Eight years ago, I bought the Vitodens 200W. Until now-with annual servicing by the installer all seemed to be going well. The last two summers I could turn the boiler off and depend on the Photovoltaic and solar panels on the roof for water and electricity. Wonderful. 4 weeks ago, there was a leak from the water tank-which was fixed. The boiler has not been able to start since then. 2 electrodes (I had to find them myself with difficulty_75 pounds I think- were replaced.) Now the motherboard-which will cost 700 pounds plus another 200at least to install. The boiler after 8 years is out of warranty. But what next? Can I trust it again? I am 78 and in a cold house for a month at the start of winter. I have lost trust in the boiler. What if something else goes wrong for more money? (This American notepad wont allow me to put pound signs.)