Open letter on the eligibility of ISO 4064:2014 and MID MI-001 water meters in the GB and NI Renewable Heat Incentive Schemes

Publication date
31st May 2019
Closing date
1st July 2019
Policy areas

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 the these meters.