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    Viessmann Vitodens 100-W Open Vent Boilers

    The Viessmann Vitodens 100-W Open Vent Boiler typically costs between £901.41 and £1,159.05 including VAT and excluding installation fees.

    Viessmann Vitodens 100-W Open Vent Boilers

    Class A rated for energy efficiency, the Viessmann Vitodens 100-W Open Vent is a wall-mounted condensing boiler that is both durable and quiet.

    It comes in five output sizes of 13kW, 16kW, 19kW, 26kW and 35kW to provide options for homes with low or high heating and hot water demands. The unit has compact dimensions which measure 600mm (H) x 375mm (W) x 285mm (D – 340mm on the 35kW unit), meaning it is perfectly suitable for installation in a standard-sized kitchen cupboard.

    You can expect to pay anything between £901.41 and £1,159.05 for this model, depending on your needs and the size of your property. The boiler is supplied with a standard 5-year warranty with the option to upgrade to 10 years, provided it is fitted by a Viessmann trained installer.

    Boiler Energy Efficiency Credentials

    This model by Viessmann is ErP A rated with a seasonal efficiency rating of 90.8%, so it actually exceeds SEDBUK minimum efficiency requirements. It comes with a MatriX cylinder burner and corrosion-resistant stainless steel Inox-Radical heat exchanger that achieves efficiency levels of up to 97%, with a 10-year warranty attached to the latter. The Vitodens 100-W Open Vent also has a modulation ratio of 1:3 to allow the boiler to automatically reduce its maximum output to its minimum output (or to match heating demand) to improve efficiency and appliance longevity. Plus, you can boost efficiency levels by choosing from a range of optional intelligent accessories including the smart tado° thermostat and app.

    Vitodens 100-W Open Vent Technology and Main Advantages

    Viessmann’s Vitodens 100-W Open Vent features a combined pressure release valve and condense connection to save time and expense on installation and maintenance. It is also equipped with a MatriX cylinder burner and stainless steel Inox-Radical heat exchanger, both of which are designed to reduce heating costs and protect the environment.

    The boiler has a user-friendly display with a weather compensation mode which, when installed with an optional weather compensated control unit, enables the appliance to automatically adjust its temperature according to the outdoor temperature. This is a particularly good feature as it helps you to achieve gas savings in the process.

    If you live off-grid, the Vitodens 100-W can be converted to run on LPG (liquefied petroleum gas) instead of natural gas with a simple conversion kit. The boiler’s excellent design also ensures very low operating noise, making it a great choice if you plan to keep it in or near one of your busiest rooms.

    Is the Viessmann Vitodens 100-W Open Vent the Right Boiler Type and Size for Your Home?

    This boiler is ideal for homes with traditional heating systems that comprise of two tanks in the loft and a hot water storage cylinder. It’s also a good solution for properties with an older radiator system and where a lot of hot water is used at the same time. The higher output options will suit larger homes with greater heating and hot water demands, and the lower output units are best for smaller less needy dwellings. As it’s impossible to say which size boiler is right for you without seeing your property or knowing your typical usage habits, you must consult a Gas Safe engineer before purchasing the Vitodens 100-W Open Vent.


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    A-rated combi boiler Save money on your gas bills
    Endorsed by Which? in 2017Tested and recommended
    Low CO2 emissions Environmentally friendly
    Inox-Radical heat exchangerExcellent performance
    Simple backlit LCD touchscreenSimple to operate
    Low level of operating noiseIdeal for installation in or near busy rooms
    Compatible with the tado° thermostat and appFull control of your heating from anywhere and ensures utility bills stay low
    5-year parts and labour warrantyConfidence and peace of mind
    10-year warranty upgrade when installed by a Viessmann trained installerAdditional peace of mind

    Our Honest Opinion of the Viessmann Vitodens 100-W Open Vent

    Taking into account the Vitodens 100-W Open Vent’s impressive features, generous warranty and reasonable purchase price, it would be criminal not to give it the thumbs up. This unit basically gives you everything you would expect to receive from a boiler that has been manufactured by a premium boiler brand but without the hefty price tag. Best of all, it will help to lower your carbon footprint and save you money on those energy bills.

    You don’t just have to take our word for it though. The quality and reliability of this boiler have also been recognised by customers and installers in the UK. How do we know this? Well, Viessmann was awarded Which? Best Buy status in 2017, which proves that there are many people out there that are likely to recommend this model to family and friends looking for a decent replacement.

    Advice on Boiler Quotes and Gas Safe Engineers

    If you and your engineer decide that the Viessmann Vitodens 100-W Open Vent is the perfect boiler for your home, make sure you get quotes from a range of suppliers and installers. This way, you can compare prices and find the best deal on the boiler and installation. You must also choose a Gas Safe registered engineer who holds the relevant qualifications for working on your gas boiler. To check the registration status of a business or individual, simply go to the Gas Safe Register website. Alternatively, you may use our free online service to receive no-obligation quotes from only qualified and registered professionals.


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