On 17 Aug, 10:00, Peter Scott wrote:
Tim Lamb wrote:
Anyone know anything against Viessmann boilers? Specifically Vitodens
100-W.

Plumber has probably just done a training course:-)

I note their 5 year warranty only works if it is installed by one of
their trained operatives!

regards

The latest edition of Which? magazine has a members' survey of gas
condensing boiler reliability. The first figure is the percentage of
people whose boiler malfunctioned over the first years after
installation. The second is the percentage of people who would recommend
one to someone else. The number in brackets is the number of respondees.
The results a

Vaillant(426) * 26 * * *66
Worcester(927) *29 * * *66
Alpha(64) * * * 42 * * *52
Baxi(250) * * * 38 * * *49
Glow-worm (287) 39 * * *51
Potterton (188) 36 * * *47
Vokera (34) * * 29 * * *62
British Gas(203)36 * * *37
Ferroli(34) * * 41 * * *50
Halstead (30) * 53 * * *50
Ideal (163) * * 44 * * *36
Keston (34) * * 76 * * *26

Viessman not mentioned.

What struck me was how b****y awful the reliability figures are. For
even the best ones a quarter failed in the first four years. Is it
because these condensing things are relatively new and the manufacturers
are still experimenting?

Peter Scott

I would say that most failures were caused by installation faults
..
Earlier ecoTEC's for e.g. 3 years old are suffering from split hoses,
faulty Wilo pumps and pressure switches, however all issues have been
resolved now.