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The September deadline for the ErP Direcve for Warm Air Heaters 2018 (Lot 21), is here. New legislaon has changed the way that the seasonal eciency of heang equipment is calculated. Danny Packham, European Product Manager – Warm Air and Radiant, at Nortek Global HVAC, outlines the key points.

effectively heating large open (industrial or commercial) spaces. By burning the fuel at point of use currently provides an efficient thermal and seasonal efficiency, the way in which manufacturers calculate seasonal efficiency (from 1st January 2018 changed due to ErP (Energy related Products) legislation coming into force.

What is ErP?

ErP (Energy related Products) is part of the Ecodesign regulation (EU) 2015/1188 which, along with the implementing Directive 2009/125/EC is an EU policy aimed at improving the energy efficiency and other environmental performance criteria for energy-related products (ErP), such as Radiant & warm air heaters.

For ErP, products have been divided into product groups or ‘Lots,’ with warm air heaters using gaseous or liquid fuels contained within Lot 21 & radiant heaters within Lot 20.

Each Lot provides the minimum energy efficiency and environmental values for each heating technology. Any product that does not comply with the requirements cannot be marketed and sold within the EU – including the UK. Following the referendum in the UK to leave the EU, the requirements of Ecodesign will still have to be complied with as it could take up to two years to finalise the process. Even then, unless new UK legislation is introduced, ErP will continue to be one of many methods employed by the Government to reduce the environmental impact of heating technology.

Lot 21 (warm air) has a max NOx emission of 100mg/kWh input plus a minimum seasonal efficiency of 72%. Seasonal efficiency is calculated from airflow temperature rise, thermal efficiency and electrical power consumption. Lot 21 also applies to AHUs and includes the performance of any heating/chilling coils, where human comfort is the primary heating purpose. Essentially, other than outdoor (heating an outdoor space) units, air curtains or ambient units, all products need to comply with either Lot 20 or Lot 21, plus the motor efficiency ErP regulation. Air Curtains are not considered warm air heaters by the scope of this Directive.

Will the NOx reducon aect products?

It should not affect the products, but may affect product offering from manufacturers. What it will do is ensure that some of the older technologies are withdrawn or modified to ensure compliance.

ErP: are you ready for the next milestone? G

as fired warm air and radiant heating systems are long-standing technologies associated with

On initial appearance the ErP seasonal efficiency looks to be a lot lower than the current building regulations seasonal efficiency calculation, however when these minimum thermal and radiant efficiencies are added into the ErP seasonal efficiency calculator, the approximate results are as follows:- uGas fired warm air heaters (atmospheric) = 70% (2% below) uRadiant (unitary) heaters = 71% (3% below) Therefore, a net increase of approximately 2% will be realised for warm air heaters and 3% for unitary radiant heaters manufactured from 1st January 2018 onwards.

As mentioned, ErP seasonal efficiency is calculated differently and produces a different result – a figure that is far lower than those previously used in the NCM tool (i.e. SBEM), therefore please ensure that the relevant seasonal efficiency figure is entered when carrying out your calculations. Remember, the seasonal efficiency shown by manufacturers on websites, technical manuals and sales brochures post 2018 will be ErP seasonal efficiency.

To summarise;

uSeasonal efficiency will be calculated differently (to include electrical power consumption). The current minimum seasonal efficiency would be 70% for Warm Air and 71% for Radiant, if we applied this calculation to our existing Building Regulations requirements. uErP Lot 21 (Warm air heaters) max NOx levels comes into effect this month (September 2018). For more information email or visit:

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