Viessmann · Vitodens 200-W (legacy B2HA / B2HB)
Viessmann Vitodens 200-W WB2B-26
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.
Key figures
- Max input
- 93 MBH
- Max CSA output
- —
- AFUE
- 96.1 %
- Min input
- 31 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Viessmann Vitodens 200-W WB2B-26 in practice
The WB2B-26 is rated 31-93 MBH (9-27 kW) input, 28-85 MBH (8-25 kW) output and a 74 MBH Net I=B=R rating at 96.1% AFUE. It shares the 102 lb (46 kg), 0.87 USG, 45 psig compact chassis with the WB2B-19 and WB2B-35.
The WB2B generation runs on natural gas or liquid propane with a 4 in. w.c. minimum NG supply pressure and 10 in. w.c. for LPG. Its technical data manual documents side-wall and vertical venting options; the 19, 26 and 35 models share their installation and service instructions.
Best suited to
- Owners of existing WB2B-26 units looking up printed ratings
- Residential loads between the WB2B-19 and WB2B-35
- Documentation for the compact WB2B chassis
Applicability and support
- Model number
- WB2B-26
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Viessmann. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| CSA input, minimum (NG/LPG) | 31 MBH | 9 kW, per the technical data manual |
| CSA input, maximum (NG/LPG) | 93 MBH | 27 kW, per the technical data manual |
| Output | ||
| CSA output / DOE heating capacity | 28-85 MBH | 8-25 kW, based on 140°F / 120°F supply/return |
| Net I=B=R rating | 74 MBH | Based on piping and pick-up allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 96.1 % | 96.1% AFUE per the technical data manual. |
| Physical and connections | ||
| Weight | 102 lb | 46 kg |
| Width | 17.75 in | 450 mm |
| Depth | 14 in | 360 mm |
| Height | 33.5 in | 850 mm |
| Operating limits and other | ||
| Fuel | Natural gas or liquid propane gas | NG minimum supply pressure 4 in. w.c.; LPG 10 in. w.c. |
| Boiler water content | 0.87 USG | |
| Maximum operating pressure | 45 psig | At 210°F (99°C). |
| Boiler heating supply / return | ¾ in. NPTM | Gas valve connection ¾ in. NPTF; pressure relief and drain valves ¾ in. |
Manuals
- Technical Data Manual — Vitodens 200-W WB2B Series, doc 5369 295 v1.55369 295 v1.5 · 2012-09
- Installation Instructions — Vitodens 200-W WB2B 19, 26, 35, rev 1.61.6 · 2011-12
- Technical Data Manual — Vitodens 200-W WB2 Series, rev 3.43.4 · 2008-01
Alerts documented for this model
None documented yet.
Frequently asked questions
What is the WB2B-26 rated at?
31-93 MBH (9-27 kW) NG/LPG input, 28-85 MBH (8-25 kW) output, a 74 MBH Net I=B=R rating and 96.1% AFUE.
How does the WB2B-26 differ from the WB2B-19?
Only the firing range: 31-93 vs 31-67 MBH input and 28-85 vs 28-61 MBH output, in the same chassis and weight.
What venting options does the WB2B-26 support?
The technical data manual documents horizontal or vertical sealed-combustion coaxial venting, double-pipe and single-wall options; per-configuration lengths are set out in the venting instructions.
Questions about the Viessmann Vitodens 200-W WB2B-26?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Compare and explore
- Viessmann Vitodens 200-W WB2B-19 vs WB2B-26Comparison
- Viessmann Vitodens 200-W WB2B-26 vs WB2B-35Comparison
- Viessmann Vitodens 200-W WB2B-19Same series
- Viessmann Vitodens 200-W WB2B-35Same series
- Viessmann Vitodens 200-W WB2B-45Same series
- Viessmann Vitodens 200-W WB2B-60Same series
- Viessmann Vitodens 200-W WB2B-80Same series
- Viessmann Vitodens 200-W WB2B-105Same series
- Vitodens 200-W (legacy B2HA / B2HB) series hub
- Buying guide
Sources and verification
- Technical Data Manual — Vitodens 200-W WB2B Series, doc 5369 295 v1.5 · 5369 295 v1.5 · accessed September 9, 2026
- Viessmann Canada — Historic manuals · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.