Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Buderus SB625WS 160 and Buderus SB625WS 220 are two condensing boilers from the Bosch Thermotechnology Buderus SB625WS line. Published ratings: Buderus SB625WS 160 at 563 MBH rated input, natural gas and 532 MBH gross output; Buderus SB625WS 220 at 788 MBH rated input, natural gas and 745 MBH gross output. Buderus SB625WS 220 lists 225 MBH more rated input, natural gas than Buderus SB625WS 160 (788 MBH against 563 MBH). Buderus SB625WS 220 lists 15 kg more shipping weight than Buderus SB625WS 160 (590 kg against 575 kg).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus SB625WS 160 | Buderus SB625WS 220 |
|---|---|---|
| Weight of boiler | 575 kg | 590 kg |
| Fuels | Natural gas or #2 oil | Natural gas or #2 oil |
| Rated input, natural gas | 563 MBH | 788 MBH |
| Rated input, #2 oil | 4 GPH | 5.6 GPH |
| Gross output | 532 MBH | 745 MBH |
| Maximum working pressure | 80 psi | 80 psi |
| Maximum admissible temperature | 230 °F | 230 °F |
| Maximum working temperature | 210 °F | 210 °F |
| Water capacity | 85.3 US gal | 95.1 US gal |
| Heat exchanger surface area | 65.65 sq ft | 94.72 sq ft |
Published ratings: the Buderus SB625WS 160 is rated 563 MBH rated input, natural gas and 532 MBH gross output; the Buderus SB625WS 220 is rated 788 MBH rated input, natural gas and 745 MBH gross output. Buderus SB625WS 220 lists 225 MBH more rated input, natural gas than Buderus SB625WS 160 (788 MBH against 563 MBH).
Buderus SB625WS 220 lists 15 kg more shipping weight than Buderus SB625WS 160 (590 kg against 575 kg). The water capacity differs: the Buderus SB625WS 160 lists 85.3 US gal, while the Buderus SB625WS 220 lists 95.1 US gal. The heat exchanger surface area differs: the Buderus SB625WS 160 lists 65.65 sq ft, while the Buderus SB625WS 220 lists 94.72 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 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.
The Buderus SB625WS 220 lists 788 MBH, against 563 MBH on the Buderus SB625WS 160, per the cited documentation.
The Buderus SB625WS 220 lists 745 MBH, against 532 MBH on the Buderus SB625WS 160.
It ships at 590 kg against 575 kg for the Buderus SB625WS 160, 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.