Pipe layout advice required please

wadge

I'm putting the pipe work down for CH in a 2-up 2-down house I'm refurbing. RGI will be fitting the boiler.

I'm using plastic throughout except for where the pipes will be seen. I've read (here) that copper must be used within 1 metre of the boiler. Is this to safeguard the plastic against the hot water coming out of the boiler?

Altogether, there will be 6 rads and 2 medium towel rails. Can I use 15mm throughout?

Thanks

muggles · Posted: Mon Jul 14, 2008 9:16 pm Post Subject:

Yes you must use copper within 1m of the boiler (some mnaufacturers state 1.5m)

I'd go for 22 on the main circuit, as a rule we never supply more than 2-3 rads off 15mm, depending on size. If you want to get scientific then there's a calc you can do to work out the pipe size - each size has a maximum capacity for thermal transfer over time, and it should really be matched to the rads you're fitting if you want to be really technical about it.

wadge · Posted: Tue Jul 15, 2008 3:58 pm Post Subject:

Thanks.

So 22 as the main line but 15 tee'ing off to each rad is OK?

wadge · Posted: Tue Jul 15, 2008 10:18 pm Post Subject:

Softus · Posted: Wed Jul 16, 2008 12:17 am Post Subject:

wadge wrote:

So 22 as the main line but 15 tee'ing off to each rad is OK?

That would be adequate for this size of house.

Bambergaspipe · Posted: Wed Jul 16, 2008 1:24 am Post Subject:

[quote="Softus";p="952490"]

wadge wrote:

That would be adequate for this size of house.

Would the boiler size be adequate Whoops , Sorry you haven`t asked..

throw in a 24kw eh?

Softus · Posted: Wed Jul 16, 2008 6:43 am Post Subject:

Bambergaspipe wrote:

Would the boiler size be adequate

Not my concern. You go ahead and ask, if you want to.

Bambergaspipe · Posted: Wed Jul 16, 2008 7:10 am Post Subject:

Softus wrote:

Bambergaspipe wrote:

Would the boiler size be adequate

Not my concern. You go ahead and ask, if you want to.

Not mine. You`re the one doing the pipe sizing....

Softus · Posted: Wed Jul 16, 2008 7:16 am Post Subject:

Bambergaspipe wrote:

Not mine.

Well get back to your your bottle then.

Quote:

You`re the one doing the pipe sizing.

For heating, not for the gas supply. Read the OP, if you can still focus.

namsag · Posted: Wed Jul 16, 2008 7:33 am Post Subject:

Some manufacturers say NO plastic at all on pressurised system one of the worcester boilers have it in the instructions

Bambergaspipe

Quote:

Can I use 15mm throughout?

Read this Softus.

P.s. ( I don`t drink, fool, it was all a hoax ). what a Gonk....lol.

namsag · Posted: Wed Jul 16, 2008 7:48 am Post Subject:

It is not just the size of the house that would dictate wether 22mm is adequate for the rads depending on what size boiler it will be in manufacturers instructions wether it stipulates a certain amount of 28mm pipework.
But in this case it would look unlikely

wadge · Posted: Wed Jul 16, 2008 8:06 am Post Subject:

So to be on the safe side:

22mm (copper!) gas feed to the boiler
22mm (plastic) feed and returns
15mm (plastic) branching off to the rads

Softus · Posted: Wed Jul 16, 2008 8:59 pm Post Subject:

wadge wrote:

So to be on the safe side:

22mm (copper!) gas feed to the boiler

How did you determine that?

wadge · Posted: Wed Jul 16, 2008 10:02 pm Post Subject:

Well, that will be upto the RGI to fit after seeing what the boiler manufacturer recommends.

I take it you concur with 22mm for the feed and returns, and 15mm branches/tees to the rads?

But at least I can start laying pipes whilst the boards are up.