Safety requirements, associated test methods and thermal efficiency of gas heating equipment of machines wherein water is either heated by an integral gas burner or by circulating hot water from an adjacent heater, or where a separate heater supplies rinse water.Cross References:BS 21BS 567BS 715BS 835BS 864:Part 2BS 1041:Part 4BS 1179BS 1250:Part 3BS 1552BS 1756BS 1963BS 2775BS 3016BS 3456BS 3554BS 4201BS 4947BS 5258:Part 1BS 5292BS 5314BS 5440:Part 1BS 5494BS 5963BS 5978BS 6047:Part 1BS 6067PD 6444Factories Act, 1961Health and Safety at Work etc. Act 1974Gas Safety Regulations 1972Building Regulations 1976Building Standards (Scotland) (Consolidation) Regulations 1971