Lennox International Inc GWB9-100IH-2, GWB9-075IH-2 SEA Level Ratings Natural and Propane Gases

Table 1 - SEA LEVEL RATINGS – NATURAL AND PROPANE GASES

Model	Input	++ Heating Capacity	Net AHRI Rating	Shipping	Flue Diameter
	*(MBH)	*(MBH)	*(MBH)	Weight (lbs.)
90-50	50	45	39	220	2” CPVC & PVC
90-75	75	68	59	220	2” CPVC & PVC
90-100**	100	90	78	220	2” CPVC & PVC
* 1 MBH = 1,000 Btuh			Btuh = British Thermal Units Per Hour

** 90-100 model is certified for natural gas only.

++AFUE (Annual Fuel Utilization Efficiency) and Heating Capacity is based on the D.O.E. (Department of Energy) test procedure.

Heating Capacity indicates the amount of heat available after subtracting losses up the stack. Most of this heat is available to heat water. A small portion is heat from jacket and surfaces of the boiler, and it is assumed that this heat stays in the structure.

Net AHRI rating represents portion of remaining heat that can be applied to heat radiation or terminal units (i.e. finned tube baseboard, cast iron radiators, radiant floor, etc.). The difference between Heating Capacity and Net AHRI Rating, called piping and pickup allowance, establishes reserve for heating volume of water in system and offsetting heat losses from piping.

Net AHRI ratings shown are based on piping and pickup factor of 1.15 in accordance with AHRI Standard as published by Hydronics Institute. Net AHRI rating of boiler selected should be greater than or equal to the calculated peak heating load (heat loss) for building or area(s) served by boiler and associated hot water heating systems. Consult manufacturer before selecting a boiler for installations having unusual piping and pickup requirements.

Boilers are factory equipped for operation at altitudes ranging from 0-5,000 feet above sea level (4,500 feet in Canada).

Boilers for use at high altitude

Canada - Contact Provincial authority having jurisdiction for installations above 4,500 feet (1,350m) above sea level. United States - See “Boilers For Use At High Altitude” on page 6.