Minimum Distance from Boiler before fitting Speedfit?

Mike2007

Mike2007

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Hello,
I have a Greenstar Heatslave 18/25 combi, whats the best distance from the boiler before it being possible to change to plastic?? Bosch-Worcester say "Do not use plastic pipework on sealed systems"!!

Are they covering their ass or is this perfectly true for this boiler in sealed system?
Thanks
 
Mike2007 said:
Hello,
I have a Greenstar Heatslave 18/25 combi, whats the best distance from the boiler before it being possible to change to plastic?? Bosch-Worcester say "Do not use plastic pipework on sealed systems"!!

Are they covering their ass or is this perfectly true for this boiler in sealed system?
Thanks
Click to expand...
Reason is-if your overheat stat fails on sealed system then you're gonna get high temperature in that there plastic and it's liable to go POP! :shock:
 
POP..umm is this quite likely or not! I mean its seems very common to use this install method?? I like copper but if two plumber's quoted for a job which one would get the job, the 100% copper guy or the duel material fix guy at his cheaper price?
 
The person who wants to fit a sealed heating system in plastic pipe should be regarded as a potential cowboy!

A sensible owner would get each installer to quote for both copper and plastic.

Any professional installer could quote for either!

My view is that plastic is unsuitable for heating systems because it cannot stand double fault conditions!

Tony
 
Most boiler manufactures state 1.5m before the use of PP.
We routinely install 90% poly systems into local authority and government funded key workers housing and new builds.
For instance a sealed system boiler with the first 2 mtrs or so in copper then progressing into polypipe for the heating carcasss and domestic carcass any visable pipe is finished in copper tails ie rads cylinder feeds.
We always pressure test our systems to industry standards, as the biggest problem with pushfit is the damm stuff not being assembled 100% of the time.
The system is protected by a, the room stat B. cylinder stat, c high limit stat on boiler, d, temperature relief valve 1 ( on boiler) e, High limit stat on unvented cylinder ( in this example) f, Temp relief valve 2 ( on clylinder).
If poly is installed by competent tradesman its fine maybe we should ban it for d.i.y usage lol :)
 
Thanks MrBenchmark,
Good to get the straight story. I love working with copper pipe, even though my flux fumes don't fill me with joy! I was very reluctant to use plastic, but less house owners really care now.
What pressure do people test the push-fit to?
 
MrBenchmark said:
Most boiler manufactures state 1.5m before the use of PP.
We routinely install 90% poly systems into local authority and government funded key workers housing and new builds.
For instance a sealed system boiler with the first 2 mtrs or so in copper then progressing into polypipe for the heating carcasss and domestic carcass any visable pipe is finished in copper tails ie rads cylinder feeds.
We always pressure test our systems to industry standards, as the biggest problem with pushfit is the damm stuff not being assembled 100% of the time.
The system is protected by a, the room stat B. cylinder stat, c high limit stat on boiler, d, temperature relief valve 1 ( on boiler) e, High limit stat on unvented cylinder ( in this example) f, Temp relief valve 2 ( on clylinder).
If poly is installed by competent tradesman its fine maybe we should ban it for d.i.y usage lol :
Click to expand...

never read so much *******s for a long while

plastic is for cowboys
the tradesmen among us prefer a bit of pride in our jobs :roll:
 
Mr Benchmark, is the firm you are working for using 90% plastic because:-

1. Its a better material and does a better job?

OR

2. Its quicker and cheaper to fit?


Do you really believe that a system fully plumbed with copper is inferior ?

What would you think about working for a firm that does quality work and ONLY uses copper pipe except in very special cases?

Tony
 
Agile said:
Mr Benchmark, is the firm you are working for using 90% plastic because:-

1. Its a better material and does a better job?

OR

2. Its quicker and cheaper to fit?


Do you really believe that a system fully plumbed with copper is inferior ?

What would you think about working for a firm that does quality work and ONLY uses copper pipe except in very special cases?

Tony
Click to expand...

1 pleese

2 only if you employ muppets

he couldnt cos he dont know how BTW you don't do installs :wink:
 
MrBenchmark said:
Most boiler manufactures state 1.5m before the use of PP.
We routinely install 90% poly systems into local authority and government funded key workers housing and new builds.
For instance a sealed system boiler with the first 2 mtrs or so in copper then progressing into polypipe for the heating carcasss and domestic carcass any visable pipe is finished in copper tails ie rads cylinder feeds.
We always pressure test our systems to industry standards, as the biggest problem with pushfit is the damm stuff not being assembled 100% of the time.
The system is protected by a, the room stat B. cylinder stat, c high limit stat on boiler, d, temperature relief valve 1 ( on boiler) e, High limit stat on unvented cylinder ( in this example) f, Temp relief valve 2 ( on clylinder).
If poly is installed by competent tradesman its fine maybe we should ban it for d.i.y usage lol :)
Click to expand...


Thats all well and good but the O.P. was talking about an oil fired combi boiler-these are the ones that worcester say no to plastic if fitted on a sealed system. The overheat stat on these doesn't cut in until about 110 degrees which is getting a bit on the hot side for plastic and thats why they say no plastic on oil fired sealed sytem boilers.
 
kevplumb said:
so regardless of if you have some pride in your job

we should now start worrieing about the heat source :roll:
Click to expand...
Yeh you should worry about the heat source cos the ones with no pride in their job are gonna fit plastic no matter what the M.I.'S say.
 
chr15 said:
kevplumb said:
so regardless of if you have some pride in your job

we should now start worrieing about the heat source :roll:
Click to expand...
Yeh you should worry about the heat source cos the ones with no pride in their job are gonna fit plastic no matter what the M.I.'S say.
Click to expand...

so why should i worry cos i don't use the ****e :roll:
 
The origional poster asked if it was ok to use plastic on a worcester heatslave greenstar model when the M.I.'s tell you otherwise, I explained why they say not to,so regardless of whether you use it or not,thats the answer to his question. :roll:
 
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