YES - Worc Bosh 28i Junior Combi Boiler Delivered! – Thanks Everyone!!

[ek_1986]

As labelled really, as many of you will be aware I have been on the search for a new boiler and with the aid of you help and support, I have managed to find the right one for me!! I’m hoping this is going to save me a killing compared to my 18 year boiler. I’m meeting Chickensoup this weekend to get is swapped over, just hoping its going to be straightforward now (fingers crossed) 

My only concern is the existing piping is 15mm and I am really hoping the upgrade to 22mmwill not be necessary. We are going to test the pipping to check if its passes.. I’ll keep you guys in the loop what happens!

I know many of you suggested I try it myself but I am bit worried when it comes to messing with Gas so I figured its better paying someone to come and do the work, although I am hoping to assist and learn along the way 

Again, I just want to thank you guys for help and i’ll keep you in the loop! I’m hoping to get some pics I can post up which may assist those of you that are considering doing it yourself. If anyone has any tips, pointers before Saturday it would be much appreciated! I am really exciting about it all!!

I’ll be sure to let you guys know what the boiler is like as well! Its much smaller than my existing one

[Amy]

Good to hear of another convert

The only pipes that need to be 22 are the gas, flo and return

Did you get the optional integral filling loop too?

[wyleu]

If you do the gas pipe try to keep the number of turns to an bsolute minimum.

[ek_1986]

Hi Amy, glad to hear from your again  I'm hoping the existing pipe work will pass the necessary testing. Quick question though, providing the existing pipe passes the test, I am guessing there wouldn’t be any need to upgrade the piping? Would the gas pressure ever change or drop though? needing someone to come out to change the piping?

I'm not sure whether to change upgrade the piping regardless? Any thoughts?


Flu Kit - just the standard one, not sure about the filling loop but I’m sure it'll be fine. I wasn’t too sure about the flu kits so I got Chickensoup to double check and was al okayed 

wyleu - spot on and good point! I'll be sure to try and avoid unnecessary turns. I am really hoping we wont need to upgrade the piping. My only concern is whether the existing pipes would have any furture ramifications???

[Amy]

The law currently requires that the gas pipe be 22mm.  This doesnt apply to existing boilers which were installed before the regs changed c April 2002, but anything since, must be to regs.

I shall say no more because i know rules get broken bent and ridden over roughshod.  Some might say that common sense could prevail and if the pipe run was short and straight, it might suffice to remain as 15mm, ...........but of course I couldnt possibly comment.

[Flamethrower_]

I have to agree with Amy here, that the gas supply should be 22mm

especially when you are fitting a combi boiler that is rated at 28 KW ! if you get that wrong the sh*t could hit the fan!

[Amy]

The problems arise for the person fitting it. A CORGI installer knows what has to be done. If its not and is found out to be so, its his number on the ticket.

If a non corgi person does it, and its found to be lacking, its the high jump for them too.

Damned if you do and damned if you dont

[Flamethrower_]

Amy,

I hate to tell you this there is no such thing as a Corgi installer now !... it is the Gas Safe Register now !... confusion reigns for every one

[Amy]

You silly boy

im being like my Nan, who would take years to get up to speed with new developments, but unlike my Nan, im doing it for devilment, ........cos i can. 

[Flamethrower_]

Heh heh heh, 

Confusion..... he say ......what !

[PhatBob]

im being like my Nan, who would take years to get up to speed with new developments, but unlike my Nan, im doing it for devilment, ........cos i can. 

Are you *sure* that your Nan wasn't doing it for devilment too?

[Amy]

Yes im sure

she had an incurable dose of verbal diorhea closely allied with continued onset dementia 

[chickensoup]

Amy,
       As far as I'm aware the law doesn't state that a 22mm pipe has to supply the appliance, it usually stipulates that the supply has to be of adequate size to supply the appliance when all other appliances in the property are on maximum heat output.....( usually meaning it passes the pressure loss test) read the pipe sizing chart in the OLD corgi book and you'll know that a 15mm pipe could satisfactorily supply a 28kw appliance.
                      The 28 junior does have a 22mm gas fitting.......so does the 12/15 RI(heat only) but it also states in there manufacturers instructions that they can reduce down to 15mm as long as it satisfies the above requirement.

                          hope that helps            chicken x

[Antman]

From the engineering perspective, you might also ask the question why, if 22mm is stipulated, that some boilers still have manufacturer fitted pre-formed 15mm supply pipes...

Why not supply a 22mm connection at manufacture?

Antman

[wookey]

So far as I know chickensoup is right - the pipes have to support the speciifed max pressure drop at full waz. And tables show what pipe size that requires for a given power output and run length. If there is an absolute requirment for 22mm then it's new. It is true that 15mm doesn't get you very far at all in practice at combi rates.