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Combustion gas circuit The combustion gas circuit is paint protected and comprises: • Flue pipes HeatMaster 71/101 models contain 8 steel flue pipes with an internal diameter of 64 mm. Each pipe is fitted with a turbulator of stainless steel designed to improve heat exchange and to reduce flue gas temperature. • Combustion chamber The combustion chamber on HeatMaster models is entirely water cooled. Insulation The boiler body is fully insulated by rigid polyurethane foam with a high thermal insu