Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the Viessmann Vitodens 200-W WB2B-26 and the Viessmann Vitodens 200-W WB2B-35 belong to the Viessmann Vitodens 200-W (legacy B2HA / B2HB) line of condensing boilers. Published ratings: Viessmann Vitodens 200-W WB2B-26 at 31–93 MBH input, 28-85 MBH csa output / DOE heating capacity and 96.1% AFUE; Viessmann Vitodens 200-W WB2B-35 at 31–125 MBH input, 28-114 MBH csa output / DOE heating capacity and 96.1% AFUE. Viessmann Vitodens 200-W WB2B-35 lists 32 MBH more input than Viessmann Vitodens 200-W WB2B-26 (125 MBH against 93 MBH). Both list the same published AFUE of 96.1%. Both list the same published shipping weight of 102 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 200-W WB2B-26 | Viessmann Vitodens 200-W WB2B-35 |
|---|---|---|
| CSA input, minimum (NG/LPG) | 31 MBH | 31 MBH |
| CSA input, maximum (NG/LPG) | 93 MBH | 125 MBH |
| Efficiency (AFUE) | 96.1 % | 96.1 % |
| Boiler water content | 0.87 USG | 0.87 USG |
| Weight | 102 lb | 102 lb |
| Height | 33.5 in | 33.5 in |
| Width | 17.75 in | 17.75 in |
| Depth | 14 in | 14 in |
| Maximum operating pressure | 45 psig | 45 psig |
| Fuel | Natural gas or liquid propane gas | Natural gas or liquid propane gas |
| CSA output / DOE heating capacity | 28-85 MBH | 28-114 MBH |
| Net I=B=R rating | 74 MBH | 99 MBH |
| Boiler heating supply / return | ¾ in. NPTM | ¾ in. NPTM |
Published ratings: the Viessmann Vitodens 200-W WB2B-26 is rated 31–93 MBH input, 28-85 MBH csa output / DOE heating capacity and 96.1% AFUE; the Viessmann Vitodens 200-W WB2B-35 is rated 31–125 MBH input, 28-114 MBH csa output / DOE heating capacity and 96.1% AFUE. Viessmann Vitodens 200-W WB2B-35 lists 32 MBH more input than Viessmann Vitodens 200-W WB2B-26 (125 MBH against 93 MBH). Both list the same published AFUE of 96.1%.
Both records print the same input (31 MBH), AFUE (96.1%), boiler water content (0.87 USG) and shipping weight (102 lb), per the cited sources.
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.
Viessmann
The Vitodens 200-W WB2B-35 is the largest WB2B model on the compact chassis: 31 to 125 MBH NG/LPG input at 96.1% AFUE in a 102 lb (46 kg) cabinet.
The Viessmann Vitodens 200-W WB2B-35 lists 125 MBH, against 93 MBH on the Viessmann Vitodens 200-W WB2B-26, per the cited documentation.
Both list the same AFUE of 96.1%.
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.