New Viessmann Vitodens combi boilers such as the new Vitodens 050-w are the best selling gas boilers in Europe. They boast some of the most reliable boilers all at fantastic low prices. You can get the new Vitodens 050-w combi boiler installed in your home for under £1,900. This combi boiler is super compact, which makes it perfect for kitchen cupboards or homes with not much space. We believe that the 050-w is one of the best combi boilers on the market it terms of price and value. It's bigger brother, the Vitodens 100-w combi boiler is Viessmann's best selling combi boiler. It is powerful, compact, and comes at a great price. It does cost more than the 050-w but it comes with an extra 2 years warranty, meaning you get 12 years instead of 10 years.