Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The WB2B-45 and WB2B-60 are the two mid-chassis WB2B boilers and are physically identical: 155 lb (70 kg), 1.9 USG of water, 60 psig and the same 19 x 15 x 33½ in cabinet at 96.1% AFUE, both firing from 60 MBH NG/LPG. The WB2B-60 simply fires higher — 212 against 160 MBH — for a 169 MBH Net I=B=R 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 WB2B-45 | Viessmann Vitodens 200-W WB2B-60 |
|---|---|---|
| CSA input, minimum (NG/LPG) | 60 MBH | 60 MBH |
| CSA input, maximum (NG/LPG) | 160 MBH | 212 MBH |
| CSA output / DOE heating capacity | 55-146 MBH | 55-194 MBH |
| Net I=B=R rating | 127 MBH | 169 MBH |
| Efficiency (AFUE) | 96.1 % | 96.1 % |
| Weight | 155 lb | 155 lb |
| Boiler water content | 1.9 USG | 1.9 USG |
| Maximum operating pressure | 60 psig | 60 psig |
Both boilers share the WB2B mid chassis: a 60 MBH (17 kW) minimum input, 55 MBH output floor, 96.1% AFUE, 155 lb (70 kg) weight, 1.9 USG water content, 60 psig maximum operating pressure and 19 x 15 x 33½ in (480 x 380 x 850 mm) dimensions.
Maximum input separates them: 160 MBH (47 kW) on the WB2B-45 against 212 MBH (62 kW) on the WB2B-60, with outputs of 55-146 and 55-194 MBH and Net I=B=R ratings of 127 and 169 MBH.
Both support single-boiler installation and multi-boiler installations with the Vitocontrol-S, WB2B cascade control, and both use 1¼ in. supply and return connections with a 1 in. gas valve connection.
Viessmann
The Vitodens 200-W WB2B-45 opens the WB2B mid chassis: 60 to 160 MBH NG/LPG input at 96.1% AFUE in a 155 lb (70 kg) wall-hung boiler.
Viessmann
The Vitodens 200-W WB2B-60 is the larger mid-chassis WB2B: 60 to 212 MBH NG/LPG input at 96.1% AFUE in a 155 lb (70 kg) cabinet.
Yes. Both weigh 155 lb (70 kg) and share the 19 x 15 x 33½ in (480 x 380 x 850 mm) cabinet with 1.9 USG of boiler water.
60-160 MBH (17-47 kW) on the WB2B-45 and 60-212 MBH (17-62 kW) on the WB2B-60, on natural gas or liquid propane.
Yes — the Vitocontrol-S, WB2B cascade control is documented for multiple-boiler installations of the 45 and 60 models.
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.