BS 855:1976

Hot water boilers with maximum operating pressure of 0.45 N/mm² and temperature of 132°C. Steam boilers limited to output of 1500 kW with max. operating pressure of 0.2 N/mm² and temperature of 132°C. Specifies min. efficiencies for oil, gas and solid fuel firing. Materials, design stress and manufacture, workmanship, inspection, hydrostatic testing, mounting and fittings, automatic controls and electrical wiring requirements.