Standalone Metering

The Government has introduced changes to the Domestic RHI Regulations. Changes were introduced in two stages. The first stage of changes to the Domestic Scheme came into effect on 20 September 2017. The second stage came into effect on 22 May 2018.

For more information about changes to the scheme and what they mean to you, please see our changes to the scheme webpage and our Factsheet: Important changes to the Domestic RHI Scheme.

If you apply to the scheme with a heat pump on or after 22 May 2018, it must meet metering for performance requirements. There are three ways you can meet this requirement: standalone metering, on-board metering or a Metering and Monitoring Service Package (MMSP).

One option for meeting the requirements of heat pump metering for performance is to use a standalone electricity meter. It measures the electricity consumption of your heat pump. The electricity meter will likely have to be purchased in addition to the heat pump, and the meter will need to be installed alongside your heat pump prior to you applying to the scheme.

There are certain technical specifications and accuracy requirements that standalone electricity meters need to meet.

Standalone meters must comply with the specific requirements in the 2014 Measuring Instruments Directive (MID). The meters must fall within accuracy of Class A or better, as defined in Annex V of the MID. (Meters marked class 1 or 2 are not compliant). This will mean that your electricity meter will measure the electricity consumption of your heat pump accurately in isolation from other devices in your home.

The meter(s) will be required to record and display:

  • electricity used by the plant to generate heat;
  • electrical input into any supplementary electric heater controlled by the same control system as the heat pump; and
  • electrical input into any immersion heater for a domestic hot water cylinder where the immersion heater is controlled by the same control system as the heat pump.

This will need to be added on your MCS Certificate.

Note: If there are multiple supplementary or immersion heaters controlled by the same control system as the heat pump, a single meter can be installed to record the total combined electrical input; or, each heater can be metered separately. Metering input to each heater separately could help identifying if there is an issue with an individual immersion heater/supplementary heater.

For more detailed information on metering, please see our Essential Guide to Metering. Speak also with your installer about the right meters for you.