help identify this boiler noise please

[pgtips]

after a bit more searching although I didn';t pin down the noise I found the symptoms of my boiler aren't unique
see here http://baxi-solo-repairs.co.uk/Baxi Solo HE.html

Unfortunate for me the route really is a replacement but maybe this information will assist someone else. Baxi Solo HE 24

PG

 

[FlyingFish]

When your service guy looked at the boiler did he check the combustion figures (not just gas pressure) and were they in spec? Normally a faulty burner or gas valve would show up on an analyser.
For me it sounds like heat exchanger kettling, get some cleaning chemical in there. Start with something mild and work your way up to some of the more serious chemicals. Bare in mind the solo he heat exchanger isn't the most robust. So watch out for leaks.

 

[pgtips]

yes the readings were close to him having to turn it off.
More research shows that the boiler I have has a known design fault. What this means is that no matter how much I patch it up it is doomed to fail.
It is very annoying but I'm not going to throw money at it, I'll run it until its beyond use then get another installed, I have some time to source a replacement.
Thanks again for everyone help.

 

[FlyingFish]

Wise choice, Ive replaced about a dozen or more of those heat exchangers over the years. Pick something with a stainless heat exchanger, much hardier

 

[pgtips]

Pick something with a stainless heat exchanger,

sound advice, any recommendations? I need at least 28kw, the baxi was 24 but from what I now know 28 would be more suitable.

this looks respectable at 26kw, I am sure price can be improved.
http://viessmanndirect.co.uk/Catalo...ers/Vitodens-100-W-26kW-System-boiler-B1HC029

 

[FlyingFish]

I always used to recommend Vaillant heat only boilers as they had wonderful stainless heat exchangers with copper flow/return pipes straight out of the boiler, no messing. But I believe only the largest one in the range still has a stainless heat exchanger (38kw, I think?) you would need to check. Now although you can range rate these boilers down to your requirements (which is great) Building regs dont allow you to over spec a boiler size for your property!

 

[FlyingFish]

Just checked and it looks like the 438 is the only stainless heat only model, 6.3-38kw output @80C

Just seen your link above, that boiler is a system boiler, not heat only. But Viessmann do use stainless heat exchangers. Me personally, I think that some of their design decisions are questionable, but thats just me

 

[pgtips]

my mistake, the link should have been this one
http://viessmanndirect.co.uk/Catalo...s-100-W-26kW-Compact-Open-Vent-Boiler-WB1B319

what design problems did you find, more for my interest now , I won't be fitting it.

many thanks

 

[petit_pablo]

So your replacing the boiler for a simple fault? Your choice.

Edit: ive just read that website link (the baxi solo one). Awful page and tells you bugger all except to call him.