Advice on a new system

[F49h]

Cheers Guys , gonna run it up the outside. The water I will T off my cold water supply from my HW tank and run it alongside the return pipe to the boiler. My theory is if it is cold enough to freeze then it's cold enough to have the boiler on.

 

[Grumpy old Plum]

Hi
IF running in plastic internal bore not the same as copper and anything over 24KW pipework size should be increased any way

 

[SimonG]

:smilielol5:

 

[Best]

You would be better to find a decent engineer who doesn't rip you off & let him get on with it tbh.
First fix is just as important as the rest of the work, but shouldn't be the major wage cost of the entire job.
Copper pipe is my preference, but no doubt plastic could be okay. Hope you don't have mice! Or that the boiler doesn't someday overheat & melt the pipes. :smile:
If you rang me up & asked me to join to your work without prior consultation, I would be wary of the install, but same would apply if a plumber had done it, to be fair.
It's a free country & if you feel you can obtain enough knowledge & are fussy & are confident & competent , then genuinely good luck. Most of the plumbing work I see done with clever hands on engineers of another profession, are a mess.

 

[F49h]

Been a Marine engineer for 20 years +. The outside pipe will be copper. Approx 6 meters before it enters into the loft space. Rest will be plastic with inserts and compression.. Cheers for the advice guys.

 

[Ermintrude]

Don't run it outside . Why not get a cable tray and fix your 6m length of plastic coated copper to it, lower it in then fix the tray back at top and bottom . If it's cold enough to freeze outside your house will be warm and boiler knock off and oooooh Jack Frost gets to work

 

[F49h]

Good idea never thought of that!!! Doh

 

[Ermintrude]

Good idea never thought of that!!! Doh

If it's been a solid fuel chimney it will cause lots and lots of corrosion as the tar is nasty stuff.

 

[Worcester]

Cheers Guys , gonna run it up the outside. The water I will T off my cold water supply from my HW tank and run it alongside the return pipe to the boiler. My theory is if it is cold enough to freeze then it's cold enough to have the boiler on.

And that's when you get the power cut - and oopss wet everywhere! That's why if we MUST use a monobloc Air source Heat pump we will install glycol and a plate hex.

And why would anyone install a new oil boiler anyway when they could probably get the lot done by a professional under the RHI scheme and still be quids in. - ha'peth of tar comes to mind. Do it on the cheap and regret for 20 years.

 

[Worcester]

And don't forget to multi-zone the house if you can, the more zones the better all houses really should be a minimum of two zones, and B Regs require it if >150m2 - then again you have checked all the building regs requirements haven't you..

 

[Worcester]

Interesting ..... Just found this on the polypipe website

"Pipes and fittings should not be fitted to a sealed system oil boiler" - See more at: Connections to other equipment | Knowledge Centre | Plumbing & Heating

 

[Worcester]

it goes on to say:

"The use of plastic pipe and fittings is acceptable when used in oil fired installations where the boiler is connected to an open vented system"
and
"Where a sealed system oil fired boiler is to be used all primary boiler pipework to and from the hot water cylinder (if fitted) and any radiator or towel rail circuits must be installed using metal pipe and fittings."

mmmm.....