Viessmann Vitodens 200-W B2HE-120 Gas Condensing Boiler, 120 MBH

The Viessmann Vitodens 200-W B2HE-120 (7722779) is a wall-mounted, heat-only gas condensing boiler for homes and light commercial spaces. It modulates from 8.5 to 120 MBH on natural gas, reaches 95% AFUE and comes with an onboard 7 in. color touchscreen control.

Pairing a MatriX-Plus modulating cylinder burner with an Inox-Radial stainless heat exchanger, it delivers a Net AHRI rating of 98 MBH. Sound ranges from 34 dB at minimum to 59 dB at maximum fire, maximum condensate is 1.2 USG/h, and operation is possible up to 10,000 ft. NOx is below 20 ppm, meeting SCAQMD 1146.2, BAAQMD Reg. 9-6 and SJVAPCD 4308.

The direct-vent boiler uses a 3 in. (80 mm) flue with 5 in. (125 mm) coaxial air or 3 in. single pipe, with vent runs up to 180 ft. Heating supply/return is 3/4 in. NPTM, the DHW tank loop is 3/4 in. NPT and gas is 3/4 in. NPTF. An integral variable-speed boiler pump, DHW sensor and outdoor sensor simplify commissioning, and the touchscreen adds Wi-Fi and outdoor reset.

Highlights

• 8.5-120 MBH input on natural gas; Net AHRI 98 MBH

• 95% AFUE with Inox-Radial stainless-steel heat exchanger

• Integral variable-speed boiler pump and 7 in. touchscreen control

• Direct venting with runs up to 180 ft

• Low-NOx under 20 ppm; built to CSA B51 and ASME Section IV

Specifications

In the box

• Pressure gauge

• Installation fittings with 30 psig PRV

• DHW sensor

• 7 in. touchscreen control with outdoor sensor

• Wall-mount bracket and hardware

• Integral variable-speed boiler pump

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.