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Are your Biomass Boiler meters not to current standards? from MWA Technology

Are your Biomass Boiler meters not to current standards?

June 24, 2019

Eligibility of ISO 4064:2014 and MID MI-001 water meters in RHI schemes for Biomass Boilers

Non-domestic RHI applicants and participants, renewable heat installers, meter manufacturers and suppliers, renewable heat trade bodies and meter testing laboratories will have received an open letter from Ofgem which outlines its review of current standards and the eligible criteria in respect of heat meters.

Biomass Boilers Meters

Biomass Boiler Meters – Ofgem’s Open Letter

This open letter sets out Ofgem’s understanding of the requirements of BS EN ISO 4064-2014 (“ISO 4064-2014”) and the Measuring Instruments Directive (“MID”) Annex MI-001, and whether heat meters that use flow meters that meet the requirement of these standards also meet the requirements stipulated in regulation 2 of both the GB Regulations and NI Regulations for a “class 2 heat meter”. The open letter is seeking views on this understanding, as well as feedback on Ofgem’s proposed course of action in relation to these meters.

Biomass Boilers Meters

Biomass Boiler Meters – The communication comes as no surprise

MWA know better than anybody how many RHI participants with Biomass boilers were sold wrongly specified heat meters. MWA pride themselves on correct meter specification and have protested regularly on the harm and lack of meter reading accuracy that can be caused with a wrongly specified meter.

Many people will be looking to metering experts to help with the problem once Ofgem close the case articulated in the open letter and review the findings. MWA will be on-hand and ready to assist.

Metering Site Surveys

Biomass Boiler Meters – Getting to the root of the problem

MWA will get to the root of the problem by helping to replace meters that fit in the space of the mechanical flow part. Typically, the flow meter is designed specifically to act as a component or a heat meter. Others may be designed as a water meter but may be used in conjunction with other components to form a heat meter. Ofgem are reviewing the associated standards to seek views on whether heat meters that use flow meters that meet the requirements of the standards also need the requirements stipulated in regulation 2 for a “class 2 heat meter”.

MWA have a full understanding of what the Regulations require and when a meter is specified by MWA, problems that arise down the line such as this one will not affect its choice. To provide an example which could be appropriate for many people who were wrongly specified meters under the RHI scheme, MWA offer the following:

A mechanical 80mm water meter is 225mm in length and the Axonic flow part from Itron which is full ultrasonic comes in a 225mm option. This is a simple example of how MWA can replace meters that fit in the space of the mechanical flow part with meters that meet all criteria and are renowned for their quality and longevity.

Itron Axonic Heating & Cooling Meter


If you would like assistance in this matter or would like to understand how you may be affected, contact the metering experts at MWA on 0121 327 7771 or email Sales Manager Matt Rose.

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  • 5 Year warranty on any meter specified by MWA

Itron CF ECHO II Heating & Cooling Meter

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