Viessmann Vitodens 100-W B1HE-150 Gas Condensing Boiler, 150 MBH - 7722774

The Viessmann Vitodens 100-W B1HE-150 (7722774) is a wall-mounted, heating-only gas condensing boiler for hydronic space heating. It reaches 95% AFUE, modulates over a 10:1 range and offers dedicated piping for an indirect water heater.

Input spans 15.5-150 MBH on natural gas and 14-150 MBH on LP, with 141 MBH DOE heating capacity and 123 MBH Net AHRI water rating. Both the MatriX-Plus burner and the Inox-Radial stainless heat exchanger are made for condensing duty, NOx stays under 20 ppm, and the unit runs up to 10,000 ft without input de-rate via a software setting. Fuel conversion is a software change with no mechanical adjustment.

Coaxial venting reaches 33 ft equivalent at 80/125 mm and 43 ft at 100/150 mm; two-pipe runs reach 98 ft in 3 in. and 148 ft in 4 in. Heating supply/return and indirect tank connections are 1 in. NPT, gas is 3/4 in. NPT male, and the boiler may sit tight against combustibles, which eases closet installs. Sound is about 51 dB at full fire.

Highlights

• Input 15.5-150 MBH (NG) or 14-150 MBH (LP), 10:1 turndown

• 95% AFUE; Net AHRI water rating 123 MBH

• 1 in. NPT connections for heating and an indirect DHW tank

• Two-pipe venting up to 148 ft equivalent in 4 in.

• Can be placed with zero distance to combustibles; front service access

• Integrated Wi-Fi with the ViCare app

Specifications

In the box

• 30 psi boiler pressure relief valve

• Installation fittings and hardware

• 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.