
BOILER AND PRESSURE VESSEL CODE, SECTION IV FOR MAXIMUM ALLOWABLE WORKING PRESSURE. STEAM - 15 PSIG, WATER - 80 PSIG CANADA: STEAM - 15 PSIG, WATER - 50 PSIG CAUTION Do not use automotive anti-freeze in boiler waterways. If necessary to use antifreeze, be sure to employ a preparation designed for hydronic heating systems such as ethylene or propylene glycol. Water treatment is not recommended. This boiler uses gaskets to seal the ports of adjoining sections. These gaskets are made of a fluorocar