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Number
Firing
Input
of
Rate
[Mbh]
Sections
[GPH]
4
0.75
105
4
0.95
133
4
1.10
154
5
1.00
140
5
1.15
161
5
1.35
189
6
1.30
182
6
1.45
203
6
1.65
231
7
1.65
231
7
1.80
252
7
1.90
266
GPH = U.S. Gallons per Hour
Mbh = 1000 Btu (British thermal units) per hour.
psi = Pounds per square inch
*MAWP = Maximum allowable working pressure. This low pressure oil fired hot water boiler is constructed and
hydrostatically tested for maximum working pressure of 65 psi in accordance with the latest revision of the A.S.M.E.
(American Society of Mechanical Engineers) Boiler and Pressure Vessel Code Section IV Standards for heating boilers.
AFUE= Annual Fuel Utilization Efficiency
Heating Capacity and AFUE based on 13.1% CO2 (13.5% CO2 at 0.95 GPH and 1.10 GPH, 13.2% CO2 on 7 section at
1.65 GPH), -0.02" w.c. draft in breech, and # 1 smoke or less. Testing is done in accordance with U.S. DOE (Department
of Energy) test procedure.
Heating Capacity indicates amount of heat available after subtracting losses up the stack. Remaining heat is available
to heat water. Small portion is heat from jacket and surfaces of boiler and this heat stays in structure. Net AHRI rating
represents portion of remaining heat applied to heat radiation or terminal units (i.e. finned tube baseboard, cast iron
radiators, radiant floor, etc.). 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 system piping. Net
AHRI ratings shown are based on piping and pickup factor of 15% in accordance with AHRI Standard as published by
Hydronics Institute.
Net AHRI rating of boiler selected should be greater than or equal to calculated peak heating load (heat loss) for building
or area(s) served by boiler and associated hot water heating systems. Consult manufacturer before selecting boiler for
installations having unusual piping and pickup requirements.
4 - RATINGS & CAPACITIES
Table 1 - RATINGS & CAPACITIES
OIL-FIRED HOT WATER BOILERS
Net
Heating
*MAWP
AHRI
Capacity
Water
Rating
[Mbh]
[psi]
[Mbh]
92
80
114
99
132
115
123
107
139
121
161
140
160
139
176
153
198
172
202
176
217
189
228
198
Min.
relief
AFUE
Valve
[%]
Capacity
[Mbh]
65
87.0
92
65
85.0
115
65
84.0
132
65
87.0
123
65
85.0
139
65
84.0
161
65
87.0
160
65
85.0
176
65
84.0
198
65
87.0
202
65
85.0
217
65
84.0
227
8
Chimney
Chimney
Max.
Liner
Liner
Water
Size
Size
Temp
Round
Square
[°F]
[Inches]
[Inches]
250
6
6¾
250
6
6¾
250
6
6¾
250
6
6¾
250
6
6¾
250
7
6¾
250
6
6¾
250
7
6¾
250
7
6¾
250
7
6¾
250
7
6¾
250
8
6¾
PN 240011579 REV D [08/01/2018]
Flue
Size
[Inches]
5
5
5
5
5
5
5
5
5
6
5
5
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