Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the Buderus SB625WS 290 and the Buderus SB625WS 370 belong to the Bosch Thermotechnology Buderus SB625WS line of condensing boilers. Published ratings: Buderus SB625WS 290 at 1,014 MBH rated input, natural gas and 959 MBH gross output; Buderus SB625WS 370 at 1,314 MBH rated input, natural gas and 1,243 MBH gross output. Buderus SB625WS 370 lists 300 MBH more rated input, natural gas than Buderus SB625WS 290 (1,314 MBH against 1,014 MBH). Buderus SB625WS 370 lists 50 kg more shipping weight than Buderus SB625WS 290 (810 kg against 760 kg).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus SB625WS 290 | Buderus SB625WS 370 |
|---|---|---|
| Weight of boiler | 760 kg | 810 kg |
| Fuels | Natural gas or #2 oil | Natural gas or #2 oil |
| Rated input, natural gas | 1,014 MBH | 1,314 MBH |
| Rated input, #2 oil | 7.2 GPH | 9.3 GPH |
| Gross output | 959 MBH | 1,243 MBH |
| Maximum working pressure | 80 psi | 80 psi |
| Maximum admissible temperature | 230 °F | 230 °F |
| Maximum working temperature | 210 °F | 210 °F |
| Water capacity | 130.7 US gal | 146.6 US gal |
| Heat exchanger surface area | 139.93 sq ft | 175.45 sq ft |
Published ratings: the Buderus SB625WS 290 is rated 1,014 MBH rated input, natural gas and 959 MBH gross output; the Buderus SB625WS 370 is rated 1,314 MBH rated input, natural gas and 1,243 MBH gross output. Buderus SB625WS 370 lists 300 MBH more rated input, natural gas than Buderus SB625WS 290 (1,314 MBH against 1,014 MBH).
Buderus SB625WS 370 lists 50 kg more shipping weight than Buderus SB625WS 290 (810 kg against 760 kg). The water capacity differs: the Buderus SB625WS 290 lists 130.7 US gal, while the Buderus SB625WS 370 lists 146.6 US gal. The heat exchanger surface area differs: the Buderus SB625WS 290 lists 139.93 sq ft, while the Buderus SB625WS 370 lists 175.45 sq ft.
Both records print the same fuel (Natural gas or #2 oil), maximum working pressure (80 psi), maximum admissible temperature (230 °F) and maximum working temperature (210 °F), per the cited sources.
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.
The Buderus SB625WS 370 lists 1,314 MBH, against 1,014 MBH on the Buderus SB625WS 290, per the cited documentation.
The Buderus SB625WS 370 lists 1,243 MBH, against 959 MBH on the Buderus SB625WS 290.
It ships at 810 kg against 760 kg for the Buderus SB625WS 290, per the cited sources.
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.