Viessmann Vitodens 200-W B2HA-399 Condensing Boiler, 399,000 BTU

A step up in capacity from the smaller B2HA models in the Vitodens 200-W range, this wall-mounted gas condensing boiler modulates from 113 to 399 MBH for large residential and light commercial heating. It carries a 93.9% thermal efficiency rating and a 323 MBH net AHRI rating.

Its stainless Inox-Radial heat exchanger works with a modulating MatriX cylinder burner, while Lambda Pro combustion management compensates for shifts in gas quality. The Vitotronic 200 control provides outdoor reset and diagnostics, and as many as eight B2HA boilers can run as a cascade. Paired with a compatible indirect tank, it can also handle domestic hot water.

Compared with smaller siblings it steps up to 2 in. male NPT heating connections and an 80 psi maximum operating pressure. The gas connection is 1 in. female NPT, power is 120V, 60 Hz, and the unit runs on natural gas or liquid propane. The cabinet is 23-1/2 in. W x 27 in. D x 44-1/2 in. H and weighs 298 lb.

Highlights

• 113-399 MBH input with a 323 MBH net AHRI rating

• 93.9% thermal efficiency under ANSI Z21.13/CSA 4.9 conditions

• 2 in. male NPT heating connections and 80 psi maximum operating pressure

• Vitotronic 200 control with outdoor reset; cascade up to eight boilers

• Direct venting, natural gas or liquid propane operation

Specifications

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.