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UK HIU standards revised for district heating efficiency push

A number of additional bodies will now be able to provide testing on standards devised to ensure greater efficiency for a vital component of heat networks

UK standards for Heat Interface Units (HIUs) have been revised and updated with an additional number of organisations now able to conduct testing.

BSRIA and Enertek International have been approved to carry out testing on the standard, alongside the Research Institutes of Sweden (RISE), which was previously the sole body to determine compliance.

The testing standard for HIUs, which are used to extract heating from district networks for individual buildings is managed by BESA. The organisation said the performance of HIUs was a key component to ensure the efficiency of district heating, with the standard being based on comparative performance data.

BESA said the original standard was the result of a research project into heat network efficiency that was backed by the Department for Business, Energy & Industrial Strategy (BEIS).

A methodology originally devised in Sweden was the basis for the standard, which was then amended to meet the specifics of UK operating conditions when comparing products by calculating factors such as annual weighted return temperature (VWART) and hot water response time.

The steering group that oversees the standard has also been expanded as part of the latest revisions, while a technical sub-committee made up of industry experts has also been established.

BESA said that a HIU manufacturers’ forum has already been held in London to offer feedback on the standard and its management.

Gareth Jones, chair of the HIU steering group, said that it was vital to have users involved in the standard.

He said, “It provides users with a clear basis on which to evaluate HIU performance and is rapidly becoming the default point of reference for those making procurement decisions within the industry.”

“As a result, HIU manufacturers must now ensure that their HIUs perform well and we are seeing a significant increase in R&D. Ultimately this raising of standards will help improve the health of the heat network industry as a whole.”

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