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Does the boiler switch on and off when you run hot water? How are you judging that it gets very hot?

In my experience of the viessmann system most people do not understand how it works, but it works very well. I think you wold have trouble moving away from viessmann in the future but that would be due to your satisfaction with their advanced technology. Shame they have developed a poor attitude...

I don't advise calling any one from the Viessmanns list. This list contains any one that has attended a one day course and includes a lot of numpties. If the Viessmann engineer that attended was even a little helpful he would have identified the fault for you. This is common for company men to...

The diverter valve on the Viessmann boiler has been very problematic. It is however very simple to replace. It is worth contacting viessmann to ask for this to be fixed under warranty. If you warranty is over ask anyway as this is a known fault. The replacement parts are reliable. Dirt in the...

Gas is more economical than electric. I don't think your boiler is a combi. It is likely to be either a heat only boiler or a system boiler. The combined temp and pressure relief valve dripping usually indicates that the expansion vessel requires repressurizing. Some cylinder have an integral...

OK, after all that jazz - look at a Viessmann Vitodens 100-W Compact Heat-only Open Vent which can be equipped very easily with weather compensation. If fitting all new controls, get a W Plan valve [2 position 3 port] and use a Viessmann plug-in timer. Good sound advice.