What is Lot 20?

From 1st January 2018, all local space heaters manufactured for sale in the EU which use electricity, gas or liquid fuels must comply with a minimum efficiency standard. The aim of this legislation is to remove inefficient technologies and reduce the energy used by the products that heat our homes, helping to achieve our overall carbon reduction targets.

Lot 20 affects:

  • Storage heaters
  • Direct acting heaters
  • Portable heaters
  • Radiant heaters
  • Electric fires
  • Gas fires 
  • Underfloor heating
  • Infra-red heaters

Lot 20 does not affect:

  • Local space heaters using a vapour compression cycle (heat pumps)
  • Local space heaters that are specified for outdoor use only
  • Sauna stoves
  • Slave heaters
  • Tubular heaters
  • Towel rails
  • Frost protection heaters
  • Air curtains


To ensure identification of compliant products, a labelling requirement has been included in the regulation. Websites and instructions, for both installer and consumer, must contain certain information.

For space heaters, the following information is required:

  • Heat output
  • Auxiliary electricity consumption
  • Temperature control type  - F2 compliance type
  • Additional features - F3 compliance type(s)

For portable heaters, the following sentence must be incorporated:

“This product is only suitable for well-insulated spaces or occasional use.”

Gaining compliance

In order for products to comply with the legislation, they must meet the minimum space heating energy efficiency requirement for that product category.

To learn more about these requirements, select a category below: