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Not into statistics... TS asked for opinions... I'm just offering mine... If you don't like it...ignore it... It's not that hard... Cheers...

Now there's an opinion I wholeheartedly second...

It's located in Belgium...You could have guessed by looking at my profile... I've spent the better part of 2016 inquiring Viessmann...Buderus and Atag installers... Had one type of boiler of each brand in mind... Scoured loads of forums just to have an idea about the pros and cons of each...

Here comes the anti Viessmann gang... Extremely happy with my Vitodens 222F B2SB...(2017) Just find yourself an installer with a decent warehouse supply inventory... This is how I chose my installer...and lucky for me...he lives less than 5 miles from my place...

Owning a Viessmann Vitodens 222-F B2SB (130L boiler) since March 2017... I am extremely satisfied with both comfort and consumption... Had a Vitoconnect installed at the same time which extended the total warranty to 5 years...(Radial heat exchanger has a standard warranty of 10 years) WC takes...

If you have weather compensation your boiler's heating curve needs to be adjusted upwards... Check the manual on how to do that...or the video below... Best to to this with increments of 1...

You should probably try increasing the heating curve first, which determines to what T° the CH water is heated in relation to the outside temperature... I'm sure it's in the boiler's manual somewhere...

I had a Viessmann 26kW Vitodens 222-F B2SB 130 liter combi boiler installed last March... Though the WC is something you have to adjust to it hasn't given any problems so far... But you need to learn about the heating curve/inclination... DHW production is truly great... Right now...with an...

An aquastop...:)

No 'aquastop'...too bad...

Should work on a CM907 as well...

Left and right from the controller on your boiler there are two sliders... The left is for the pressure gauge and reset button... The right is where the on/off switch is located...