Viessmann · Vitodens 200-W (legacy B2HA / B2HB)
Viessmann Vitodens 200-W WB2B-105
The Vitodens 200-W WB2B-105 is the largest WB2B boiler: 104 to 370 MBH NG/LPG input at 96.1% AFUE with a printed 94.5% thermal efficiency (ANSI Z21.13/CSA 4.9).
Key figures
- Max input
- 370 MBH
- Max CSA output
- —
- AFUE
- 96.1 %
- Min input
- 104 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Viessmann Vitodens 200-W WB2B-105 in practice
The WB2B-105 tops the WB2B range at 104-370 MBH (30-108 kW) input and 98-350 MBH (29-103 kW) output with a 304 MBH Net I=B=R rating at 96.1% AFUE. It is the only WB2B size with a printed CSA thermal efficiency row: 94.5% per ANSI Z21.13/CSA 4.9.
It shares the 225 lb (102 kg), 3.4 USG, 60 psig large chassis with the WB2B-80, and the technical data manual notes a high-altitude derate for this model — 14% at 5,000 ft and 28% at 10,000 ft, averaging 2.8% per 1,000 ft. Multi-boiler installations with the Vitocontrol-S control are documented for the 80 and 105 models.
Best suited to
- Owners of existing WB2B-105 units looking up printed ratings
- The largest WB2B loads at up to 370 MBH input
- Documentation for the top WB2B size and its altitude derate
Applicability and support
- Model number
- WB2B-105
- 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) | 104 MBH | 30 kW, per the technical data manual |
| CSA input, maximum (NG/LPG) | 370 MBH | 108 kW, per the technical data manual |
| Output | ||
| CSA output / DOE heating capacity | 98-350 MBH | 29-103 kW, based on 140°F / 120°F supply/return |
| Net I=B=R rating | 304 MBH | Based on piping and pick-up allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 96.1 % | 96.1% AFUE per the technical data manual. |
| CSA thermal efficiency (ANSI Z21.13/CSA 4.9) | 94.5 % | Printed only for the WB2B-105. |
| Physical and connections | ||
| Weight | 225 lb | 102 kg |
| Width | 19 in | 480 mm |
| Depth | 21 in | 530 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 | 3.4 USG | |
| Maximum operating pressure | 60 psig | At 210°F (99°C). |
| Boiler heating supply / return | 1¼ in. NPTM | Gas valve connection 1 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-105 rated at?
104-370 MBH (30-108 kW) NG/LPG input, 98-350 MBH (29-103 kW) output, a 304 MBH Net I=B=R rating and 96.1% AFUE, with a printed 94.5% CSA thermal efficiency (ANSI Z21.13/CSA 4.9).
Does the WB2B-105 derate at altitude?
Yes — the technical data manual prints an altitude derate for the WB2B-105 of 14% at 5,000 ft and 28% at 10,000 ft (average 2.8% per 1,000 ft).
What replaced the WB2B generation?
The later B2HB generation and then the current B2HE series. The WB2B documentation remains in Viessmann Canada's historic manuals for existing installations.
Questions about the Viessmann Vitodens 200-W WB2B-105?
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-80 vs WB2B-105Comparison
- Viessmann Vitodens 200-W WB2B-19Same series
- Viessmann Vitodens 200-W WB2B-26Same 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
- 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.