Calorifier 2 : An apparatus used for the transfer of heat to water in a vessel by indirect means, the source of heat being contained within a pipe or coil immersed in the water
Health and Safety Executive (HSE), Legionnaires' disease: The control of legionella bacteria in water systems (Approved Code of Practice and general guidance), Merseyside, England, UK 2013. ISBN 978 0 7176 1772 2, http://www.hse.gov.uk/aboutus/meetings/hseboard/20 13/220513/pmayb1352a.pdf, (Hlth and Sfty - Brit) {722}