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Does the pressure go down when the boiler cools. If it does it is the expansion vessel in need of a service.

Remove the plate heat exchanger. Fill the primary side with FX2. Wait 30 mins and flush. Repeat. Place back in the boiler and test. Do this all the time and always works. If you want to prevent it repeating fit a Spiro trap to the return to the boiler. Magnacleans have a high failure rate. I...

I'll try but it's hard as I'm a heating snob. Your system sounds very interesting. I hope in the future we can have fruitful and civilised discussion about many things including your system. Merry xmas. Andrew.

There you go sinking down to sarcasm again. Dan you really need to grow up. The viessmann in my opinion has the best weather comp. It's pretty much the only boiler I ever see fitted with it. Vaillant tell me there's dosn't work properly and Keston on there training course said it doesn't work...

Gas wizard. Please explain your comment about viessmann and 7% co2.

It's not the boiler but the way it is controlled a Viessmann without weather compensation is no more efficient than most other boilers. Ok some boilers fitted on underfloor systems will perform extremely well. But most systems I'm doing are replacement boilers on rad systems. I'm sure you know...

Are you talking about the 100 or 200?

I'm certainly able to raise temperatures on this forum. My opinion is my opinion. I don't attack yours. I am only telling it as it is. Do I need witnesses? One of the reasons.I've been pursuing this argument is to establish a view on connecting to cast stacks. I'm not persuaded. When I get such...

I'm certainly able to raise temperatures on this forum. My opinion is my opinion. I don't attack yours. I am only telling it as it is. Do I need witnesses? One of the reasons.I've been pursuing this argument is to establish a view on connecting to cast stacks. I'm not persuaded. When I get such...

I'm certainly able to raise temperatures on this forum. My opinion is my opinion. I don't attack yours. I am only telling it as it is. Do I need witnesses? One of the reasons.I've been pursuing this argument is to establish a view on connecting to cast stacks. I'm not persuaded. When I get such...

Never. I live and work in an area that has mainly 3 bed houses and terraces and only a few modern flats. Most of the boilers I replace are already condensing boilers. An occasional low water content b oilers, and replacement combination boilers. I have a cast stack chain cutter I inherited when...

Merry xmas doitall

Good not void.

Dan, you misunderstand. When I say viessmann use marketing I mean they lie too. You seem to be fixated on attacking me. I've got you down as the school bully when you were at school. Are you that really tall guy who thinks he the worlds best heating engineer?

Thanks gas bod. I'm still unlikely to adopt this approach bit it's void to know a sour,e of reference.

How did plenty become slappers? Predictive text and a lack of proof reading.

In the years I worked for viessmann I never came across any boiler discharging into a cast stack. Slappers of other incorrect scenarios though. Viessmann use marketing like every other company. Couldn't find the technical bulletin. Seems the gas safe technical boys can't agree either. The...

Still have're found any source I would deem credible enough to persuade me to discharge nitric acid into a cast iron stack. Only reports about the corrosive effect of condense. Also never had a job where I needed to discharge into a cast stack. Couldn't find anything on gas safe site. Found a...

Building research and gas safe say don't. Can't find any info saying it's ok. My personal experience says don't. So Dan I ask you again without attitude and sarcasm what is your source for saying it's ok to discharge condense into metallic pipes. please attempt to give a helpful and constructive...

You sarcasm denotes a flawed personality.