PHMI contains data from GfK’s ground-breaking Plumbing & Heating Merchants Panel. It analyses data from specialist Plumbing & Heating Merchants accounting for around £3bn and representing over 80% of total value sales to this market.  There is no overlap or double counting between PHMI and BMBI sales data.

GfK’s Plumbing & Heating Point of Sale Tracking Data is a gold standard in reliable market trends. Unlike data from sources based on relatively small samples or estimates, or sales from suppliers to the supply chain, this up-to-date data is based on actual sales from specialist plumbing & heating merchants. It is, in effect, the market.

PHMI trend data is indexed on the 12 months of 2019. Currently, data is available by total monthly value sales and the series tracks what is happening in the plumbing and heating market month by month. This trend series gives the industry access to far more accurate insights than has been available.

MRA Research produces the Plumbing & Heating Merchant Index, a brand of the BMF, to provide reliable data, and a platform and voice for this important industry and for leading plumbing and heating brands to communicate to the wider market.

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PHMI Experts

Plumbing & Heating brands who are interested in becoming PHMI Experts and speaking for their markets and building their brands should contact Tom Rigby or Ralph Sutcliffe: /

More data available

This PHMI report provides valuable top-level indices but there’s considerably more data available. GfK insights go much deeper and can quantify market values and drill down into contributing categories, tracing product group performance, to focus on aspects that are critical to you.

GfK can produce like-for-like market comparability tailored to the requirements of an individual business. Merchants or suppliers who are interested in acquiring data or getting involved should contact Emile van der Ryst at


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