Relevant parts

The Domestic RHI scheme is intended to support the installation of new equipment.

To be eligible for the Domestic RHI scheme, all heat generating parts of the heating system must be new (ie. must not have been used before the heating system’s first commissioning date). We refer to the heat generating equipment of the heating system as "relevant parts". See Refurbished equipmentopen key term pop-up.

There are, however, some previously used relevant parts which are permissible under the Domestic RHI scheme. The following table shows a list of relevant parts that can and cannot have been previously used at the time of first commissioning.

Heating system type Cannot have been used before first commissioning date of heating system Can have been used before first commissioning date of the heating system Can have been used before first commissioning date of the heating system  
  (relevant parts which are not excepted components) (not heat generating components - ie. not relevant parts) (relevant parts which are excepted components)  
Biomass boiler Boiler Fuel storage/preparation/delivery equipment
Fixings
Controls
Emitters (e.g. radiators)
Hot water cylinders
Pipes
Circulation pumps
Supplementary electric heaters
Buffer tanks/ thermal stores
Expansion vessels

Immersion heaters for domestic hot water   Supplementary electric heaters Circulation pumps

 

Biomass stove

Stove
Heat exchanger
Integrated back boiler

Fuel storage/preparation/delivery equipment.
Pipes
Fixings
Controls
Emitters
Hot water cylinders Supplementary electric heaters
Buffer tanks/ thermal stores
Expansion vessels

Immersion heaters for domestic hot water   Supplementary electric heaters Circulation pumps

 
Ground (or water) source heat pump Ground or water loop
Heat pump unit/
Compressor
Internal oil/gas burner (hybrid heat pump systems)

Container and fixings
Pipes
Circulation pumps
Emitters
Hot water cylinders Supplementary electric heaters
Buffer tanks/ thermal stores
Expansion vessels
Controls

Immersion heaters for domestic hot water   Supplementary electric heaters Circulation pumps

 
Air Source Heat Pump Heat pump unit/
Compressor
Internal oil/gas burner (hybrid heat pump systems)
 
Container and fixings
Pipes
Supplementary electric heaters
Controls
Emitters
Hot water cylinders
Buffer tanks/ thermal stores
Expansion vessels
 
Immersion heaters for domestic hot water   Supplementary electric heaters Circulation pumps  
Solar Thermal

Solar Collectors (flat plate or evacuated tubes)*

Roof fixings
Pipes
Supplementary electric heaters
Controls
Hot water cylinders
Thermal store/buffer
 
Immersion heaters for domestic hot water   Supplementary electric heaters Circulation pumps  

*Evacuated tube cassettes / manifolds  are part of the plant see refurbished equipment

Refurbished equipment

No part of a renewable heating system that generates heat may have been used before the date that it is first commissioned. This means that refurbished generating equipment (the equipment used to generate heat) isn’t eligible for the scheme. More.