Viessmann 7722772 Vitodens 100-W B1HE-85 85,000 BTU High Efficiency Hyrdronic Boiler

Viessmann 7722772 Vitodens 100‑W B1HE‑85 | 85,000 BTU High‑Efficiency Wall‑Hung Condensing Hydronic Boiler

Looking for reliable heat without taking up floor space? The Vitodens 100‑W B1HE‑85 is a heating‑only, wall‑hung gas condensing boiler that’s efficient, quiet, and easy to live with. It runs at 95% AFUE, modulates from 8.5–85 MBH to match demand, 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: 7722772 (Vitodens 100‑W B1HE‑85, Heating‑Only)
• Type: Wall‑Mounted, Gas‑Fired Condensing Hydronic Boiler (Heating‑Only)
• Fuel: Natural Gas or LP
• Input Range: 8.5–85 MBH (NG); 14–85 MBH (LP)
• DOE Heating Capacity: 80 MBH
• Net AHRI (Water): 70 MBH
• AFUE: 95%
• Turndown Ratio: 10:1
• Max Operating Pressure: 45 psig
• Venting (Coaxial): 80/125 mm or 100/150 mm concentric (typical)
• Venting (Two‑Pipe): 2" up to 98 ft*, 3" up to 164 ft, 4" up to 198 ft equivalent length (*automatic 2% input reduction)
• Altitude: Up to 10,000 ft (software setting)
• NOx Emissions: < 20 ppm
• Heating Connections: 3/4" NPT (supply/return)
• Gas Connection: 3/4" NPT
• Electrical: 120V, 60 Hz; outdoor temperature sensor included
• Dimensions (W × D × H): ~17‑3/4" × 19‑3/4" × 33‑3/4"
• Weight: 108 lb
• 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‑85 matches output to demand to reduce cycling and help cut gas costs.

Right‑Sized For Small To Mid‑Size Homes

The 8.5–85 MBH input range is a great fit for many baseboard and radiant systems. It runs gently on mild days and ramps up when winter really hits—keeping rooms comfortable without oversizing.

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. Sound levels are designed to be pleasantly quiet in typical mechanical spaces.

Flexible Venting For Retrofits

Choose concentric 80/125 mm (or 100/150 mm) or 2"/3"/4" two‑pipe venting to handle longer runs and tricky layouts—ideal for replacements where routing is limited.

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.