Viessmann · Vitodens 200-W (B2HB)
Viessmann Vitodens 200-W B2HB 35, 125
The Vitodens 200-W B2HB 35, 125 is the largest model of the B2HB compact chassis: 19 to 125 MBH natural gas input (31 to 125 MBH propane) at 95.0% AFUE with a 102 MBH Net AHRI rating.
Key figures
- Max input
- 125 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 19 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Viessmann Vitodens 200-W B2HB 35, 125 in practice
The B2HB 35, 125 closes out the B2HB small chassis at 125 MBH: printed natural gas input 19-125 MBH (5.5-37 kW), propane 31-125 MBH (9-37 kW), output 18-117 MBH (5-34 kW) and a 102 MBH Net AHRI rating at 95.0% AFUE.
It keeps the 110 lb (50 kg), 1.02 USG and 45 psig figures of the 19, 68 and 26, 94, and like them it must not be common-vented with any other appliance. The B2HB 35 is also one of the three models covered by Viessmann Canada's heat-exchanger replacement safety notice for units built September 1, 2014 to April 25, 2017.
Best suited to
- Owners of existing B2HB 35/125 units verifying the safety notice
- Residential loads whose heat-loss calculation lands between 94 and 125 MBH
- Documentation reference for the last size in the B2HB compact chassis
Applicability and support
- Model number
- B2HB 35, 125
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
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 (natural gas) | 19 MBH | 5.5 kW, per the technical data manual |
| CSA input, maximum (natural gas) | 125 MBH | 37 kW, per the technical data manual |
| CSA input (liquid propane) | 31-125 MBH | Printed LPG range; minimums are higher than natural gas on the 26/94 and larger sizes. |
| Output | ||
| CSA output / DOE heating capacity (natural gas) | 18-117 MBH | 5-34 kW, based on 140°F / 120°F supply/return |
| Net AHRI rating | 102 MBH | Based on piping and pick-up allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE on all B2HB sizes per the technical data manual; up to 98% at full modulation. |
| Physical and connections | ||
| Weight | 110 lb | 50 kg |
| Width | 17.75 in | 450 mm |
| Depth | 15.7 in | 400 mm |
| Height | 41 in | 1040 mm |
| Operating limits and other | ||
| Fuel | Natural gas or liquid propane | As printed in the technical data manual's CSA input rows. |
| Boiler water content | 1.02 USG | |
| Maximum operating pressure | 45 psig | At 210°F (99°C). |
Manuals
- Technical Data Manual — Vitodens 200-W B2HB 19 to 57, 68 to 199, doc 5461 883 - 185461 883 - 18 · 2025-04
- Installation Instructions — Vitodens 200-W B2HB 19-35, rev 1616 · 2025-04
- Service Instructions — Vitodens 200-W B2HB 19-35, rev 2727 · 2025-04
- Installation Instructions — Vitodens 200-W B2HB 45-57, rev 1515 · 2025-04
- Service Instructions — Vitodens 200-W B2HB 45-57, rev 2121 · 2025-04
Alerts documented for this model
None documented yet.
Frequently asked questions
What is the firing range of the B2HB 35, 125?
19-125 MBH (5.5-37 kW) natural gas input and 31-125 MBH (9-37 kW) propane input, with 18-117 MBH output at 95.0% AFUE and a 102 MBH Net AHRI rating.
Is the B2HB 35 in the safety notice?
Yes — B2HB models 19, 26 and 35 manufactured between September 1, 2014 and April 25, 2017 are covered by Viessmann Canada's heat-exchanger replacement notice. Verify the serial number on the recall page.
What replaced the B2HB 35, 125?
The current Vitodens 200-W B2HE line; the B2HE-120 and B2HE-150 cover similar loads with the newer control platform. The B2HE models are not part of the B2HB safety notice.
Questions about the Viessmann Vitodens 200-W B2HB 35, 125?
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 B2HB 26, 94 vs B2HB 35, 125Comparison
- Viessmann Vitodens 200-W B2HB 35, 125 vs B2HB 45, 160Comparison
- Viessmann Vitodens 200-W B2HB 19, 68Same series
- Viessmann Vitodens 200-W B2HB 26, 94Same series
- Viessmann Vitodens 200-W B2HB 45, 160Same series
- Viessmann Vitodens 200-W B2HB 57, 199Same series
- Vitodens 200-W (B2HB) series hub
- Buying guide
Sources and verification
- Technical Data Manual — Vitodens 200-W B2HB 19 to 57, 68 to 199, doc 5461 883 - 18 · 5461 883 - 18 · accessed September 9, 2026
- Viessmann Canada — Current product manuals · accessed September 9, 2026
- Viessmann Canada — Safety Notice for Vitodens 200/222 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.