Viessmann · Vitodens 200-W (legacy B2HA / B2HB)
Viessmann Vitodens 200-W WB2B-45
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.
Key figures
- Max input
- 160 MBH
- Max CSA output
- —
- AFUE
- 96.1 %
- Min input
- 60 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Viessmann Vitodens 200-W WB2B-45 in practice
The WB2B-45 is the first WB2B model on the larger chassis: 60-160 MBH (17-47 kW) input, 55-146 MBH (16-43 kW) output and a 127 MBH Net I=B=R rating at 96.1% AFUE. It weighs 155 lb (70 kg) with 1.9 USG of boiler water and a 60 psig maximum operating pressure.
Dimensions are 19 x 15 x 33½ in (480 x 380 x 850 mm), with 1¼ in. supply and return connections and a 1 in. gas valve connection. The 45 and 60 models share installation and service instructions and support single- or multi-boiler installation with the Vitocontrol-S cascade control.
Best suited to
- Owners of existing WB2B-45 units looking up printed ratings
- Larger homes whose load calculation exceeds the compact WB2B chassis
- Documentation for the first mid-chassis WB2B size
Applicability and support
- Model number
- WB2B-45
- 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) | 60 MBH | 17 kW, per the technical data manual |
| CSA input, maximum (NG/LPG) | 160 MBH | 47 kW, per the technical data manual |
| Output | ||
| CSA output / DOE heating capacity | 55-146 MBH | 16-43 kW, based on 140°F / 120°F supply/return |
| Net I=B=R rating | 127 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 | 155 lb | 70 kg |
| Width | 19 in | 480 mm |
| Depth | 15 in | 380 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 | 1.9 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-45 rated at?
60-160 MBH (17-47 kW) NG/LPG input, 55-146 MBH (16-43 kW) output, a 127 MBH Net I=B=R rating and 96.1% AFUE.
How does the WB2B-45 differ from the WB2B-35?
It moves to the 155 lb mid chassis with 1.9 USG water, a 60 psig rating and 1¼ in. connections, and its firing range starts at 60 MBH instead of 31 MBH.
Can the WB2B-45 be cascaded?
Yes — the technical data manual documents multi-boiler installations of the WB2B 45 and 60 models with the Vitocontrol-S, WB2B cascade control, in addition to single-boiler installation.
Questions about the Viessmann Vitodens 200-W WB2B-45?
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-45 vs WB2B-60Comparison
- 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-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.