What is a DEFRA Approved Stove?

A DEFRA Approved stove, also known as a DEFRA Smoke Exempt Appliance, is a wood burning stove that has been tested and certified by the UK Government's Department for Environment, Food and Rural Affairs (DEFRA). To receive this certification, the stove must meet strict criteria for emission levels and smoke output during all stages of normal operation.

In practice, a DEFRA Approved stove has been modified by the manufacturer to prevent the air supply from being cut off completely. This ensures the fuel always receives the minimum amount of combustion air needed to burn efficiently without producing unnecessary smoke, keeping the appliance compliant with the Clean Air Act.

Why buy a DEFRA Approved Stove?

If you want to burn wood and you live in a designated UK Smoke Control Area, which covers most cities and large towns, you are legally required to use a DEFRA Smoke Exempt Appliance. Operating a non-approved stove with wood fuel in a Smoke Control Area is an offence and can result in a significant fine.

Even outside a Smoke Control Area, a DEFRA Approved stove is a good choice. Because it cannot produce nuisance smoke when operated correctly, it is better for air quality and better for your neighbours. Your chimney and flue system will also stay cleaner for longer, as less soot is produced.

What is different about a DEFRA Approved Stove?

From the outside, nothing. The difference is internal, usually a modification to the combustion air control mechanism that ensures a small but continuous supply of air reaches the fuel even when the controls appear fully closed. This prevents the smouldering and smoke associated with starving the fire of air.

Some manufacturers charge a small premium for the DEFRA Approved version of a stove to cover testing costs. Others offer a separate Smoke Exempt compliance kit, or specify that an adjustment is made by the installer. if you live in a Smoke Control Area and you burn wood without the kit fitted or the adjustment made, you are breaking the law.

Can I use a DEFRA Approved Stove to burn other fuels?

If the stove is also a multi-fuel model, you can burn approved smokeless fuels in a Smoke Control Area provided they are on DEFRA's authorised list and the stove manufacturer's manual permits their use. However, burning damp wood or any wet fuel will create nuisance smoke and you will be in breach of the Clean Air Act regardless of whether your stove is DEFRA Approved.

Is a DEFRA Approved Stove better overall?

In most respects, yes. The requirement for a continuous minimum air supply means the stove burns more consistently and produces less soot. This is better for air quality and means fewer chimney sweeps are needed over time.

The one trade-off is overnight burn time. Because the air supply cannot be fully restricted, a DEFRA Approved stove will not slumber burn as long as a non-approved equivalent. If extended overnight burning is a priority, this is worth considering when choosing your stove.

Can I fit a non-DEFRA Approved Stove in a Smoke Control Area?

Yes, but you may only burn DEFRA Authorised Smokeless Fuels, not wood. Naturally smokeless fuels such as Anthracite, or manufactured smokeless ovals, are permitted. A full list of authorised fuels is available on the DEFRA website.