Wood burning stoves: what you need to know
Wood heating systems
Article 2 of 6
Wood heating systems
We talk you through the different types of wood heating systems, including what the pros and cons are of getting and using a wood heating system.
Wood heating systems burn organic materials - typically wood logs, pellets or chips - in a stove or boiler to provide heat and hot water. Technically, a wood heating system is known as a biomass system.
Stoves are generally used as standalone room heaters for one room. But stoves can incorporate or be connected to a boiler, called a boiler stove or back boiler. This will harness the stove’s energy to provide heat and hot water to the rest of the house.
Below, we talk you through how wood heating systems work and the pros and cons of getting a full wood heating system.
If you're thinking of getting a stove, it's worth taking a look at our guides to buying a stove, which includes insider tips from stove owners. You should also check out stove costs - our comprehensive guide to what could affect the cost of getting a stove, and how much you could really save.
How do biomass boilers work?
Stoves can be connected to a regular boiler, such as a gas boiler, or a biomass boiler. Biomass boilers, like stoves, burn wood to generate heat. They can be used along with a stove, or on their own, and are particularly good for homes not connected to mains gas.
You can use a thermal tank to link up a range of heating systems, such as solar panels, a gas boiler and a wood burning stove. A thermal tank (also known as a buffer tank or accumulator) will help regulate the fluctuating use of the different energy sources - eg sun for solar panels in the summer, and logs for a wood burning stove in the winter.
If you’re thinking about replacing your gas or oil or LPG boiler as well as getting a stove, our boiler reviews can show you which is the most efficient.
Pros of wood heating
- Biomass materials are considered a carbon-neutral source of energy because, despite producing carbon dioxide when burnt, they only release roughly the same amount they absorb while growing. The Stove Industry Alliance (SIA) estimates that wood logs produce 0.008kg of CO2 per kWh, compared to 0.198kg for gas and 0.517kg for electricity. Locally-produced biomass materials are even better in terms of carbon, as less carbon is produced when transporting it shorter distances.
- Stoves are more efficient than many other types of standalone room heaters. According to the SIA, an open fire has the efficiency of around 32%, and a gas fire in the region of between 20% and 55%. Stoves, on the other hand, currently have efficiency ratings of between 60% and 80%, and this is due to increase further. By 2022, new EU regulations will mean all stoves must be at least 80% efficient.
- Using biomass will reduce your dependence on traditional fuels, such as gas and electricity. These are more subject to global demand, and in the future their prices are likely to be higher and more volatile.
- If you have a room thermostat in the room where a stove is installed, then your central heating will turn off sooner as the stove heats the room. So it will save you money overall.
- The Renewable Heat Incentive was launched in spring 2014 and it will pay you to produce heat from a wood heating system. Wood burning stoves on their own don't count under the scheme, but biomass boilers, solar thermal panels, and ground source and air source heat pumps all do. You can find out more in our guide to the Renewable Heat Incentive.
Cons of wood heating
Costs for installing a whole biomass system, a stove and a boiler could be more than £15,000.
- The initial cost of a wood heating system can be high - between £1,000 to £3,000 for a simple log stove and installation, and £5,000 to £11,500 for a wood pellet boiler and installation. We spoken to industry experts and installers to find out what can affect the costs - take a look at our guide to stove costs to find out more about how much you may need to spend.
- Unlike other renewable energy technologies, with biomass you still need to buy the fuel. Fuel costs depend on the type of fuel, the distance you are from your supplier, the time of year you buy and whether you can buy in large quantities. The type of fuel you use can also impact on how much you might be able to save - visit our page on using a stove to find out what's best.
- While biomass heating is suitable for any type of building, you need to have space to store the fuel and to access the system for loading. There are also building regulation considerations that affect where a stove can be placed, what needs to be done to the chimney and how much room it needs surrounding it, which can all impact on the cost of installation. A reputable installer should be able to help you make a decision on what type of biomass heating system would best suit your home.
Take a look at our guide to installing a wood burning stove to find out what's really involved. It also includes a video of a typical stove installation as well as a handy downloadable checklist for members to help walk you through the whole buying process - Which? members can just log in to download it.
If you're not a member, you can gain access to all our reviews and expert advice with a £1 trial subscription to Which?.
Making your home efficient
As well as looking at the options for wood heating, it’s worth thinking first about other ways you can make your home more efficient. This will mean you need a lower wattage stove - which will use less fuel. Some of these include: