Staff in the new headquarters of the Greater London Authority should be able to work in comfort thanks to two Viessmann Vitoplex gas boilers. The 750 kW boilers form the centre of the Arup-designed heating system for the nine-storey glazed building. The system, installed by Axima Building Services, includes a mix of underfloor and perimeter heating. Hot water passes through the horizontal steel structural elements of the north-facing wall making them act as a giant radiator.