Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The WB2B-19 and WB2B-26 are the two smallest WB2B boilers and share the 102 lb (46 kg) cabinet, 0.87 USG water content, 45 psig rating, 96.1% AFUE and a 31 MBH NG/LPG minimum input. The WB2B-26 fires to 93 MBH against 67 MBH, with a 74 MBH Net I=B=R rating against 53.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 200-W WB2B-19 | Viessmann Vitodens 200-W WB2B-26 |
|---|---|---|
| CSA input, minimum (NG/LPG) | 31 MBH | 31 MBH |
| CSA input, maximum (NG/LPG) | 67 MBH | 93 MBH |
| CSA output / DOE heating capacity | 28-61 MBH | 28-85 MBH |
| Net I=B=R rating | 53 MBH | 74 MBH |
| Efficiency (AFUE) | 96.1 % | 96.1 % |
| Weight | 102 lb | 102 lb |
| Boiler water content | 0.87 USG | 0.87 USG |
| Maximum operating pressure | 45 psig | 45 psig |
Both boilers are wall-hung condensing models on the WB2B compact chassis: 31 MBH (9 kW) minimum input, 28 MBH output floor, 96.1% AFUE, 102 lb (46 kg) weight, 0.87 USG water content, 45 psig maximum operating pressure and 17¾ x 14 x 33½ in (450 x 360 x 850 mm) dimensions.
Maximum input separates them: 67 MBH (20 kW) on the WB2B-19 against 93 MBH (27 kW) on the WB2B-26, with outputs of 28-61 and 28-85 MBH and Net I=B=R ratings of 53 and 74 MBH.
Both share the 19, 26 and 35 installation and service instructions and run on natural gas or propane. The technical data manual's multi-boiler documentation covers the larger 45, 60, 80 and 105 models.
Viessmann
The Vitodens 200-W WB2B-19 is the smallest WB2B wall-hung condensing boiler: 31 to 67 MBH NG/LPG input at 96.1% AFUE in a 102 lb (46 kg) cabinet.
Viessmann
The Vitodens 200-W WB2B-26 is the mid-size model of the WB2B compact chassis: 31 to 93 MBH NG/LPG input at 96.1% AFUE in the 102 lb (46 kg) cabinet.
Yes. Both weigh 102 lb (46 kg) and measure 17¾ x 14 x 33½ in (450 x 360 x 850 mm) with 0.87 USG of boiler water.
31-67 MBH (9-20 kW) on the WB2B-19 and 31-93 MBH (9-27 kW) on the WB2B-26, on natural gas or liquid propane.
The WB2B technical data manual's multi-boiler documentation covers the 45, 60, 80 and 105 models; the 19, 26 and 35 share single-boiler installation and service instructions.
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.