10
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.
Table 1 - RATINGS & CAPACITIES
OIL-FIRED HOT WATER BOILERS
Models
Number
of
Sections
Firing
Rate
[GPH]
Input
[Mbh]
Heating
Capacity
[Mbh]
Net
AHRI
Rating
[Mbh]
*MAWP
Water
[psi]
AFUE
[%]
Min.
Relief
Valve
Capacity
[Mbh]
Max.
Water
Temp
[°F]
Chimney
Liner
Size
Round
[Inches]
Chimney
Liner
Size
Square
[Inches]
Flue
Size
[Inches]
TRB4075
4
0.75
105
92
80
65
87.0
140
250
6
6¾
5
TRB4090
4
0.90
126
110
96
65
86.0
140
250
6
6¾
5
TRB5100
5
1.00
140
123
107
65
87.0
175
250
6
6¾
5
TRB5120
5
1.20
168
148
129
65
86.0
175
250
6
6¾
5
TRB6130
6
1.30
182
160
139
65
87.0
210
250
6
6¾
5
TRB6145
6
1.45
203
178
155
65
86.0
210
250
6
6¾
5
TRB7165
7
1.65
231
202
176
65
87.0
245
250
7
6¾
6
TRB7180
7
1.80
252
220
191
65
86.0
245
250
7
6¾
6
4 - RATINGS & CAPACITIES
PN 240013415 REV A [08/15/2021]
