CASE STUDY COMMERCIAL Building type: 1960s office complex Technology used: High efficiency boiler Passive flue gas recovery device Solar thermal Air-to-water heat pump Ground source heat pump Mechanical ventilation & heat recovery Installer: In-house team In late 2011/early 2012, Vaillant’s headquarters in Belper, Derbyshire was subject to a £3.5 million refurbishment and extension. Home to both the UK manufacturing operation and

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