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Gents, Thank you for your help, I will give the Viessman Technical Department a call in the morning, and i'll post the results to ensure the information is fed back to the forum for possible future questions. Thanks again. Phil

Gents, Thank you for your replys, your help is really appricated. The boiler is the latet spec available and does not have the same wiring as the wiring diagram on the Viessman website! (i assume that the diagram on the web is for the old spec unit). The wiring diagram supplied with the...

Hi everyone. I'm in the process of having a Viessman Vitrodens 100-W System Boiler installed by a very good friend, who's Corgi Registered but not Viessman trained. The Installation was going swimmingly until he came to connecting the cylinder thermostat into the boiler. The instruction...