Product Overview
The Bosch Buderus SSB Series (SSB800, SSB1000, SSB1000TL) Gen 2 are stainless steel condensing hot water boilers designed for direct venting. They are suitable for large residential, commercial, and light industrial applications.
Key features include:
- Dual plasma welded 441 stainless steel heat exchanger modules.
- True on-board redundancy with independent fan motor, gas valve, burner tube, and circulator for each module.
- Isolation valves and drain for independent service.
- Constructed, tested, and labeled in accordance with ASME Section IV, with ASME stamp.
- CSA approved for USA and Canada.
- Maximum Allowable Working Pressure (MAWP) of 80 psig for heat exchanger modules.
- Integrated pressure sensor, low water cut-out (LWCO) with test button, and individual flow sensors per module.
- Up to 40:1 turndown ratio.
- Settable Power Mode for parallel or serial operation of up to 8 modules.
- Equipped with a 75 lb. pressure relief valve per boiler module.
- Manual Reset High Limits (MRHL).
Engineering Specifications
The boilers are factory set for Natural Gas but field convertible to LP Gas using a supplied kit.
Safety features include Low and High gas pressure switches with manual resets per ASME CSD-1 requirements.
Vent configurations can be twin-pipe, concentric, or single-pipe for vertical or horizontal termination.
Installation requires adherence to water quality standards outlined in the boiler installation manual.
Boilers function directly with hydronic emitters and can be controlled via "dry" closure contacts (e.g., relay, BMS system).
An optional outdoor air temperature sensor can be used to control supply water temperature for increased fuel efficiency.
The on-board 7" color touch-screen allows for multiple heating configurations, including set point operation, outdoor reset (demand signal, full outdoor reset with constant circulation), permanent heat demand, and analog 0-10 Vdc (4-20 mA) setpoint control.
Domestic hot water heating parameters are available, supporting indirect tank control via a 10k ohm NTC thermistor or field-supplied aquastat.
Hydraulic manifold piping (water, gas, exhaust/air) is factory installed and self-contained within the outer cabinet. External connections can be made on either the left or right side for installation flexibility.
The SSB series can be installed in combinations of 2, 3, or 4 TL modules, supporting turndown ratios of 20:1, 30:1, and 40:1 respectively. Up to 4 boilers can be interconnected using provided flanged connections, with manifold piping engineered to accommodate these requirements.
Each module is equipped with a multi-speed circulator pump.
General Data
| Boiler category | Unit | SSB800 | SSB1000 | SSB1000TL |
|---|---|---|---|---|
| Type of Gas | - | Natural Gas, Propane | Natural Gas, Propane | Natural Gas, Propane |
| Heat exchanger construction | - | 441 Stainless Steel | 441 Stainless Steel | 441 Stainless Steel |
| Surface heat exchanger (total) | Sq. Ft (m2) | 54 (5.0) | 86 (8.0) | 86 (8.0) |
| Gas Connections | Inch | 2" NPT | 2" NPT | 3" Flanged |
| Water Connections | Inch | 3 | 3 | 5 |
| Vent/Air Intake Connections | Inch (Ø mm) | 6 (160) | 6 (160) | 10 (254) |
| Vent Materials | - | CPVC, PP, Stainless Steel AL29-4C | CPVC, PP, Stainless Steel AL29-4C | PP, Stainless Steel AL29-4C |
| Water Volume | Gallons (Liters) | 13.0 (50) | 16.0 (60) | 20.0 (75) |
| Weight - dry | Lbs (kg) | 743 (337) | 787 (357) | 849 (385) |
| Shipping Weight | Lbs (kg) | 836 (379) | 880 (399) | 941 (427) |
| Min. clearance to combustibles ** | Inch (mm) | 12 (305) | 12 (305) | 12 (305) |
| Dimension LxWxH | Inch (mm) | 31.5 x 35.4 x 70.9 (800x900x1800) | 31.5 x 35.4 x 70.9 (800x900x1800) | 31.5 x 35.4 x 70.9 (800x900x1800) |
** The 2" minimum clearance is required for all sides of the boiler. The boiler may be installed on combustible (wood) floors excluding carpets.
Performance Data
| Unit | SSB800 | SSB1000 | SSB1000TL | |
|---|---|---|---|---|
| Max Input* | BTU/hr (kW) | 798,000 (234) | 1,024,000 (300) | 1,024,000 (300) |
| Min Input | BTU/hr (kW) | 79,800 (23) | 100,000 (29) | 100,000 (29) |
| Turndown | Ratio (%) | 10:1 (10%) | 10:1 (10%) | 10:1 (10%) |
| Combustion Eff.* | Efficiency (%) | 97.6 | 95.4 | 95.4 |
| Thermal Eff.* | Efficiency (%) | 96.8 | 96.8 | 96.8 |
| Gross Output* | BTU/hr (kW) | 772,000 (226) | 991,000 (290) | 991,000 (290) |
| Net Rating* | BTU/hr (kW) | 671,300 (197) | 861,700 (252) | 861,700 (252) |
* = AHRI certified performance data
Operational Data
| Unit | SSB800 | SSB1000 | SSB1000TL | |
|---|---|---|---|---|
| Max. NG pressure | Inch W.C. (mbar) | 20 (50) | 20 (50) | 20 (50) |
| Min. NG pressure | Inch W.C. (mbar) | 3.5 (8.72) | 3.5 (8.72) | 3.5 (8.72) |
| Max. LPG pressure | Inch W.C. (mbar) | 20 (50) | 20 (50) | 20 (50) |
| Min. LPG pressure | Inch W.C. (mbar) | 8 (19.9) | 8 (19.9) | 8 (19.9) |
| CO2 working range NG (LP) | % | 8.5-9.5 (10.3 - 10.7) | 8.5-9.5 (10.3 - 10.7) | 8.5-9.5 (10.3 - 10.7) |
| Max. allowable working pressure (MAWP) | PSI (bar) | 80 (5.5) | 80 (5.5) | 80 (5.5) |
| Recommended water flow at max power (AT 36 °F / 20 °C) | GPM (m3/h) | 44.4 (10.0) | 56.8 (12.9) | 56.8 (12.9) |
| Water pressure drop @ recommended water flow | Feet Head (mbar) | 19 (568) | 28 (837) | 25 (747) |
| Max. operating temperature | °F (°C) | 194 (90) | 194 (90) | 194 (90) |
| Max HE allowable temperature | °F (°C) | 210 (98.9) | 210 (98.9) | 210 (98.9) |
| Ambient storage temperature dry | °F (°C) | 5 to 158 (-15 to 70) | 5 to 158 (-15 to 70) | 5 to 158 (-15 to 70) |
| Ambient functioning temperature | °F (°C) | 32 to 120 (0 to 49) | 32 to 120 (0 to 49) | 32 to 120 (0 to 49) |
| Electrical Req. 120VAC/1PH/60Hz | - | 15.1 FLA * | 15.1 FLA* | 15.1 FLA * |
* FLA (Full Load Amperage) - maximum current drawn by the boiler if all pumps reach rated horsepower.
Approval Data
| Approval description | SSB800 | SSB1000 | SSB1000TL |
|---|---|---|---|
| Standard listings & approvals | CSA, ASME, AHRI | CSA, ASME, AHRI | CSA, ASME, AHRI |
| Massachusetts Plumbing Board | Approved | Approved | Approved |
| CRN # | Z0467.2CL | Y9641.2C | Y9641.2C |
| SCAQMD approval | Approved | Approved | Approved |
Dimensions
The following diagrams illustrate the physical dimensions of the boilers.
SSB800/SSB1000 Boiler Dimensions
Overall Dimensions:
- Height: 70.86 inches (1800 mm)
- Width: 31.49 inches (800 mm)
- Depth: 35.43 inches (900 mm)
Key Connection Port Locations (approximate):
- Gas Inlet: Ø2.00 inches (51 mm)
- Flue/Air Intake: Ø6.30 inches (160 mm)
- System Supply/Return: Ø3.00 inches (76 mm)
Tolerances on all dimensions shown are +/- 1/4" (6.35mm).
SSB1000TL Boiler Dimensions
Overall Dimensions:
- Height: 70.86 inches (1800 mm)
- Width: 31.49 inches (800 mm)
- Depth: 35.43 inches (900 mm)
Key Connection Port Locations (approximate):
- Gas Inlet: Ø3.00 inches (76 mm)
- Flue/Air Intake: Ø9.84 inches (250 mm)
- System Supply/Return: Ø5.00 inches (127 mm)
Tolerances on all dimensions shown are +/- 1/4" (6.35mm).
Boiler Connections
The diagram below indicates the location and type of various boiler connections.
| Item | Description | Unit | SSB800 | SSB1000 | SSB1000TL |
|---|---|---|---|---|---|
| A | Gas Inlet | Inch | 2" male NPT | 2" male NPT | 3" Flanged |
| B | Flue Exhaust (Flanged) | Inch (mm) | 6 (160) | 6 (160) | 10 (254) |
| C | Air Intake | Inch (mm) | 6 (160) | 6 (160) | 10 (254) |
| D | System Supply (Flanged) | Inch (mm) | 3 (76) | 3 (76) | 5 (127) |
| E | System Return (Flanged) | Inch (mm) | 3 (76) | 3 (76) | 5 (127) |
| F | Condensate Outlet | Inch (mm) | 1-1/2 (50) | 1-1/2 (50) | 1-1/2 (50) |
| G | Relief Valve Outlet | Inch (mm) | 2 (60) | 2 (60) | 2 (60) |
Performance Curves
Thermal Efficiency Curves
The thermal efficiency curves illustrate the relationship between thermal efficiency and return water temperature for the SSB800, SSB1000, and SSB1000TL boilers at different input levels (100%, 30%, and 20%). Generally, thermal efficiency decreases as the return water temperature increases, with a 36°F (20°C) temperature rise.
Water Pressure Drop Curves
The water pressure drop curves show the pressure loss across the boiler as a function of flow rate (GPM/LPM) for each model (SSB800, SSB1000, SSB1000TL). These curves are important for system design and pump selection. The curves indicate that pressure drop increases significantly with higher flow rates.
Clearances
Recommended Service Clearances
Service Clearances:
- Front: 24 inches (610mm)
- Sides: 12 inches (305mm) (excluding side with connections)
- Top/Bottom: 74.80 inches (1900mm) Height, 31.49 inches (800mm) Width, 35.43 inches (900mm) Depth (referencing the overall unit dimensions for context). The diagram shows 20" (508mm) front clearance and 24" (610mm) side clearance for service access.
Required Clearance from Combustibles
Clearances from Combustibles:
- Front: 2 inches (51mm)
- Sides: 12 inches (305mm)
- Top/Bottom: 6 inches (153mm)
Note: The disclaimer states that dimensions shown on submittal sheets are for reference only and should not be used for field installation. Refer to current product installation manuals for detailed instructions.
Disclaimer
Specifications are subject to change without notice. All dimensions shown on these engineering submittal sheets are for reference only and should not be used for field installation purposes. Please refer to current product installation manuals for detailed installation instructions and dimensions.
