Technical Data - Bosch SSB255 Installation And Service Manual
Buderus ssb boiler
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Also See for SSB255:
- Control operations manual (28 pages) ,
- Technical service bulletin (4 pages)
Table of Contents
10 | Product description
2 .7
Technical data
Boiler Category
Type of Gas
Max input rate
Min input rate
Turndown
Gas Connections (NPT)
Max. NG Pressure
Min. NG Pressure
Max. LPG Pressure
Min. LPG Pressure
Water Connections
Max. Allowable Working Pressure
(MAWP)
Recommended water flow @ max
power (∆T 36 °F / 20 °C)
Max water flow @ max power
(∆T 27 °F / 15 °C)
Min water flow @ max power
(∆T 54 °F / 30 °C)
Min water flow @ min power
(∆T 27 °F / 15 °C)
Water Pressure Drop @
recommended water flow
Water Pressure Drop @ max water
flow
Water Volume
Vent/Air Intake Connections
Vent Materials
Max operating temperature
Max HE allowable temperature
Ambient storage temperature dry
Ambient functioning temperature
Ambient Relative Humidity [RH]
Surface area heat exchanger
Standard Listings & Approvals
Electrical Req. 120VAC/1PH/60Hz
Noise rating
Weight (dry)
Min. clearance to combustibles ***
Dimension WxHxD
AHRI certified ratings
Input
Heating Capacity
Gross Output
AFUE
Combustion Efficiency
Thermal efficiency
Net rating
CO
2
(*) With conversion.
(**) FLA (Full Load Amperage) - maximum current drawn by the boiler without pumps.
(***) The 2" minimum clearance is required for all sides of the boiler. The boiler may be installed on combustible (wood) floors excluding carpets.
See Fig. 9 for minimum clearance recommendation for serviceability.
6720818454 (2016/02) US
Unit
SSB255
ASME Sect.IV
Natural Gas, Propane *
BTU/hr (kW)
255,900 (75)
BTU/hr (kW)
51,180 (15)
Rate (%)
5:1 (20 %)
Ø Inch
Inch W.C. (mbar)
10.5 (26.15)
Inch W.C. (mbar)
3.5 (8.72)
Inch W.C. (mbar)
13 (32.3)
Inch W.C. (mbar)
8 (19.9)
Ø Inch
1 ½ "
PSI (bar)
80 (5.5)
GPM (m
/h)
14.2 (3.2)
3
GPM (m
/h)
18.9 (4.3)
3
GPM (m
/h)
9.5 (2.2)
3
GPM (m
/h)
3.8 (0.9)
3
Feet Head (mbar)
3.8 (114)
Feet Head (mbar)
6.4 (190)
Gallon (liter)
4.0 (15.2)
Ø Inch (Ø mm)
3 (80)
CPVC, PVC, PP, PP Flex,
Stainless Steel AL29-4C
IPEX type IIA & IIB
°F (°C)
194 (90)
°F (°C)
210 (98.9)
°F (°C)
5 to 150 (-15 to 65)
°F (°C)
32 to 120 (0 to 49)
% RH
Minimum 30%, Maximum 90% Minimum 30%, Maximum 90% Minimum 30%, Maximum 90%
SQFT (m
)
22.0 (2.0)
2
CSA, ASME, AHRI
2 FLA**
dB
lbs (kg)
198 (90)
Inch (mm)
2" (50.8)
Inch
23 31/32" x 61 9/16" x 21 21/32"
(mm)
(609x1564x550)
Unit
SSB255
MBH
255
MBH
237.0
MBH
%
%
%
MBH
206.0
%
10.2
SSB399
ASME Sect.IV
Natural Gas, Propane *
399,000 (117)
79,800 (23.4)
5:1 (20 %)
1"
1''
10.5 (26.15)
3.5 (8.72)
13 (32.3)
8 (19.9)
1 ½"
80 (5.5)
22.2 (5.0)
29.5 (6.7)
14.8 (3.4)
5.9 (1.3)
8.3 (250)
13.8 (410)
4.5 (17.0)
4 (100)
CPVC, PVC, PP, PP Flex,
Stainless Steel AL29-4C
IPEX type IIA & IIB
194 (90)
210 (98.9)
5 to 150 (-15 to 65)
32 to 120 (0 to 49)
27.2 (2.5)
CSA, ASME, AHRI
2.5 FLA**
46
47
220 (100)
2" (50.8)
23 31/32" x 61 9/16" x 21 21/32"
(609x1564x550)
SSB399
399
n/a
n/a
386.0
96
n/a
n/a
97.6
n/a
96.9
336.0
10.1
SSB512
ASME Sect.IV
Natural Gas, Propane *
512,000 (150)
102,400 (30)
5:1 (20 %)
1''
10.5 (26.15)
3.5 (8.72)
13 (32.3)
8 (19.9)
2''
80 (5.5)
28.4 (6.5)
37.9 (8.6)
18.9 (4.3)
7.6 (1.7)
21.7 (650)
37.73 (1120)
6.0 (23.0)
4 (100)
CPVC, PVC, PP, PP Flex,
Stainless Steel AL29-4C
IPEX type IIA & IIB
194 (90)
210 (98.9)
5 to 150 (-15 to 65)
32 to 120 (0 to 49)
43.0 (4.0)
CSA, ASME, AHRI
2.5 FLA**
48
242 (110)
2" (50.8)
23 31/32" x 61 9/16" x 21 21/32"
(609x1564x550)
SSB512
511.8
n/a
495.0
n/a
95.4
96.8
430.0
9.5
SSB
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