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It seems as though Viessmann is winning this battle of the titans to me, unless all you fans have shares in VM ! It is not really viable for us to have a combi or any boiler that needs to run on a pressurised system, so its a regular vented heat only boiler really. Its nice to hear...

Thank you for the phone number. I can't see a regular boiler in the range. I need a boiler for an open vented heating and water tank. Does a system boiler suit a heating cicuit with a header tank ? Thanks

Thank you for those replies. I was surprised to learn of the Viessmann reliability problems and pleased to hear they are resolved now. I have always felt comfortable with German engineered products. I guess as Bosch are involved with Worcester now there is a German aspect to both...

We need to replace our gas CH boiler. We need a regular boiler for our open vented system plumbed Y plan with a rating of around 15kw. The efficiency and warranty of the Viessmann Vitodens 100 WB-1 18kw looks attractive,but reading on here there seems to be some reliability issues with other...