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Number
Firing
Models
of
Rate
Sections
[GPH]
TRB4075
4
0.75
TRB4090
4
0.90
TRB5100
5
1.00
TRB5120
5
1.20
TRB6130
6
1.30
TRB6145
6
1.45
TRB7165
7
1.65
TRB7180
7
1.80
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 0.90 GPH, 13.2% CO2 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
Input
AHRI
Capacity
[Mbh]
Rating
[Mbh]
[Mbh]
105
92
80
126
110
96
140
123
107
168
148
129
182
160
139
203
178
155
231
202
176
252
220
191
Min.
*MAWP
Relief
AFUE
Water
Valve
[%]
[psi]
Capacity
[Mbh]
65
87.0
140
65
86.0
140
65
87.0
175
65
86.0
175
65
87.0
210
65
86.0
210
65
87.0
245
65
86.0
245
10
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
6
6¾
250
7
6¾
250
7
6¾
PN 240013415 REV A [08/15/2021]
Flue
Size
[Inches]
5
5
5
5
5
5
6
6
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