The DEFRA (Department for Environment, Food and Rural Affairs) exemption list is a register of specific stove and boiler models that have been tested against a particulate emissions limit and approved for use inside a smoke control area (a zone designated under the Clean Air Act 1993 where only authorised appliances and authorised fuels may be burned). The list is the only document that carries legal weight here. An installer telling you a stove is compliant is not the same as that stove appearing on the DEFRA register under its own name.

How to search the list for your model

The list is searchable by manufacturer and model name, and it is worth searching by the exact model designation printed on the appliance data plate, because manufacturers sometimes list several near-identical variants separately, each with its own entry and its own approved fuel.

• Search by the precise model name and manufacturer shown on the appliance's rating plate.
• Check whether the entry lists a specific output rating, since some models are approved only at a particular kW output.
• Note the date the appliance was added, since the list is updated as new models are tested and older entries can be withdrawn.

What exemption actually permits

Exemption covers a named appliance burning a named fuel. A pellet stove entry on the list will usually specify wood pellets as the authorised fuel, and burning anything else in it, including ordinary house coal or unseasoned logs, falls outside what the exemption allows even though the appliance itself is on the register. This is the detail that trips people up: the exemption is granted to the combination of stove and fuel that was tested.

For the wider legal position on smoke control areas, including how designation is decided and how to check whether your address falls inside one, see Smoke Control Areas, DEFRA Exemption and the Law. For what the authorised fuel itself needs to look like, including the ENplus (wood pellet quality certification standard) and what affects how it burns, see Pellets: Quality, Storage and Delivery.

An appliance on the DEFRA exemption list is only exempt for the fuel named on its exemption certificate, so burning anything else in it can still be a breach of smoke control rules even though the stove itself is approved. Most pellet stove exemptions specify wood pellets meeting a stated quality standard, sometimes referencing ENplus certification. Fitting the same stove but feeding it loose kindling, house coal or logs takes it outside the terms of its exemption, and the legal position reverts to the general rule for that area.

The certificate covers appliance and fuel together.

DEFRA's list records a specific combination: this model, tested and approved for use with this fuel. A pellet stove that appears on the list is not automatically cleared to burn any solid fuel a supplier happens to sell. Before assuming a stove is covered, check the exact fuel description on its exemption entry. Details on sourcing fuel that meets the relevant standard are covered in Pellets: Quality, Storage and Delivery.

Installation and modification can void the exemption

The exemption is granted for the appliance as tested, which assumes it is installed and operated broadly as the manufacturer specifies. A stove that has been altered, for example with a baffle removed or a different flue arrangement fitted from the one it was tested with, may no longer perform as the certificate assumes, even though it carries the same model name. Installation requirements sit alongside the smoke control question, and both need checking separately; see What Installation Really Involves.

Who enforces this and what a breach means in practice

Smoke control areas are enforced locally, under the Clean Air Act 1993, by the relevant local authority. A local authority that identifies a breach, whether from the wrong fuel, an unlisted appliance, or smoke escaping in a way the exemption does not cover, can act against the householder responsible. The specific penalty a council applies is a matter for that authority and can change, so this site does not state a figure that could go stale or vary by area.

None of this changes by postcode alone. Whether a property sits inside a smoke control area at all, and what that means for a specific appliance, is worth checking directly. See Smoke Control Areas, DEFRA Exemption and the Law for how to check an address.