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 Post subject: 28mm gas feed necessary?
PostPosted: Tue Nov 07, 2017 2:07 pm 
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Hi all.

I had an RGi visit yesterday evening for the combi upgrade survey. He had a look at the meter and said
the 22mm gas pipe will need to be upgraded to 28mm, something to do with 1mbar differential.
This means a fair amount of work to replace as the existing supply has at least:

Pipe run is:
At least 2 bends
1.5 metres horizontally from gas meter
Then vertically 3 metres (from room above)
and then across the landing around 4metres to the chimney area bbu.

The new combi will be 3 metres away from the chimney area ideally.

The only other gas appliance after the combi upgrade would be a 4 ring hob.

He's the only RGI who mentioned this so far, is it absolutley necessary if I had a Eco Rf36 installed
or can I get away with a smaller Kw combi?

Advice greatly appreciated.


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PostPosted: Tue Nov 07, 2017 2:58 pm 
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From the dimensions you have posted and assuming there are probably more bends/elbows hidden, I would say yes he is correct, especially if the gas hob comes off the boiler gas supply pipe.

At a guess it will need 28mm up to the tee for the hob, then 22mm from there to the boiler, but without seeing the situation I can't accurately say.

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www.drlgas.co.uk


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PostPosted: Tue Nov 07, 2017 6:56 pm 
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If you only have one bathroom the ECO 30 will be more than enough. Ignore the published flow rates they are the absolute minimum unlike most manus that hype the maximum :wink:

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PostPosted: Tue Nov 07, 2017 11:47 pm 
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Mind at ease... Yes it's 1 bathroom 8 rads.

It was a surprise, good thing I asked here!


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