Bosch Thermotechnology · Buderus SB745WS
Buderus SB745WS 800
The Buderus SB745WS 800 is a discontinued commercial stainless steel condensing boiler block rated 3,003 MBH natural-gas input (21.4 GPH oil) with 2,846 MBH gross output and 348.7 US gal water capacity.
Key figures
- Max input
- —
- Max CSA output
- —
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Buderus SB745WS 800 in practice
Best suited to
Applicability and support
- Model number
- SB745WS 800
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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.
Specifications
Published specifications
Values as published by Bosch Thermotechnology. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Rated input, natural gas | 3,003 MBH | Values obtained with RS.../M burners per the manual technical table. |
| Rated input, #2 oil | 21.4 GPH | 81 l/h. |
| Output | ||
| Gross output | 2,846 MBH | 834 kW class per the technical table. |
| Physical and connections | ||
| Maximum working pressure | 80 psi | 80 psi (5.5 bar). |
| Maximum admissible temperature | 230 °F | 110 °C. |
| Maximum working temperature | 210 °F | 98.8 °C. |
| Water capacity | 348.7 US gal | 1320 l. |
| Weight of boiler | 1,890 kg | 4,167 lb calculated from the manual's printed kg value. |
| Heat exchanger surface area | 426.25 sq ft | 39.6 m². |
| Operating limits and other | ||
| Fuels | Natural gas or #2 oil | Boiler block sold with a field-supplied burner; only UL-listed burners may be used. |
Manuals
Alerts documented for this model
None documented yet.
Questions about the Buderus SB745WS 800?
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
- Bosch Home Comfort US — Buderus SB745WS Boiler (discontinued) · accessed September 9, 2026
- SB625WS/SB745WS Installation Instructions (6 720 805 218) · accessed September 9, 2026
- SB625-745WS Recommended Burners Engineering Submittal Sheet (BTC 437008107 D) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.