When Marks and Spencer’s property team drew up plans for refurbishment of their busy St. Neots store it was decided that the ageing combustion boiler that had been a reliable if somewhat Inefficient mainstay of the store’s heating system, would have to go. A decision was made in favour of using a new generation CO2 heat pump instead of a boiler and a competitive tendering exercise aimed at identifying the best all round value for money CO2

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