2
BOILER RATINGS AND CAPACITIES
(1)
MBH = 1,000 Btuh = British Thermal Unit Per Hour
** Add 5½” to height for vent Damper.
(2)
For altitudes above 2,000 ft. rating should be reduced at the rate of 4% for each 1,000 ft. above sea level.
(3)
Heating Capacity is based on D.O.E. (Department of Energy) test procedure.
(4)
Net I=B=R Water rating shown based on piping and pickup allowance of 1.15. Consult manufacturer before selecting
boiler for installations having unusual piping and pickup requirements, such as intermittent system operation,
extensive piping systems, etc.
(5)
2 Section boiler equipped with 3” diameter fl ue collar. Use 3” x 4” increaser fi tting to install furnished 4” vent damper.
H
Ratings marked “Net I=B=R Ratings” indicate amount
of remaining heat input that can be used to heat the
radiation or terminal units. Net I=B=R Ratings shown
are based on allowance of 1.15 in accordance with
factors shown on the I=B=R Standard as published by
The Hydronics Institute.
Selection of boiler size should be based upon “Net
I=B=R Rating” being equal to or greater than
calculated heat loss of the building.
Consult manufacturer before selecting boiler for
installations having unusual piping and pickup
requirements.
These boilers must stand on non-combustible fl oor. If
installed on combustible fl oor, use Combustible Floor
Base Number 42135-1 or 146-14-031 (2-6 section
boilers) or 42135-2 or 146-14-032 (7-9 section
boilers).
BOILERS FOR USE AT HIGH ALTITUDE
Boiler is factory equipped for use at altitudes of
0-2,000 feet above sea level. For use at altitudes
above 2,000 feet above sea level, input ratings are
reduced by change in main burner orifi ce size.
For altitudes above 2,000 feet above sea level, input
ratings should be reduced at rate of 4% for each
1,000 feet above sea level. Consult National Fuel
Gas Code (NFPA 54/ANSI Z223.1), or manufacturer
for correct orifi ce sizing information. High altitude
orifi ces are available from boiler manufacturer.
NATURAL AND PROPANE GAS RATINGS
BASIC BOILER UNIT NO.
Number
of
Sections
Input
MBH
(1,2)
Heating
Capacity
MBH
(1,3)
Net I=B=R
Rating
MBH
(1,4)
Dimensions (Inches)
Electronic Ignition
With Vent Damper
Continuous Pilot
With Vent Damper
Flue
Diameter
“A”
Width
PWB-2D PVWB-2D
2 37.5 30 26
3)
48
PWB-3D PVWB-3D
3705750 511¼
PWB-4D PVWB-4D
4 105 85 74 6 14½
PWB-5D PVWB-5D
5 140 113 98 6 17¾
PWB-6D PVWB-6D
6 175 142 123 7 21
PWB-7D PVWB-7D
7 210 170 148 7 24¼
PWB-8D PVWB-8D
8 245 198 172 7 27½
PWB-9D PVWB-9D
9 280 226 197 7 30¾
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