Viessmann Vitodens 100-W B1HE-85 Gas Condensing Boiler, 85 MBH - 7722772

The Viessmann Vitodens 100-W B1HE-85 (7722772) is a wall-mounted gas condensing boiler for space heating only, sized for small to mid-size homes. It reaches 95% AFUE, modulates down to 8.5 MBH on natural gas and frees up floor space in the mechanical room.

Input runs 8.5-85 MBH on natural gas and 14-85 MBH on LP, with a DOE heating capacity of 80 MBH and a Net AHRI water rating of 70 MBH. An Inox-Radial stainless steel heat exchanger is designed for condensing service, NOx emissions stay below 20 ppm, and a software setting allows operation up to 10,000 ft. Integrated Wi-Fi links to the ViCare app for schedules and alerts.

Venting can be coaxial 80/125 mm or 100/150 mm, or two-pipe 2 in., 3 in. or 4 in. with equivalent lengths up to 98, 164 and 198 ft respectively; the 2 in. option reduces input by 2%. Heating and gas connections are both 3/4 in. NPT, and maximum operating pressure is 45 psig.

Highlights

• 95% AFUE with a 10:1 turndown ratio

• Input 8.5-85 MBH on natural gas, 14-85 MBH on LP

• Inox-Radial stainless steel heat exchanger; NOx under 20 ppm

• Integrated Wi-Fi for ViCare app control

• Coaxial or 2/3/4 in. two-pipe venting for retrofit flexibility

Specifications

In the box

• 30 psi pressure relief valve

• Installation fittings

• Outdoor temperature sensor

Good to know

• Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.