Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The SSB800 Gen 1 and Gen 2 print identical ratings - 79,800 to 798,000 BTU/hr, 97.6% combustion efficiency, 96.8% thermal efficiency, 772,000 BTU/hr gross output - and the same 743 lb cabinet. The generation change is in materials and components: Gen 1 uses dual 316L stainless steel heat exchangers, Gen 2 dual 441 stainless steel, plus a Honeywell Rambler gas valve, Grundfos 43-110F pump and revised condensate collector.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus SSB800 (Gen 1) | Buderus SSB800 (Gen 2) |
|---|---|---|
| Input, maximum | 798 MBH | 798 MBH |
| Input, minimum | 79.8 MBH | 79.8 MBH |
| Turndown | 10:1 | 10:1 |
| Combustion efficiency (AHRI) | 97.6 % | 97.6 % |
| Thermal efficiency (AHRI) | 96.8 % | 96.8 % |
| Gross output (AHRI) | 772 MBH | 772 MBH |
| Net rating (AHRI) | 671.3 MBH | 671.3 MBH |
| Water volume | 13 gal | 13 gal |
| Weight, dry | 743 lb | 743 lb |
| Gas connection | 2" NPT | 2" NPT |
| Water connections | 3" | 3" |
| Dimensions (L × W × H) | 31.5 × 35.4 × 70.9 in (800 × 900 × 1800 mm) | 31.5 × 35.4 × 70.9 in (800 × 900 × 1800 mm) |
The two engineering submittal sheets print the same General, Performance and Operational Data for the SSB800: 54 sq ft of heat-exchanger surface, 2" NPT gas, 3" water, 6" vent/air, 13.0 gal water, 743 lb dry / 836 lb shipping, 80 psi MAWP and 15.1 FLA.
The documented differences are the heat-exchanger material (316L on Gen 1, 441 on Gen 2) and the component set Bosch describes on the Gen 2 product page: dual 441 heat exchangers for higher corrosion resistance, a new Honeywell Rambler gas valve, a Grundfos 43-110F 115/230 V pump and an improved condensate collector with integrated clapet valve. Gen 1 uses a multi-speed circulator pump per module.
Both generations are current catalog products - Bosch's Canadian condensing category lists 'SSB Gen 1' and 'SSB Gen 2' side by side, with Gen 2 marked NEW - and both carry a non-prorated 10-year heat-exchanger warranty. When ordering parts or service, identify the generation from the rating plate and use the matching manual.
Bosch Thermotechnology
The Buderus SSB800 (Gen 1) is a commercial condensing boiler module rated 798 MBH maximum input (79.8 MBH minimum) with 96.8% AHRI thermal efficiency, 772 MBH gross output and 743 lb dry weight.
Bosch Thermotechnology
The Buderus SSB800 (Gen 2) is a commercial condensing boiler module rated 798 MBH maximum input (79.8 MBH minimum) with 96.8% AHRI thermal efficiency, 772 MBH gross output and 743 lb dry weight.
The submittal sheets print identical ratings: 79,800-798,000 BTU/hr input, 97.6% combustion efficiency, 96.8% thermal efficiency, 772,000 BTU/hr gross output and 671,300 BTU/hr net rating.
The rating plate, the installation manual revision (10.2020 for Gen 1, 01.2024 for Gen 2) and the heat-exchanger material: 316L indicates Gen 1, 441 indicates Gen 2. Gen 2 also carries the Honeywell Rambler gas valve and Grundfos 43-110F pump.
Yes. Bosch's Canadian condensing category lists both SSB Gen 1 and SSB Gen 2 as current products, with Gen 2 marked NEW.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.