Pre-Installation2Codes ComplianceWater heater installation must conform with theinstructions in this manual and where applicable:• local, state, provincial, and national codes,laws, regulations and ordinances.• in Canada - CAN / CGA B149.1 or B149.2Installation Code.COMFORT water heaters are exempt from ASMESection VIII, Division 1 Code construction perInterpretation VIII-86-136. Check with local codesfor applicability.COMFORT Series water heaters willabsorb less than 200,000 BTU/hr whendomestic water outlet temperature is 210ºFand boiler water supply temperature is240ºF. Listed outputs are based on ASMESection VIII Interpretation VIII-1-86-136.Where recommendations in this manual differfrom local, or national codes, the local or nationalcodes take precedence.Codes RestrictionsSingle wall heat exchanger in the COMFORTwater heater complies with National StandardPlumbing Code, provided that:– boiler water (including additives) is practicallynon-toxic, having toxicity rating or class of 1,as listed in Clinical Toxicology of CommercialProducts, and– boiler water pressure is limited to maximum30 psig by approved relief valve.Single wall heat exchangers are permitted under theUniform Plumbing code - Paragraph L3.2. and L3.3if they satisfy all of the following requirements.1. The heat transfer medium is potable water orcontains only substances which are recog-nized as safe by the U.S. Food and DrugAdministration.2. The pressure of the heat transfer medium ismaintained less than the normal minimumoperating pressure of the potable water systemException: Steam complying with sec-tion #1 above.3. The equipment is permanently labeled toindicate that only additives recognized assafe by the FDA shall be used in the heattransfer medium.Other heat exchanger designs may be permittedwhere approved by the Administrative Authority.NOTICEComfort manual _Comfort 55 9/8/14 10:29 AM Page 4