Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The B2HB 45, 160 and B2HB 57, 199 are the two large-chassis models and are physically identical: 210 lb (95 kg), 3.85 USG of water, 60 psig and the same cabinet, both firing from 32 MBH natural gas at 95.0% AFUE. The 57, 199 simply fires higher — 199 against 160 MBH — for a 160 MBH Net AHRI rating against 127.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 200-W B2HB 45, 160 | Viessmann Vitodens 200-W B2HB 57, 199 |
|---|---|---|
| CSA input, minimum (natural gas) | 32 MBH | 32 MBH |
| CSA input, maximum (natural gas) | 160 MBH | 199 MBH |
| CSA input (liquid propane) | 60-160 MBH | 60-199 MBH |
| CSA output / DOE heating capacity (natural gas) | 30-149 MBH | 30-185 MBH |
| Net AHRI rating | 127 MBH | 160 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Weight | 210 lb | 210 lb |
| Boiler water content | 3.85 USG | 3.85 USG |
| Maximum operating pressure | 60 psig | 60 psig |
The 45, 160 and 57, 199 share everything except the top of the range: both weigh 210 lb (95 kg) in the 19 x 21 x 43½ in (480 x 530 x 1105 mm) cabinet, both hold 3.85 USG of boiler water, both fire from 32 MBH natural gas (60 MBH propane) and both print 95.0% AFUE with a 60 psig rating.
Maximum input separates them: 160 MBH on the 45, 160 against 199 MBH on the 57, 199, with output of 30-149 and 30-185 MBH and Net AHRI ratings of 127 and 160 MBH. Because minimum fire is identical, the 57, 199's extra ceiling is pure headroom at the top end.
Both models can be common-vented with other Vitodens 200-W boilers of the same size and series, and both share the 21% high-altitude derate at 10,000 ft. A load that never approaches 160 MBH keeps identical low-fire behaviour on the smaller model.
The Vitodens 200-W B2HB 45, 160 opens the B2HB large chassis: 32 to 160 MBH natural gas input (60 to 160 MBH propane) at 95.0% AFUE in a 210 lb (95 kg) wall-hung boiler with a 60 psig rating.
The Vitodens 200-W B2HB 57, 199 is the top of the previous-generation B2HB line: 32 to 199 MBH natural gas input (60 to 199 MBH propane) at 95.0% AFUE in the 210 lb (95 kg) large chassis.
No. Both weigh 210 lb (95 kg) and share the same cabinet, water content and 60 psig rating; only the firing range differs.
Yes — 32 MBH natural gas and 60 MBH propane on both, so the 57, 199's wider range is headroom at the top only.
When the design load approaches 199 MBH. Below about 160 MBH the 45, 160 delivers identical low-fire behaviour and a lower maximum input.
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.