44
TABLE 12-1: SEA LEVEL RATINGS
NATURAL AND PROPANE GASES
Size
Boiler Input Rate (MBH)
(1)
Heating Capacity
(MBH)
(1)(2)
Net AHRI Rating,
Water (MBH)
(1)(3)
AFUE
(2)
Maximum Minimum
050
50 10 46 40 95.0
075
75 15 69 60 95.0
100
100 20 91 79 95.0
150
150 30 139 121 95.0
200
200 40 185 161 94.0
(1)
1000 Btu/hr (British Thermal Units Per Hour)
(2)
Heating Capacity and AFUE (Annual Fuel Utilization Efciency) are based on DOE (Department of Energy) test
procedures.
(3)
Net AHRI Ratings based on piping and pickup allowance of 1.15. Contact Technical Support before selecting boiler for
installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems,
etc.
12 - RATINGS AND CAPACITIES
12.1 Ratings and Capacities
• Constructed and hydrostatically tested for maximum
allowable working pressure of 50 psig (pounds per
square inch gauge) (345 kPa) in accordance with ASME
Boiler and Pressure Vessel Code, Section IV, Rules for
Construction of Heating Boilers.
• Ratings used for elevations up to 2000 ft (600m) above
sea level.
• For elevations between 2000 ft (600m) and 4500 ft
(1350m), install high altitude control kit
• For elevations above 4500 ft (1350m) install high
altitude control kit and :
• USA - Reduce input rate 4% for each 1000 ft
(300m) beyond 4500 ft.
• Canada - Contact Provincial authority having
jurisdiction for installations above 4500 feet (1350
m) above sea level.
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