How Much Does a Biomass Boiler Cost in 2026? (UK)
A biomass boiler burns wood — usually pellets, sometimes logs or chips — to heat your home and hot water, and is a genuine low-carbon option for rural, off-gas-grid properties. In 2026 a fully installed automated pellet boiler typically costs £10,000–£19,000, with log batch boilers a little cheaper. That is a big upfront number, but eligible off-grid homes can claim a Boiler Upgrade Scheme grant that takes a substantial chunk off the bill. This guide breaks down the price by type and size, the extras you must budget for, and the running costs.
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How much is a biomass boiler in 2026?
Typical 2026 UK biomass boiler costs, supplied & fitted:
- Log / batch boiler — £7,000–£12,000
- Automated wood pellet boiler — £10,000–£19,000
- Larger pellet system with hopper & buffer tank — £16,000–£25,000
- Boiler Upgrade Scheme grant (eligible off-grid homes) — up to £5,000 off
The price depends on the fuel type and automation, the boiler output your home needs, and the fuel store and flue work. A pellet boiler with automatic feed costs more than a manually loaded log boiler but is far more convenient day to day.
Biomass Boiler Cost by Type
How much you pay — and how much work the boiler needs from you — depends mostly on the fuel and how automated the feed is.
Log / batch boiler — lowest price, most effort
You load seasoned logs by hand and the boiler burns a batch at a time, storing the heat in a buffer tank. The cheapest biomass option and very low fuel cost if you have your own wood, but it needs daily loading and plenty of dry log storage.
Wood pellet boiler — the popular choice
Pellets feed automatically from a hopper or bulk store, so the boiler runs much like a conventional one with only occasional refilling and ash removal. The best balance of convenience and cost, and the type most commonly funded by the Boiler Upgrade Scheme.
Large pellet / chip system — big or multiple properties
Higher-output systems with a bulk hopper, auger feed and large buffer tank suit big farmhouses, multiple buildings or wood chip fuel. Highest upfront cost, but the lowest fuel cost per unit if you buy in bulk.
Extras to Budget For
Fuel store
Pellets and logs need dry, accessible storage close to the boiler. A hopper, bulk store or log shed can add £500–£2,500 depending on size and access.
Flue & buffer tank
A twin-wall insulated flue and a buffer/accumulator tank are usually required, adding to the installed price but essential for efficient, clean burning.
Space & access
Biomass boilers are large. A plant room, outbuilding or garage is often needed, and deliveries require vehicle access for pellet blowing or log drops.
Running & maintenance
Budget for pellet or log fuel, an annual service and periodic ash removal. Fuel cost varies with wood prices, so buying pellets in bulk keeps running costs down.