15mm OK for internal condensate piping?

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Given the low flow rate is it OK to use 15mm for a 3m internal condensate plastic pipe run from the boiler (condensing replacement, to be installed) to the kitchen sink. It has to go through one brick wall and and behind a free standing fridge which is why I'd like it to be fairly thin and inconspicuous.

I have emailed Worcester Bosch Group and they replied (on the same day!)

Unfortunately only 22mm condense pipe work can be used.
It is an industry standard that the condensate pipe comes in that size.

I also emailed Vaillant and heard nothing. I have searched around and I am surprised that noone else has asked the same question. Thank you.
 
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They told you, no smaller than 22mm standard overflow pipe. you must follow MI rules don't give yourself problems.
 
Basically that.

I dont know what the options are in terms of using a tundish and 15mm from there?

Daniel
 
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Many thanks for the comments. I'm going to go with 22mm. Can always replace it with 15mm in 2 or 3 years time if it turns out that this is fine.
 
No you can't

The manufactures instructions will say minimum 19/22mm
 
If using a condensate pump they usually use right down to 10mm.
Plastic naturally.

The 22 mm condensate is just working with the idea that there is a steady fall and to prevent blockages.

Let common sense prevail.
 
Many thanks for the comments. I'm going to go with 22mm. Can always replace it with 15mm in 2 or 3 years time if it turns out that this is fine.

why don't you listen ffs it's got to be plastic not copper ie overflow pipe
 

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