6
HEAT RATING TABLE — NATURAL GAS AND PROPANE
NOTES:
1. Heat ratings are for natural gas heat exchangers operated at or
below 2000 ft (610 m). For information on Propane or altitudes
above 2000 ft (610 m), see the Application Data section of this
book. Accessory Propane/High Altitude kits are also available.
2. In the USA the input rating for altitudes above 2000 ft (610 m)
must be derated by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating must be derated by 10% for altitudes of
2000 ft (610 m) to 4500 ft (1372 m) above sea level.
581J UNIT GAS HEAT
AL/SS HEAT EXCHANGER
TEMPERATURE RISE
(F)
THERMAL EFFICIENCY
(%)
INPUT/OUTPUT
STAGE 1 (MBH)
INPUT/OUTPUT
STAGE 2 (MBH)
17
LOW 220/178 176/142 20-55
81%MED 310/251 248/200 30-60
HIGH 400/324 320/260 35-65
20
LOW 220/178 176/142 15-55
81%MED 310/251 248/200 25-60
HIGH 400/324 320/260 30-65
24
LOW 220/178 176/142 15-55
81%MED 310/251 248/200 20-60
HIGH 400/324 320/260 30-65
28
LOW 220/178 176/142 10-55
81%MED 310/251 248/200 15-60
HIGH 400/324 320/260 20-65
CAPACITY RATINGS (cont)
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