Viessmann Vitodens 100-W B1KE-120 Combi Boiler, 120,000 BTU

A wall-mounted gas condensing combination boiler that handles both home heating and on-demand domestic hot water, so no separate storage tank is needed. The B1KE-120 fires from 12 to 120 MBH at 95% AFUE and supplies up to 3.3 GPM of hot water at a 77°F rise.

A stainless steel Inox-Radial heat exchanger, a MatriX-Plus burner that modulates its flame, and Lambda Pro Plus combustion management work together, and the 10:1 turndown lets the boiler throttle down in mild weather instead of cycling on and off. Domestic water is heated through an integrated plate heat exchanger up to 140°F.

It runs on natural gas or liquid propane. Built-in WiFi pairs with the ViCare app for remote monitoring, and a 3.5-inch color touchscreen handles settings at the unit. The cabinet measures 17-3/4 in. W x 19-3/4 in. D x 33-3/4 in. H, with 3/4 in. NPT heating and gas connections and a 45 psi maximum operating pressure. Homes running several high-flow fixtures at once may need a larger model.

Highlights

• Heats the home and supplies on-demand hot water from one wall-hung unit

• 12-120 MBH input range with 10:1 turndown and 95% AFUE

• Supplies up to 3.3 GPM of domestic hot water continuously at a 77°F rise

• Stainless Inox-Radial heat exchanger and MatriX-Plus modulating burner

• Built-in WiFi for the ViCare app plus a 3.5-inch color touchscreen

• 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.