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20 F degree approximately boiler operation boiler or boilers BTU per cubic Btu per hour Bureau of Standards calorimetric method circulating water concept of boiler curves for systems cycling boiler efficiency tests efficiency versus heating efficiency versus load error F degree temperature Figure flow rate flue gas temperature foot of gas gas at standard gas meter heating load curves higher heating value hydronic idle modules inches inches of Mercury Legal Aids building loss due maximum heating load measured modular boiler installation modular concept modular installation modular system run National Bureau oversized pilot lights potentiometer primary pumping primary-secondary pumping return temperature seasonal efficiency secondary valving single boiler system single large boiler sling psychrometer standard conditions standard cubic foot steady state test supply and return supply temperature system with primary system with secondary test setup testing period thermocouple thermopile versus heating load versus load curves wet bulb temperature