RHI Heat Meters

Heat Meters for Domestic & Commercial Renewable Heat Incentive Scheme

T&D have the expertise and product portfolio to offer heat meters suitable for both the commercial and domestic renewable heat incentive scheme.

Heat Meters for Renewable Heat Incentive Applications - Itron CF Echo IIHeat Meters for Renewable Heat Incentive Applications - Sensus PolluStat EHeat Meters for Renewable Heat Incentive Applications - Sensus Supercal 531Heat Meters for Renewable Heat Incentive Applications - Kamstrup Multical 402

The Renewable Heat Incentive (RHI) is a UK scheme which provides a financial incentive for claimants to generate and use renewable heat sources such as solar panels, biomass boilers, ground or water source pumps amongst others.

Switching to renewable heat sources helps to reduce carbon emissions and reduce the reliance on fossil fuel technologies.

Heat meters are a vital component of most RHI applications to provide evidence of the renewable heat generated and used.

RHI Heat meters are comprised of a heat calculator, flow meter and two temperature probes which together use the fluid density, heat capacity, flow rate and temperature difference to determine the renewable heat provided.

Heat Meters for RHI Applications

Domestic Renewable Heat Incentive

The domestic RHI scheme opened in April 2014 and provides payments for 7 years.

The scheme is available to properties which are capable of obtaining a EPC (Energy Performance Certificate) and is open to households both on and off of the gas grid.

Domestic Renewable Heat Incentive Requirement - Energy Performance Certificate

Households who are not on the gas grid have the most potential to make a difference in carbon emissions and save on fuel bills.

The domestic RHI scheme is open to single households including private landlords, social landlords and self-builders but it is not open to new build properties.

Domestic Renewable Heat Incentive Payment Tariffs
Technology Tariff
Air-source heat pumps 7.3p per kWH
Ground & water source heat pumps 18.8p per kWH
Biomass-only boilers and biomass pellet stoves with integrated boilers 12.2p per kWH
Solar thermal panels (flat plate and evacuated tube for hot water only) 19.2p per kWH
Source - Gov.UK Increasing the use of low-carbon technologies policy

Payments for the scheme are to be made quarterly and are typically made on an estimation of the annual heat use.

This is determined by the technology used, for example biomass and heat pump systems use the heat load as identified on the EPC, whilst for solar panels it is calculated by the MCS (Microgeneration Certification Scheme) certified installer. Microgeneration Certification Scheme (MCS) Certified Installers are required for domestic RHI claims

Some claimants will be required to install heat metering systems which comply with MID class 3 or higher and is necessary if a back up heating system is also installed, or a biomass heating system isn't designed to heat the entire property or if the property is occupied for less than 6 months.

The installed RHI heat meter will be used to submit regular readings which will be used to more accurately determine payments.

Commercial Renewable Heat Incentive

The commercial RHI scheme has been open for claimants since November 2011 and is available to commercial, industrial and public buildings including businesses, hospitals, schools, and district heating systems which provide heat to multiple households.

The commercial RHI scheme provides payments for 20 years and includes a much larger range of renewable heating technologies.

Commercial Renewable Heat Incentive Payment Tariffs
Tariff Eligible Technology Eligible Sizes Tariffs from 28th May 2014 Tariffs from 1st July 2014 Tier
Small commercial biomass Solid biomass including solid biomass contained in waste Less than 200kWH 8.8p 8.4p 1
2.3p 2.2p 2
Medium commercial biomass (accredited on or after 1st July 2013) Between 200kWth and 1MWth 5.1p 5.1p 1
2.2p 2.2p 2
Large commercial biomass (accredited on or after 21st July 2013) 1MWth and above 2p 2p -
Solid biomass CHP systems (commissioned on or after 4th December 2013) Solid biomass CHP systems All 4.1p 4.1p -
Ground source heat pumps (accredited on or after 21st July 2013) Ground source heat pumps & water source heat pumps All 8.7p 8.7p 1
2.6p 2.6p 2
Air source heat pumps (commissioned on or after 4th December 2013) Air source heat pumps All 2.5p 2.5p -
Deep geothermal (commissioned on or after 4th December 2013) Deep geothermal All 5p 5p -
All solar collectors (accredited on or after 21st January 2013) Solar collectors Less than 200kWth 10p 10p -
Biomethane injection Biomethane All 7.5p 7.5p -
Small biogas combustion Biogas combustion Less than 200kWth 7.5p 7.5p -
Medium biogas combustion (commissioned on or after 4th December 2013) Between 200kWth and 600kWth 5.9p 5.9p -
Large biogas combustion (commissioned on or after 4th December 2013) 600kWth and above 2.2p 2.2p -

Source - Ofgem Tariff's & Payments

Note - the next quarterly tariff table will be published 15/09/14

Commercial applicants are required to submit a large number of documents and evidence to support their application including:

  • Commissioning certificate or report
  • Installation schematic diagram
  • Photo of RHI heat meter displaying serial number and MID Class 2 markings
  • Letter of company authorisation
  • ​Proof the property is non-domestic
  • If the installation has a capacity of 1MW or higher, or multiple meters are used an independent report on metering arrangements is required
  • Evidence of Coefficient of Performance COP (Technical) - Heat pumps only
  • Photo of installation displaying the capacity and serial number

Due to the increased complexity of the Commercial RHI scheme heat metering is mandatory and must comply with MID class 2 or above.

RHI Heat Meters & MID Accuracy Classes

Both the domestic and commercial RHI schemes specify that heat meters must meet or exceed a specified MID accuracy class. MID is a European Union for which heat meters must comply with

MID is the Measuring Instruments Directive (2004/22/EC), a European Union directive which aims to unify former regulation guidelines for each European country into one legislation, eliminating technical trade barriers.

MID outlines legislation for the following measuring instruments:

  • Heat Meters
  • Water Meters
  • Gas Meters
  • Electrical Energy Meters
  • Exhaust Gas Analysers
  • ​Measuring systems for continuous & dynamic measurement of liquids other than water
  • Automatic weighing instruments
  • Taxi meters
  • Material measures
  • Dimensioning systems

In regards to the RHI scheme, heat meters are required to comply with accuracy classes as set out by the MID.

The MID states within Annex MI-004 of the directive that the maximum permissible errors which define the accuracy class are as follows:

Class 1: Ef = (1 + 0.01 qp/q), but not more than 5%

Class 2: Ef = (2 + 0.02 qp/q), but not more than 5%

Class 3: Ef = (3 + 0.05 qp/q), but not more than 5%

Where the error Ef relates the indicated value to the true value of the relationship between the flow meter output signal and the mass or the volume.

Heat meters must comply with class 2 or above for commercial RHI claims and class 3 or above for domestic RHI.

Higher class RHI heat meters are recommended to provide more accurate readings and typically have a longer life span.

T&D offer RHI Compliant Heat Meters

RHI Heat Meters from T&D

T&D are able to provide a broad range of heat metering systems to suit both domestic and commercial applications, ranging from simple installations and heat meters to more complex systems.

Manufactured by worldwide leaders in energy measurement, T&D offer RHI heat meter solutions from Itron, Kamstrup, Sensus & Sontex.

Itron RHI Heat MetersKamstrup RHI Heat Meters


Sensus RHI Heat MetersSontex RHI Heat Meters

Contact us now to discuss your RHI scheme requirements and find the most suitable RHI heat meter for your needs.

T&D can provide competitive solutions with next day deliveries subject to availability.

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Renewable Heat Incentive

Heat Tracing - Thorne & Derrick