Power Input	Natural Gas: 28,000 - 117,000 Btu LP Gas: 28,000 - 117,000 Btu
Minimum Flow to Activate	0.5 gallons per minute (gpm)
Flow Rates	50°F rise @ 3.6 gpm 55°F rise @ 3.3 gpm 65°F rise @ 2.8 gpm 75°F rise @ 2.4 gpm 90°F rise @ 2.0 gpm
Energy Factor	NG: .64  LP: .79
Thermal Efficiency	NG: 80%  LP: 86%
Dimensions	Height: 29.75" Width: 18.25" Depth: 8.75"
Weight	44 lbs.
Modulating Gas Valve	Yes
Optional Accessories	Power vent for horizontal venting (AQ1)

Gas Connections	½" Male NPT
Water Connections	½" Male NPT
Natural Gas Pressure	Minimum: 7" WC Maximum: 14" WC
LP Gas Pressure	Minimum: 11" WC Maximum: 14"
Water Pressure	Minimum: 18 PSI Maximum: 150 PSI
Electrical Supply	None
Vent Size	5" (double wall type B)
Vent Termination	Vertical

Power Vent Option
Power vent option illustrating the side wall vent option that allows horizontal venting and elimination of the chimney (Part #AQ1).

Closet installation of 125B with proper venting shown.