Viessmann · Vitodens 100-W (legacy B1HA / B1KA and earlier)
Viessmann Vitodens 100-W B1HA 26, 94
The Vitodens 100-W B1HA 26, 94 is the smaller heating-only model of the B1HA/B1KA generation: 21 to 94 MBH natural gas input at 95.0% AFUE in a 79.4 lb (36 kg) wall-hung boiler.
Key figures
- Max input
- 94 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 21 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Viessmann Vitodens 100-W B1HA 26, 94 in practice
The B1HA 26, 94 is a wall-mounted gas-fired condensing boiler with a modulating MatriX cylinder burner and Inox-Radial stainless steel heat exchanger. Its printed CSA input range is 21-94 MBH (6.2-27.5 kW) on natural gas and 31-94 MBH (9.1-27.5 kW) on liquid propane, with 20-87 MBH (5.7-25.6 kW) output and a 76 MBH Net AHRI rating at 95.0% AFUE.
At 79.4 lb (36 kg) with a 88.2 lb (40 kg) shipping weight, it measures 400 x 400 x 768 mm (15¾ x 15¾ x 30¼ in) with 1.02 USG of boiler water and a 45 psig maximum operating pressure. The boiler is suitable for high-altitude operation to 10,000 ft with electronic adjustment and is documented in Viessmann Canada's B1HA/B1KA technical data manual (doc 5784 566 - 12).
Best suited to
- Owners of existing B1HA 26/94 units looking up printed ratings and manuals
- Small homes whose heat-loss calculation fits within 94 MBH of input
- Documentation for the smaller heating-only B1HA size
Applicability and support
- Model number
- B1HA 26, 94
- 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 (natural gas) | 21 MBH | 6.2 kW, per the technical data manual |
| CSA input, maximum (natural gas) | 94 MBH | 27.5 kW, per the technical data manual |
| CSA input (liquid propane) | 31-94 MBH | Printed LPG range from the same table. |
| Output | ||
| CSA output / DOE heating capacity (natural gas) | 20-87 MBH | 5.7-25.6 kW, based on 140°F / 120°F supply/return |
| Net AHRI rating | 76 MBH | Based on piping and pick-up allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE on all B1HA/B1KA models per the technical data manual. |
| Physical and connections | ||
| Weight | 79.4 lb | 36 kg |
| Shipping weight | 88.2 lb | 40 kg |
| Overall width | 400 mm | 15¾ in |
| Overall depth | 400 mm | 15¾ in |
| Overall height | 768 mm | 30¼ in |
| Operating limits and other | ||
| Fuel | Natural gas or liquid propane | NG minimum supply pressure 4 in. w.c.; LPG 10 in. w.c. |
| Boiler water content | 1.02 USG | 3.88 L. |
| Maximum operating pressure | 45 psig | 3 bar at 210°F (99°C). |
| Boiler heating supply / return | ¾ in. NPTM | Pressure relief valve ¾ in. NPTF; flue gas connection 2⅜ in (60 mm). |
Manuals
- Technical Data Manual — Vitodens 100-W B1HA Series and B1KA Combi Boiler, doc 5784 566 - 125784 566 - 12 · 2025-04
- Installation and Service Instructions — Vitodens 100-W B1HA/B1KA, rev 2222 · 2025-08
- Technical Data Manual — Vitodens 100-W WB1A Series, doc 5347 963 v1.15347 963 v1.1 · 2007-10
- Technical Data Manual — Vitodens 100-W WB1B Series, doc 5369 277 v1.55369 277 v1.5 · 2010-01
Alerts documented for this model
None documented yet.
Frequently asked questions
What is the B1HA 26, 94 rated at?
21-94 MBH (6.2-27.5 kW) natural gas input, 31-94 MBH on propane, 20-87 MBH output, a 76 MBH Net AHRI rating and 95.0% AFUE.
Is the B1HA 26, 94 a combi boiler?
No. It is a heating-only boiler; domestic hot water is handled with an indirect tank. The B1KA 35, 125 is the combi model of the same generation.
What manual covers the B1HA 26, 94?
The Vitodens 100-W B1HA Series and B1KA Combi technical data manual (doc 5784 566 - 12, 04/2025), plus the B1HA/B1KA installation and service instructions (rev 22, 08/2025), both linked on this record.
Questions about the Viessmann Vitodens 100-W B1HA 26, 94?
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 100-W B1HA 26, 94 vs B1HA 35, 125Comparison
- Viessmann Vitodens 100-W B1HA 35, 125Same series
- Viessmann Vitodens 100-W B1KA 35, 125Same series
- Viessmann Vitodens 100-W WB1A 8-24Same series
- Viessmann Vitodens 100-W WB1A 8-30Same series
- Viessmann Vitodens 100-W WB1B 26Same series
- Viessmann Vitodens 100-W WB1B 35Same series
- Vitodens 100-W (legacy B1HA / B1KA and earlier) series hub
- Buying guide
Sources and verification
- Technical Data Manual — Vitodens 100-W B1HA Series and B1KA Combi Boiler, doc 5784 566 - 12 · 5784 566 - 12 · 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.