The latest information on Ecodesign – Lot 20 legislation for electric heaters. Our electric radiators offer maximum energy efficiency and comply with the latest Lot 20 legislation.

What is Ecodesign Lot 20?

Lot 20 is the key part of the new Ecodesign legislation which came into effect from 1st January 2018, and mandates that all electric space heaters and electric radiators comply with a set of minimum efficiency guidelines Energy Efficiency Directive (EED 2015/1188) and use enhancing features.

This new legislation from the EU 2015/1188 brought about the biggest upheaval the electric heating industry has experienced in decades, with new energy efficiency regulations coming into play that changed the landscape of available products and manufacturers. Lot 20 states that:

“All local space electric heaters manufactured for sale in the EU after 1st January 2018 which use electricity, or liquid fuels, must comply with a minimum efficiency standard. This includes electric radiators, electric under floor heating and electric and gas fires.”

What does this mean?

Essentially, Lot 20 demands that all electric space heaters sold after the 1st of January 2018 must incorporate intelligent room temperature controls, adaptive start function, and presence detection to minimise wasted energy. Very basically… From 1st January 2018 all electric space heaters sold in the UK must meet a set of minimum efficiency standards, this means that at the very least all heaters will have to incorporate intelligent room temperature controls to minimise wasted energy and comply with Energy Related Products Regulations (ERP) (Energy-related Products) Products within scope must meet a minimum 38% Energy Efficiency rating to fully comply.

New energy efficiency target for 2030, and annual savings requirement raised to 1.5%. Under the 2018 directive, the EU set an energy efficiency target for reducing energy consumption in 2030 by at least 32.5% compared to 2007 consumption projections for 2030.

electric radiators | electrical space heaters complies with Lot 20 Eco-design logo

To find out all you need to know about the Ecodesign Directive and how IntelliHeat smart radiators are fully compliant, please download our Ecodesign PDF below.

What are intelligent heating controls?

Intelligent heating controls managing the running times of your electric heater will incorporate three key features:

  1. 24-hour programmer Timer Control. This could be an integrated digital programmer, or as with our latest iSense radiators, a Wifi-connected internet-based smartphone app controller.
  2. Adaptive start control function. Accurate smart start  control for accurate room temperature measurement.
  3. Open window and presence detection. Open door, window recognition and presence detection technology reduce wasted energy when a thermostat detects a drop in temperature and the use of presence sensors to enable the heater to automate heating cycles.
Cali sense thermostat, Smart Electric radiators complying with ECO DESIGN Legislation

Cali Sense Thermostat - fully compliant with Lot 20 Ecodesign legislation

How does it benefit me?

The EU Commission and the UK government has recognised that the lack of efficient controls on electric heating has, for the past decade, been contributing to wasted energy and poor heating efficiency. 

As such this directive provides a legal framework to force manufacturers of electric heating products to meet a series of efficiency requirements which IntelliHeat has been designing into its products for a number of years now.

Effectively the integration of these technological features provides our customers with an average up to 30% saving on energy consumption as compared to old storage heater, panel heater or none intelligent control electric heaters.


Half of the energy used in our homes is used in the form of heat, as such this legislative change ensures that:

  1. You as a consumer benefit from the assurance that the electric radiators you purchase will deliver improved efficiency in your homes.
  2. Carbon emission targets are improved across the UK by minimising the amount of energy wasted through inefficient and poorly controlled domestic heating systems.

Which electric radiators are Ecodesign compliant?

All of the electric space heaters in our range meet Lot 20 legal requirements.  Through our Cali Sense, iSense, Balneum Eco, Creative Radiators range, IntelliHeat have been pioneering the integration of Intelligent electric heating controls on direct-acting electric heating systems since 2010. 

Indeed, we have worked tirelessly to deliver an intelligent, highly efficient and fully controllable heating system to the UK market, and have promoted the Ecodesign legislation’s key drivers in each of our ranges since the Ecodesign Lot 20 legislation was approved in the EU parliament in August 2015.

Lot 20 Regulations for electric space heating:

In order to distinguish the energy efficiency ratings of each product, a percentage compliance score, based on the amount of energy saving features it has, will be displayed in the product information and specification.

All electric heaters start with the same initial value of 30%. This is a benchmark from which high-efficiency, eco-friendly designed heating products can be distinguished from their more basic counterparts, according to the scores obtained under the product energy performance factors. The minimum energy efficiency ratio value that an electric heating system must reach under Lot 20 legislation is 38%.

The first factor is based on the type of temperature control that the product has. Electric radiators with a simple mechanical control or without a control receive a value of 0%. Products with a built-in temperature control and a daily, weekly timer get a value increase of 7%.

The other factor is based on the benefits derived from special functions that specifically improve energy efficiency. Cali Sense and iSense incorporate built-in temperature control software with open window detection, presence detection and a self-learning mode. They also include a remote My-Sense smartphone app control and an adaptable start-up control, all of which add a further 3% to the initial 30% value that all-electric heaters have.

The Cali Sense range, which was designed specifically according to the key principles of the Ecodesign for Energy-related Products (ErP) Regulations 2018, provides users with integrated intelligent electric heating control functions which comply with, and indeed exceed, all the requirements of Lot 20, with the maximum of a 40% Energy Efficiency rating.

Intelli Heat 40% Energy Efficiency rating achieved with Ecodesign:

+ 0 %
for an electronic room temperature control plus week timer
+ 0 %
for an electronic room temperature control plus day timer
+ 0 %
for an electronic room temperature control
+ 0 %
for a thermostat room temperature control
+ 0 %
for a room temperature control with open window detection
+ 0 %
with distance control option (eg WiFi compatibility)
+ 0 %

with adaptive smart start control

+ 0 %
with presence detection

Are you ready to take advantage of Lot 20 - Ecodesign? The future is efficient, the future is intelligent, the future is IntelliHeat.

Download the Lot 20 Legislation, Guidelines and Consumer Guides

Ecodesign Legislation Guidelines​

Setting of Ecodesign Requirements for Energy-related Products

Ecodesign Consumer Guide to Energy-Efficient Space Heaters