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OK, well 1:10 is lower than 1:7 and 1:4 so look at it that way. Check the flow rate at your cold tap in the kitchen with a measuring jug and timer. If you have 11l/m go 25KW boiler, if 13 go 12l/m and 30kW, 15 go 14l/m and 35kW unless you like really hot water at the tap. Viessmann isn't...

Frankly none of the above even if I didn't work for Vokera and my life doesn't depend upon it but my wife does (we have one). Vokera Unica Max 30 or 35C depending on your cold main. Large stainless bore hex, OpenTherm with or without weather compensation. Plastic is not bad, there re many...

Beat me to it!

Saying you have difficulty using smart devices and apps on a forum which is accessed with a smart device and an app is, well, a little odd. Better perhaps that the original poster heed the chap who knows how things work than the correspondent who declares he or she doesn't using the media they...

The Ciao is now the X model which in the UK we know as the Vokera Vibe Max, the 24CSI I think has an aluminium heat exchanger, the new Ciao has the stainless exchanger. The Vibe Max and other variant have been very successful in the UK

What type of heaters Beretta make dozens?

Is the boiler fitted with an ali or stainless steel heat exchanger

Don't know about Worcester or Baxi, most combi's have a hot water 'power' and a lower heating output. Better combi's can be range rated on the heating output. Range rating means the maximum heating output is limited eg a three bedroom semi built in the 30's with solid walls is very unlikely to...

Deleted

You are a very careful consumer and an ounce of preparation is worth a pound of cure but in the end you'll have to trust somebody.

To the cynics; if the manufacturers are lying then call them out. With the correct amount of gas and a stated flow rate the combi boiler will raise that flow rate by the temperature claimed, this is confirmed not in nirvana but a lab and then certified independently (there is a tolerance but...

No and yes

Fell foul to this myself on non-heating wiring. It feels good when the penny drops, or as in my case, is explained.

Yes, the internal bypass is a boiler protection device to ensure there is always an adequate flow across the heat exchanger. Frankly the boiler manufacturer has little control on what happens outside the product but generally one radiator of decent size with only lockshield valve control preset...

Just re-reading earlier posts. The control will be fitted to system or combi boilers, that's why there's a DHW schedule, we do the same. Are there preheat options on that boiler? 24 hour, touch n go or smart preheat?

I might have remembered past post badly. There may be an anti-cycle delay but it is not adjustable as on other boilers. The timeline is jolly annoying when trying to attribute a time to an occurrence, if I were a Viessmann installer I'd write and ask for a datum pointer at the three hourly...

What does the Y axis represent on the burner on graph? There seems a 9⁰C ∆T on F&R which o think is good on a low temp system. I mentioned FB as there are groups of Viessmann installers on there very knowledgeable who have confronted these issues before and may be able to help.

I don't know the Viessmann that intimately but on some boilers you can raise the minimum or lower the max but not the opposite. It should be in the manual.

I've seen similar threads elsewhere with the 200's. Not an expert on Viessmann's but I watch the posts closely. The company have put all their efficiency ambitions into the wide modulation which has considerations of it's own There is no anti-cycle delay nor heating after hot water delay, it...

It's a strip out and start again. You'll need a boiler and a hot water cylinder either unvented or vented dependent on cold main pressure and loft space. Shop around for an experienced engineer. How many is quite a few heating engineers? Find more. Don't use the flue again.