Viessmann Vitodens 100-W

product description

Viessmann Vitodens 100-W Wall-Mounted Condensing Gas Boiler

The Vitodens 100-W gas-fired wall-mount condensing boiler is designed to provide reliable, high-efficiency heating for homes of all sizes while remaining affordable and easy to install. The latest generation of this popular boiler offers improved versatility, advanced controls, and excellent performance, making it suitable for a wide range of residential heating applications.

A new optional CombiPLUS Kit allows the Vitodens 100-W to deliver on-demand domestic hot water (DHW), combining efficient space heating with continuous hot water supply. This feature enhances convenience while maintaining the compact wall-mounted design.

At the core of the system is the Viessmann-manufactured Inox-Radial heat exchanger, constructed from SA240 316Ti stainless steel and built to CSA B51 and ASME Section IV standards. This high-quality heat exchanger provides excellent durability, corrosion resistance, and long-lasting performance.

The boiler also features the Viessmann MatriX stainless steel cylinder burner, designed for low-emission combustion and optimized performance with either natural gas or propane. Each burner is factory calibrated to ensure reliable and efficient operation.

The integrated on-board boiler control system is designed to interface with most external control systems and now includes integrated 0-10V and OpenTherm® communication capability. An outdoor temperature sensor is included as standard, enabling weather-responsive control for improved energy efficiency and comfort.

The Vitodens 100-W offers greater venting flexibility, supporting vent lengths of up to 200 feet with multiple venting options. These include horizontal or vertical sealed combustion coaxial venting (factory supplied), horizontal, vertical, or hybrid double-pipe venting (field supplied), and single-wall venting options. The boiler can also operate at altitudes up to 10,000 feet (3,000 m), making it suitable for a wide range of installation environments.

Installation and servicing are simplified with all pipe connections located at the bottom and serviceable components accessible from the front of the unit. The boiler operates extremely quietly—quieter than most refrigerators—and features a compact, lightweight design with zero clearance to combustibles, allowing flexible placement in tight spaces.

For added protection, the system includes built-in automatic frost protection, which helps prevent freezing during extended shutdown periods.

In residential applications, the Vitodens 100-W is backed by a limited lifetime warranty, providing long-term peace of mind.

Model Specifications

The Vitodens 100-W is available in two models:

WB1B 26

• Rated Input: 37–91 MBH (8.5–23.4 kW)
• AFUE Efficiency: 94%
• Altitude Range: 0–10,000 ft (0–3,048 m)
• Dimensions: 28.5 in (H) × 15.75 in (W) × 14.125 in (D)
• Weight: 78 lbs (34.1 kg)

WB1B 35

• Rated Input: 37–118 MBH (8.5–29.3 kW)
• AFUE Efficiency: 94%
• Altitude Range: 0–10,000 ft (0–3,048 m)
• Dimensions: 28.5 in (H) × 15.75 in (W) × 14.125 in (D)
• Weight: 78 lbs (34.1 kg)

CombiPLUS Kit for On-Demand Domestic Hot Water

The optional CombiPLUS Kit can be paired with both WB1B 26 and WB1B 35 models to provide on-demand hot water.

• DHW Supply Temperature: 140°F (60°C)
• Continuous Draw Rate:
• 156 USG/h (589 L/h) for WB1B 26
• 216 USG/h (800 L/h) for WB1B 35

CombiPLUS Dimensions

• Depth: 9.8 in (250 mm)
• Width: 17 in (432 mm)
• Height: 8.7 in (223 mm)
• Weight: 25 lbs (11 kg)

The minimum to maximum installation distance between the boiler and CombiPLUS Kit is 11.5 to 36 inches (292–915 mm).

With its high efficiency, compact design, advanced controls, and durable stainless steel construction, the Vitodens 100-W offers an excellent solution for efficient home heating and optional domestic hot water production.