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HOT OUTLET EXPANSION TANK (OPTIONAL) MIXING VALVE COLD INLET CHECK VALVE (IF USED REQUIRES EXPANSION TANK) HOSE BIB (OPTIONAL) FLOW CONTROL SUPPLY RETURN CHECK VALVE EXTERNAL CIRCULATOR HYDRONIC IN-FLOOR LOOP FIXTURE Figure 15 COMBO HEATING - IN-FLOOR LOOP C H M HOT WATER TO HOUSE COLD SUPPLY EXTERNAL CIRCULATOR HOSE BIB (OPTIONAL) BASEBOARDS (SERIES CON WATER HEATER 8in TO 12in MAX. HOT OUTLET EXPANSION TANK (OPTIONAL) MIXING VALVE COLD INLET CHECK VALVE (IF USED REQUIRES EXPANSION TANK) FLOW C