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Bosch Thermotechnology · Series
The Buderus SB625WS is a discontinued stainless steel commercial condensing boiler block sold in six sizes (160, 220, 290, 370, 480, 640) with 563 to 2,200 MBH natural-gas input, 532 to 2,081 MBH gross output and 85.3 to 203.4 US gallons of water. It appears on Bosch's US 'Discontinued Boilers' page.
Series facts
The SB625WS is a stainless steel condensing boiler with a lightly pressurized combustion chamber and turbulators in the tube bundle, designed to condense flue gas in commercial mechanical rooms. The installation manual's technical table lists six sizes: 160 (563 MBH NG input, 532 gross output, 85.3 gal water), 220 (788 / 745 / 95.1), 290 (1,014 / 959 / 130.7), 370 (1,314 / 1,243 / 146.6), 480 (1,689 / 1,598 / 196.2) and 640 (2,200 / 2,081 / 203.4). All sizes are 80 psi maximum working pressure with 210 °F maximum working temperature.
The SB625WS is discontinued: it has its own product page under Bosch's US 'Discontinued Boilers' section, and its installation/operating manuals and UL-listed burner sheet remain online. It is a boiler block that needs a field-supplied burner; the burner sheet groups approved Riello gas and dual-fuel burners by size and states the boiler may only be sold with burners included in the UL listing. Boilers.ca notes the relationship to the later SSB family (series-bosch-ssb), which replaced the SB series in the commercial condensing catalog.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Bosch Thermotechnology
The Buderus SB625WS 160 is a discontinued commercial stainless steel condensing boiler block rated 563 MBH natural-gas input (4 GPH oil) with 532 MBH gross output and 85.3 US gal water capacity.
Bosch Thermotechnology
The Buderus SB625WS 220 is a discontinued commercial stainless steel condensing boiler block rated 788 MBH natural-gas input (5.6 GPH oil) with 745 MBH gross output and 95.1 US gal water capacity.
Bosch Thermotechnology
The Buderus SB625WS 290 is a discontinued commercial stainless steel condensing boiler block rated 1,014 MBH natural-gas input (7.2 GPH oil) with 959 MBH gross output and 130.7 US gal water capacity.
Bosch Thermotechnology
The Buderus SB625WS 370 is a discontinued commercial stainless steel condensing boiler block rated 1,314 MBH natural-gas input (9.3 GPH oil) with 1,243 MBH gross output and 146.6 US gal water capacity.
Bosch Thermotechnology
The Buderus SB625WS 480 is a discontinued commercial stainless steel condensing boiler block rated 1,689 MBH natural-gas input (12 GPH oil) with 1,598 MBH gross output and 196.2 US gal water capacity.
Bosch Thermotechnology
The Buderus SB625WS 640 is a discontinued commercial stainless steel condensing boiler block rated 2,200 MBH natural-gas input (15.7 GPH oil) with 2,081 MBH gross output and 203.4 US gal water capacity.
| Specification | Buderus SB625WS 160 | Buderus SB625WS 220 | Buderus SB625WS 290 | Buderus SB625WS 370 | Buderus SB625WS 480 | Buderus SB625WS 640 |
|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — |
| input-max | — | — | — | — | — | — |
| output-max | — | — | — | — | — | — |
| afue | — | — | — | — | — | — |
| turndown | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — |
| Weight of boiler | 575 kg | 590 kg | 760 kg | 810 kg | 1,235 kg | 1,345 kg |
Read the full comparison: Buderus SB625WS 160 vs SB625WS 640 →
Read the full comparison: Buderus SB625WS 160 vs SB625WS 220 →
Read the full comparison: Buderus SB625WS 220 vs SB625WS 290 →
Read the full comparison: Buderus SB625WS 290 vs SB625WS 370 →
Error codes and alerts
No alerts documented for this series yet.
Manuals
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Services for Bosch Thermotechnology boilers
No. It appears on Bosch's US 'Discontinued Boilers' page with its manuals, and it is no longer in the current commercial catalog; the Buderus SSB family is the current commercial condensing line.
Only burners included in the UL listing: Bosch's recommended-burners engineering submittal sheet groups approved Riello gas and dual-fuel models by size and states that using any other burner requires a UL field evaluation before commissioning.
The 640 size holds 203.4 US gallons (770 l), per the installation manual technical table.
Describe what the boiler is doing and get a straight answer about the next step.
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.