Radiator piping

stranger12

Hi guys,

I am re piping all pipes.

Starting from upstairs i have 4 pipe which are

2x 15 which i think is return and flow for shower and hot tab

2 x 22 which is straight away reduced to 15mm!!

They are radiator pipes

I had few plumbers around and all said radiator flow should be 22 and return 15, is that right? Would it be 22 right into the radiator ?

Will What the previous owner has done which is reducing both 22 to 15 for flow and return cause and back pressure?


Finally how is the pipe connected to the boiler ? Is it 4 from upstairs and guess 4 from downstairs or they are t juctioned before being presented to boiler?

Many thanks

southcoastrgi

I'm guessing you are fitting a new boiler ?
No it's 15 or 10 into the rad valves

Jonesya

Are you doing it yourself?

Reason I ask is there's a lot you need to know and the questions you asked are really just the very basics, loads more you'd need to know before you start.

stranger12

I am doing the pipes my self and have a professional gas registered do the boiler

I have read all around the net people saying rada should be 22mm hence why i asked for opinion

Appreciate any input

cyclonebri1

You normally start of in 22 and tee off to each in 15, collect from each in 15 then into the 22 return. At the far end of the circuit the flow and return runs can drop to 15.

Sorry but you need to understand better, the comment that "2x 15 which i think is return and flow for shower and hot tab" says it all.


You should be able to google a circuit for the type of boiler you are intending to use, there are also companies that will size and design you circuit for a few dollars.

stranger12

Understand and hence why i asked for some opinion . I appreciate not everyone will be as helpful

I realised i had said return and flow for bathroom and there is no return.
It is hot and cold

I think while i was doing the typing i put both rad and hot water as return and flow

So what you are saying is 2x 22 all way around for return and flow which at radiator end is reduced to 15?

Do you know why radiator fitting valve is normally 22 when 15 is all that is required?

DTDfanBoy

Radiator "fitting"? valves are normally 15mm not 22mm.

You really seem to be well out of your depth on this, the design of each heating circuit will vary considerably between systems, you really need a professional to advise how the system should best be arranged to suit your new boiler.

cyclonebri1

stranger12 wrote: »

Understand and hence why i asked for some opinion . I appreciate not everyone will be as helpful

I realised i had said return and flow for bathroom and there is no return.
It is hot and cold

I think while i was doing the typing i put both rad and hot water as return and flow

So what you are saying is 2x 22 all way around for return and flow which at radiator end is reduced to 15?

Do you know why radiator fitting valve is normally 22 when 15 is all that is required?

They aren't, they are made to take a rad valve that takes 15mm or reduced to less.

Again 22mm runners for 75% of circuit both flow and return, run in 15mm for the last 25%.

Yes I am trying to help but get some schematics before you join the hot and cold water at the shower;);):A:A

I think the thing you don't get is that there is a rad, flow and return circuit, and a hot water and cold water supply to all service points.
Again, you need help or leave it to your plumber and save money elsewhere.

In brief, 5 pipes to from boiler;

Gas in

Water in

Hot water out

Boiler output out

Boiler return in

(cold water to services does not run through the boiler)
Learn more or leave alone

stranger12

DTDfanBoy wrote: »

Radiator "fitting"? valves are normally 15mm not 22mm.

You really seem to be well out of your depth on this, the design of each heating circuit will vary considerably between systems, you really need a professional to advise how the system should best be arranged to suit your new boiler.

Some people are really funny

Thanks for nothing

Om my radiator the valve is 22 as it connects to the radiator inlet

stranger12

cyclonebri1 wrote: »

They aren't, they are made to take a rad valve that takes 15mm or reduced to less.

Again 22mm runners for 75% of circuit both flow and return, run in 15mm for the last 25%.

Yes I am trying to help but get some schematics before you join the hot and cold water at the shower;);):A:A

I think the thing you don't get is that there is a rad, flow and return circuit, and a hot water and cold water supply to all service points.
Again, you need help or leave it to your plumber and save money elsewhere.

In brief, 5 pipes to from boiler;

Gas in

Water in

Hot water out

Boiler output out

Boiler return in

(cold water to services does not run through the boiler)
Learn more or leave alone

Many thanks

I know cold water tees off from main supply so the fact i am seeing 4 pipes upstairs to me means

2 times rad which go to boiler

1 times cold supply direct from main supply

1 times hot supply

Am i missing something?

cyclonebri1

stranger12 wrote: »

Many thanks

I know cold water tees off from main supply so the fact i am seeing 4 pipes upstairs to me means

2 times rad which go to boiler

1 times cold supply direct from main supply

1 times hot supply

Am i missing something?

Only the fact that all rads have the same thread, it's not 22mm.
The valves are sized by the inlet side or more correctly the end of the valve away from the rad, as said this is normally 15mm sometimes reduced to 10.

Pay the fee for someone to design the system for you please, or you will probably regret not doing. This isn't needed if you have reasonable knowledge, but experience matters here.