Benefits at a glance


    • Rated outputs: 13 kW, 16 kW, 19 kW, 26 kW and 35 kW
    • Exceeds SEDBUK minimum efficiency requirements
    • Compact dimensions to fit in standard kitchen cupboards
    • Standard efficiency up to 97% through stainless steel Inox-Radial heat exchanger
    • Weather compensation option
    • LPG conversion available
    • Large user display
    • Energy efficiency class: A
    • 5 year comprehensive warranty as standard
    • Viessmann Trained Installers can now offer their customers an extended warranty option up to 10 years



Compact enough to fit in a standard kitchen cupboard

Compact dimensions

With a depth of only 285 mm (340 mm on the 35 kW model) the compact Vitodens 100-W Open vent boiler is perfectly suited for integration into standard kitchen cupboards. It can also be used in a vast number of other applications where there is only limited space available.

Efficient, durable, quiet

The corrosion-resistant stainless steel Inox-Radial heat exchanger with unrivalled wall thickness, is extremely durable and achieves efficiency levels of up to 97%. The boiler's special design ensures the very low operating noise of 39 dB(A) maximum (26 kW), which is perfectly acceptable even in the kitchen.

Intelligent weather compensation

The Vitodens 100-W Open vent can even operate in weather compensated mode without incurring a costly heating system modification, all that is needed is a simple upgrade.
Weather compensation acts like an auto-pilot as it detects outside temperature changes and automatically adjusts the flow temperature of the boiler, achieving gas savings of up to 12% in the process.

Versatile system solutions

Whilst being specifically designed for open vent heating systems, the Vitodens 100-W Open vent is suitable for sealed systems using an additional expansion vessel safety valve.
The boiler also shares the various flue options available for the Combination and System models of the Vitodens 100-W gas condensing boiler range.



Product cross-section


7.9 to 35 kW
Standard seasonal efficiency [SEDBUK 2009/2012]
97 % (Hs) [gross cv] / 108 % (Hi) [net cv]
Natural Gas & LPG
Easy to use dials with a large LCD display
Heat Only boiler
with 5 outputs 13, 16, 19, 26 & 35 kW
Additional features
MatriX cylinder burner and Inox-Radial heat exchanger

ErP Label

Energy efficiency class
Application range
Detached and two-family houses, apartment buildings, new build and modernisation projects
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