new central heating system

[news]

I am thinking of having a new boiler and radiators at the moment we have micro bore pipes, I have been told by one engineer that I will need new small bore piping and by another that the existing pipework downstrairs is ok but upstairs will need to be change dto 10mm. I intend having a condensing boiler, 7 new radiators with thermostats and relevant controls. Could anyone advise please?

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[Heating-eng]

I would just put a full new system in if I was you.

 

[tamz]

Depends what you want to spend. There is nothing wrong with 8mm pipe if it was fitted correctly. Any rads over about 2kw should be re piped in bigger size as 8mm is too small.

 

[Heating-eng]

Depends what you want to spend. There is nothing wrong with 8mm pipe if it was fitted correctly. Any rads over about 2kw should be re piped in bigger size as 8mm is too small.

8mm is far too small on a old system. Would only just work if brand new.

 

[tamz]

8mm is far too small on a old system. Would only just work if brand new.

Is that right now?

 

[plumman]

Start from fresh, you keep the old copper should help you out a bit, dont use the old bad move,

 

[Heating-eng]

Is that right now?

Yes that's right. I used to train engineers on system design many years ago now but even so ,would not be best practice to use 8mm.

 

[Gray0689]

Yes that's right. I used to train engineers on system design many years ago now but even so ,would not be best practice to use 8mm.

If you trained engineers lol ( think you mean plumbers )
Them you should know what tamz said is correct

 

[Heating-eng]

I trained engineers at BG and best practice was to fit a min of 10mm.
I would never advise to fit a new condensing boiler on old 8mm pipe.

 

[tamz]

I have fitted 1000's of miles of the stuff and it works perfectly well within its limits. If you know system design you'll know it's capabilities.

On a side note just about every new build house done in the last 10 years is piped in 10mm plastic which has in ID much the same as 8mm copper so that must be wrong too?

 

[Heating-eng]

Bet you wouldn't have old scaled up 8mm on your house.

 

[Gray0689]

Maybe he nows better tamz he trained engineers not plumbers like you and me lol

 

[Heating-eng]

I have fitted 1000's of miles of the stuff and it works perfectly well within its limits. If you know system design you'll know it's capabilities.

On a side note just about every new build house done in the last 10 years is piped in 10mm plastic which has in ID much the same as 8mm copper so that must be wrong too?

New pipe and old pipe tends to be different, from my experience old systems on 8 mm pipe struggles to work,

 

[Gray0689]

Your right there but that don't mean it won't work if a customer can't afford to change it then what's the problem it will still do the same job

 

[gaspastemania]

I have done miles n miles of 10mm in new build town houses , now as far as i am aware barretts,persimon wimpey etc pretty much all have same systems it works o.k more concerned about the 25 year life span of push fit and chip board floor ,,,,harumph !!!

 

[Heating-eng]

Maybe he nows better tamz he trained engineers not plumbers like you and me lol

Never said I know better, just trying to give somebody some advise, we don,t have to agree.
BG call them gas engineers not plumbers.

 

[Heating-eng]

Your right there but that don't mean it won't work if a customer can't afford to change it then what's the problem it will still do the same job

Not saying it will not work ,just trying to give advise on best pratice.
New 10mm is a lot different to an 20/30 year old 8mm system.

 

[Gray0689]

Very true mate

 

[Heating-eng]

I have done miles n miles of 10mm in new build town houses , now as far as i am aware barretts,persimon wimpey etc pretty much all have same systems it works o.k more concerned about the 25 year life span of push fit and chip board floor ,,,,harumph !!!

Yes have it in my house (barretts house) didn't work well when I moved in, ended up repiping some of it.

 

[gaspastemania]

I would be more concerned about the wobbly walls when a door slams than the plumbing !!

 

[Heating-eng]

I would be more concerned about the wobbly walls when a door slams than the plumbing !!

Lol... They don't even plaster the walls..

 

[tamz]

Bet you wouldn't have old scaled up 8mm on your house.

I have but it is not scaled up and never will be.
If it was correctly fitted without excessive runs or on rads that are too big and the system is not sludged up it will be fine.

BG are not the best people to quote best practice from.

 

[tamz]

Hardly any new build has plastered walls. All drywall.

 

[dancinplumba]

I have fitted 1000's of miles of the stuff and it works perfectly well within its limits. If you know system design you'll know it's capabilities.

On a side note just about every new build house done in the last 10 years is piped in 10mm plastic which has in ID much the same as 8mm copper so that must be wrong too?

thote it was 6 mm on barrier forgive if wrong

 

[gaspastemania]

You would think BG being the biggest name in heating in the country would set a standard that everyone else would follow .