free wood
If you have access to free or cheap wood (your own land, a local tree surgeon, or a firewood contact), a log batch boiler can bring your running costs to almost nothing. The tradeoff is manual loading twice a day in winter and more ash. But for the right rural property, the savings are hard to argue with.
Install during spring or summer
Biomass installations take several days and involve significant disruption. Getting it done in warmer months means you are not rushing to get heating back on, and MCS installers tend to have more availability outside of the October to March rush. You may also find better prices.
Insulate your home first
This applies to any heating system, but it is especially important with biomass because the boiler and fuel storage take up so much space and money. A well-insulated home needs a smaller boiler and burns less fuel. Spending £2,000 on loft and cavity wall insulation before installing biomass could mean you need a smaller, cheaper boiler and save hundreds a year on pellets.
Boiler Upgrade Scheme: £5,000 for biomass
The government's Boiler Upgrade Scheme offers a £5,000 grant towards a biomass boiler for off-grid rural properties. Worth noting that heat pumps get a larger £7,500 grant, so get biomass and heat pump quotes side by side before deciding. Both have their pros and cons depending on your property and lifestyle.
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Try the CalculatorWhat to Expect: The Biomass Boiler Installation Process
A biomass boiler installation is a major project, typically taking 3 to 5 days on site plus preparation time. Here's how it works.
- 1
Site survey and feasibility assessment
An MCS-certified installer surveys the property, checks available space for the boiler and fuel storage, assesses the flue route, and confirms the heat demand. A biomass boiler needs a dedicated plant room and dry fuel store, so space planning is essential.
- 2
Fuel storage and delivery access prepared
A fuel store is built or adapted to hold wood pellets or logs, with delivery access for a blower truck (pellets) or stacking area (logs). The store must be dry, ventilated, and large enough to hold several weeks’ supply.
- 3
Flue and chimney installation
A twin-wall insulated flue system is installed, typically rising through the roof or externally up the side of the building. The flue must meet Building Regulations Part J and be tall enough to ensure proper draught for clean combustion.
- 4
Boiler installed and connected
The biomass boiler is positioned in the plant room, connected to the heating circuits and a thermal store (buffer tank). An automatic pellet feed system is fitted if applicable. The system is filled, pressurised, and leak-tested.
- 5
Commissioning and MCS certification
The installer commissions the boiler, adjusts combustion settings, and runs through a full heating cycle. The installation is registered under MCS, which is required to claim the Boiler Upgrade Scheme grant of £5,000.
Frequently Asked Questions
How much does a biomass boiler cost to install?
A biomass boiler costs between £10,000 and £19,000 fully installed in 2026. Automatic pellet boilers are at the higher end (£12,000 to £19,000) because of the pellet feed system, while log batch boilers are cheaper at £10,000 to £15,000 but need manual loading. After the £5,000 Boiler Upgrade Scheme grant, a pellet boiler could cost as little as £7,000.
Can I get a grant for a biomass boiler?
Yes. The Boiler Upgrade Scheme offers a £5,000 grant towards a biomass boiler for properties in rural areas that are not connected to the gas grid. The installation must be carried out by an MCS-certified installer. The old Renewable Heat Incentive (RHI) has ended and been replaced by the BUS grant.
How much does it cost to run a biomass boiler?
Wood pellets cost roughly 4 to 6p per kWh, making annual heating costs for a typical 3-bedroom home around £800 to £1,200. That is cheaper than oil (£1,200 to £1,800) and significantly cheaper than LPG (£1,400 to £2,000). You also need to budget £150 to £250 per year for servicing.
How much space does a biomass boiler need?
The honest downside of biomass is the space it needs. The boiler itself is larger than a gas or oil boiler, and you also need room for fuel storage. A pellet hopper takes up roughly the same space as a large wardrobe, while a log store needs a dry outbuilding or covered area. Most biomass systems need a dedicated plant room or outbuilding.
What maintenance does a biomass boiler need?
Biomass boilers need more maintenance than gas or oil. Pellet boilers need ash emptying roughly once a week, while log boilers need daily ash removal during winter. The combustion chamber needs cleaning every few weeks. Annual servicing by a qualified engineer costs £150 to £250. Modern pellet boilers with automatic de-ashing systems reduce the manual work significantly.
Written by James Carter, Less.co.uk energy specialist
Last updated: · Pricing based on industry data and verified contractor submissions · Methodology
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