Viessmann 7722773 Vitodens 100‑W B1HE‑120 | 120,000 BTU High‑Efficiency Wall‑Hung Condensing Hydronic Boiler
Looking for reliable heat without taking up floor space? The Vitodens 100‑W B1HE‑120 is a heating‑only, wall‑hung gas condensing boiler that’s efficient, quiet, and easy to live with. It runs at 95% AFUE, modulates with a wide 10:1 turndown ratio, and uses an Inox‑Radial stainless steel heat exchanger to help keep performance high season after season. Built‑in WiFi works with ViCare for simple control from your phone.
- Brand: Viessmann
- MPN: 7722773 (Vitodens 100‑W B1HE‑120, Heating‑Only)
- Type: Wall‑Mounted, Gas‑Fired Condensing Hydronic Boiler (Heating‑Only)
- Fuel: Natural Gas or LP (software conversion)
- Input Range: 12–120 MBH
- DOE Heating Capacity: 113 MBH
- Net AHRI (Water): 98 MBH
- AFUE: 95%
- Turndown Ratio: 10:1
- Max Operating Pressure: 60 psig
- Venting (Coaxial): 80/125 mm concentric (5"×3")
- Venting (Two‑Pipe): 3" or 4" polypropylene/CPVC (equivalent lengths commonly up to ~98 ft for 3" and ~148 ft for 4")
- Heating Connections: 3/4" NPT (supply/return)
- Gas Connection: 3/4" NPT
- Electrical: 120V, 60 Hz
- Dimensions (W × D × H): ~17.7" × 19.7" × 33.8"
- Included: 30 psi pressure relief valve, installation fittings, outdoor temperature sensor
- Warranty: Limited lifetime heat exchanger (residential; see terms)
High Efficiency, Lower Fuel Bills
At 95% AFUE with a 10:1 turndown ratio, the B1HE‑120 matches output to demand to reduce cycling and help cut gas costs.
Heating‑Only, Ideal For Indirect Hot Water
Keep space heating and domestic hot water separate. Pair the B1HE‑120 with an indirect tank for abundant hot water and simple controls.
Stainless Steel Heat Exchanger
The Inox‑Radial stainless‑steel heat exchanger is purpose‑built for condensing operation—resisting corrosion and supporting long service life.
Compact, Quiet, Easy To Service
A slim, 17.7"‑wide cabinet and front‑access components make tight installs and annual service straightforward.
Flexible Fuel & Venting Options
Convert between natural gas and LP in software. Choose 80/125 mm concentric or 3"/4" two‑pipe venting to handle longer runs and tricky layouts.
Smartphone Control With ViCare
Built‑in WiFi connects to the ViCare app so you can view temperatures, set schedules, and receive alerts right from your phone.
Technical Data Manual
Installation and Service Manual
Product Flyer
Application Guide
