Do I need metering?

Mae’r dudalen yma ar gael yn Gymraeg.

This only applies to applicants with biomass, air source heat pump and ground source heat pump systems

There are two types of metering that you may need on the Domestic Renewable Heat Incentive (RHI) scheme: metering for performance and metering for payment. Your circumstances determine whether you need to install one or both types of meters to meet the requirements of the scheme.

There is an optional Metering and Monitoring Service Package (MMSP) that you can register for in the Domestic Renewable Heat Incentive (RHI). Those who apply for it get paid extra towards some its costs. It’s a useful way of checking how well your system is performing and whether or not it is performing to the level promised by your installer. Additionally, installing an MMSP is one way of meeting your metering for performance and/or metering for payment requirements for heat pumps (if these apply to you).

Metering for Payment

If your heating system is accredited to the scheme and requires metering for payment, to receive payments you’ll need to submit meter readings every three months. You also need to meet your other ongoing obligations during the seven years your heating system is accredited under the scheme. Your payments will not be 'deemed', but instead will be calculated based on your meter readings.

Participants who are metered for payment are paid on the renewable heat that they produce, but for any installations accredited from 20 September 2017, the maximum annual payment is capped at the heat demand limit of your technology - or the annual heat demand of your property based on the figure in your EPC - whichever is lower.

Below we’ve set out the three most common situations where you’ll need to have meters for payment.

Where your plant needs to be metered for payment

The most common situations in which you will need to be metered for payment are where:

  • You have ‘back-up heating’.
  • You have a biomass heating system that isn’t designed to heat the whole property.
  • Your property is occupied for less than half the year.

This list is not exhaustive. For further details and examples, please read our Essential Guide to Metering.

To learn more about metering for payment, see our key term.

Metering for Performance

This section only applies to new Domestic RHI applicants with heat pumps on or after 22 May 2018.

If you make a successful application to the Domestic RHI on or after 22 May 2018, you need to have electricity metering arrangements installed alongside your heating system to be eligible for the scheme.

This change has been introduced to enable consumers to monitor the performance of their heating system and to provide a better understanding of the heat pump system’s electricity usage. Efficient heat pumps are essential to delivering savings on energy bills for consumers.

If your heat pump is metered for payment, you’re already required to have electricity metering, so you may already fulfil metering for performance requirements. In this case you wouldn’t need to install further electricity metering for performance.

If you’re only required to have meters for performance, your Domestic RHI payments will continue to be based on the deemed annual heat demand of your property based on the figure in your  Energy Performance Certificate (EPC)  – or the relevant heat demand limit - whichever is lower. Payments for heat pumps will continue to be made only on the renewable portion of the heat demand.

If you require metering for performance, you have three electricity metering options which can be used alone or in combination:

  1. standalone electricity metering
  2. on-board electricity metering
  3. Metering and Monitoring Service Package (MMSP)

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. For full details and examples, please read our Essential Guide to Metering.

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 monitor the efficiency of the heat pump and identify if there is an issue with an individual immersion heater/supplementary heater.

Publications and updates

  • Published: 19th Jul 2018
  • Guidance
  • 1 Associated documents
This guide covers metering information for people applying for the Domestic RHI who need metering for payment and/or metering for performance.

  • Published: 29th Nov 2017
  • Guidance
  • 1 Associated documents
Participants on the Domestic RHI who need metering for payment will need to submit meter readings quarterly.