What Does Biomass Mean?
Biomass is biological material derived from living or recently living organisms such as plants or plant-derived materials. It can be used directly with boilers via combustion to produce the heat, or indirectly, after converting it to various forms of fuel. The largest biomass energy source is wood in the form of logs, pellets or wood chips.
The full range of biomass fuels also includes animal, food, industrial, and municipal waste. Biomass can be transformed into various forms of energy, such as methane gas, ethanol and bio-diesel. Burning biomass releases most of the energy as heat that can be utilised to heat homes, generate electricity, or as a fuel for vehicles.
Unlike coal, which can take millions of years to form, biomass is relatively environmentally friendly and sustainable. It can be obtained very quickly by replacing or growing new plants or trees. Biomass is also known as a carbon neutral form of energy because plants absorb as much carbon dioxide from the air when they grow, as they release during the burning process. It supplies us not only with the energy but also reduces waste we would otherwise need to dispose of.
Biomass is one of the most popular fuels for boilers. Other fuel alternatives are gas boilers, electric boilers, or oil-fired.
If you're considering to install a biomass boiler or any other kind, you just have to fill in the form on the right, and you'll receive quotes from boiler suppliers. It's quick, easy and free.
Green Homes Grant Extended Until 2022
The Green Homes Grant, which provides homeowners and landlords with £5,000 - £10,000 vouchers for energy-saving renovations, has been extended for a year until 31 March 2022.
Biomass boilers are included under the primary measures of the grant scheme.
Read our guide about the Green Homes Grant for full details about how to apply.
Note: the Green Homes Grant is only available in England, and works can continue in all tiers under the current restrictions.
How Does a Biomass Boiler Work?
Wood is not a new type of fuel, but the technology has improved considerably to make it more efficient. Domestic biomass boilers can be a budget saving replacement for gas or oil boilers and provide you with space heating and hot water. Biomass boilers have a 30-50% cost savings on fuel when compared to alternative options. This justifies the higher initial boiler cost as it is a long-term investment.
Biomass boilers work by burning wood pellets or chips in order to generate heat for your home or building. To minimise transport and delivery costs of fuel, manufacturers recommend ordering a year’s supply of fuel. If you cannot provide large storage space, wood pellets can be delivered on pallets of 10 kg bags.
Wood fuel is automatically fed into the boiler from the storage area where an electric probe ignites the material. The produced heat is monitored and controlled by thermostats that adjust both fuel supply and fan speed. The hot gasses produced during the burning process flow to the heat exchanger where the heat is passed into the water used for the heating system. Water circulates through a central heating system while heating the property.
How Much Does a Biomass Boiler Cost?
Like many other ways of producing clean and renewable energy, the biomass boilers also requires an initial investment, which it will be refundable over the years. The costs for a domestic biomass system ranges approximately between £5,000 to £15,000, all inclusive of a 5% VAT, installation, flue and fuel store. The price depends on the fuel used, type and size of the boiler.
With regard to fuel, it is important to mention that not only the different types of fuel influence the final cost, there are other factors to consider. If you have a spacious area to store the fuel, you can keep the cost down by purchasing a larger amount of fuel at once. Furthermore, manually fed log boilers can be a little bit cheaper than the automatic ones.
For example, if you are able to store several tonnes of pellets, in many parts of UK you may spend about £220 per tonne.
As far the Return on Investment is concerned, considering a biomass boiler is quite similar to a printer. Although a printer would seem to be expensive, you must keep in mind the price of the cartridges. Therefore, a biomass system could be expensive at first but it will be cheaper in the long run compared to other heating systems.
What Grants Are There for Biomass Boilers?
As mentioned before you can benefit from the Renewable Heat Incentive (RHI) when considering to install a biomass boiler.
It was set up with the goal of encouraging people to install different types of renewable sources of energy among householders, communities and companies by offering them financial incentives.
It is the first in the world of its kind and the UK Government expects it to reach at least 12% of heat generation coming from renewable energy sources by 2020. The domestic renewable heat incentive was launched in April 2014, covering England, Wales and Scotland.
Which Wood Fuel Is the Best for Biomass Boilers?
Wood fuels will need more storage space as compared to fossil fuels (oil or LPG). The most frequently used types of wood fuels are logs, wood chips and wood pellets. There are many benefits to wood chip or pellet boilers.
While wood chips and pellets are commonly used in automated systems, logs are dependent on human input and they must be manually fed into the boiler. If the wood contains too much moisture or is not adequately seasoned, smoke and tar will be formed during the burning process.
Wood pellets are composed of compressed sawdust and wood shavings. They are 100% natural, renewable and easy to use. Their energy content is higher than logs or wood chips so they have a higher energy content and do not require large storage space. Wood pellet systems are small and require minimal input from the user.
Wood chips are a solid material made by cutting larger pieces of wood. The advantage of wood chips is low cost, but their efficiency cannot reach a high level such as wood pellets. Wood chips require less energy for manufacturing, processing and transportation as compared to other wood fuels. In addition, when harvested through sustainable forestry practices, wood chips are viewed as a renewable energy source.
Before investing in a biomass boiler, it is important to think carefully about storage space, supply and handling of fuel. To maximise the efficiency of your equipment, it is essential to choose the right type of fuel and get the moisture content of the fuel right. Wood chips and logs will have a higher level of moisture (25%) while wood pellets need to be dryer (8%).
Benefits of Biomass Heating
- Affordable heating fuel: even though the prices of wood fuel are not constant, it is cheaper than other heating methods.
- Financial support: wood fuel boiler system could benefit from the UK’s Renewable Heat Incentive (RHI).
- A low carbon option: the carbon dioxide emitted during the burning process is equivalent to the amount absorbed over the months and years that the plant was growing.
- Savings: biomass heating will contribute to both savings in carbon dioxide emissions and financial savings.
- Support for local business: biomass can be sourced from within the UK, which offers a steady supply and helps local and national businesses.
- Low maintenance: most of the modern biomass boilers require very little maintenance. In fact, some of the boilers can be fully automated without any user input. However, boilers should be serviced and inspected by a qualified service engineer on a yearly basis. If the boiler is not fitted with automatic flue cleaning, then regular cleaning and discharge of the ash bin are required on a weekly basis.
Frequently Aasked Questionss
What Are the Best Applications for a Biomass Boiler?
Biomass boilers should not be switched on and off such as fossil fuelled boilers. They need to operate continuously in order to achieve their highest efficiency.
How Many Biomass Boilers Are Currently Installed in the UK?
Several hundred biomass boilers have been installed in the UK in the variation in size from 50 kWh to the 220-megawatt system installed at a power station. Considering all the benefits of a biomass heating system, the number of installations is constantly increasing.
How Will My Fuel be Delivered?
Wood fuel can be supplied as logs or as bags of pellets. Wood pellets are often tipped and can be blown from the delivery vehicle equipped with fans for this purpose.
Do I Need Planning Permission to Install a Biomass System?
Planning Permission is not required for boiler installations in houses but it may be obligatory for installations in historical buildings or sensitive locations.
Do Biomass Boilers Produce Smoke?
A well designed and highly efficient boiler should not produce any smoke during the burning process unless in the case of a high level of moisture in the fuel.
Find the Best Biomass Boiler for Your Home
When it comes to biomass boilers, there are many choices on the market. It is important to evaluate what kind of biomass boiler would be best for your home and energy needs.
To compare multiple offers, simply fill in the contact form and GreenMatch will help you. With our service, you will receive up to four quotes from suppliers in your area. This service is completely free of charge and non-binding!