OIL boiler flue hole - what diameter hole to drill?

DP · 12 Oct 2016

Is it really important if the OP wants to fit the boiler himself. I say crack on. Someone who needs his hand held to suggest flue hole size, what is he going to need advice on next

RGIs, take a chill pill, why do you guys need an urge to put the world right? It will never happen. In one day came across two installations fitted with PRV to filling loop. System water now can be used as test chart for making white coffee

muggles · 12 Oct 2016

jh75 said:
So given the flue diameter is 100mm, what is the appropriate size core drill bit to use (diameter wise)

Are you sure it's 100mm? Only I've never seen a 100mm flue on an oil boiler. Which make/model is it please? Be handy to know, could get me out of a tight spot one day

As for angling the hole, you often don't need to as the fall will be built into the flue terminal section, your installation manual will give you a definitive answer

jh75 · 12 Oct 2016

muggles said:
Are you sure it's 100mm? Only I've never seen a 100mm flue on an oil boiler. Which make/model is it please? Be handy to know, could get me out of a tight spot one day

As for angling the hole, you often don't need to as the fall will be built into the flue terminal section, your installation manual will give you a definitive answer

It's a woodshitter bosch oilfit boiler

Terrywookfit · 12 Oct 2016

Oilfit refers to the flue not the boiler.

jh75 · 12 Oct 2016

Terrywookfit said:
Oilfit refers to the flue not the boiler.

Yes you're right... lol!

oilboffin · 12 Oct 2016

Some of the old boulter camrays and camray quartets had 4 inch flues but mostly going into a chimney.

muggles · 13 Oct 2016

jh75 said:
It's a woodshitter bosch oilfit boiler

Got a link? All 125mm or 160mm as far as I can see...the 160 has a 100mm inner, maybe it's that you've seen? In which case you'll need a 180mm core

slippyr4 · 13 Oct 2016

muggles said:
Got a link? All 125mm or 160mm as far as I can see...the 160 has a 100mm inner, maybe it's that you've seen? In which case you'll need a 180mm core

Don't waste your time mate, he's said in other threads that he's DIY fitting a gas boiler, the oil thing is just a lie.

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OIL boiler flue hole - what diameter hole to drill?

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