how does my proposed central heating layout

[Joedeath332]

So we are doing up 3 bedroom bungalow and i am "Trying" to working out the cental heating pipe layout and have done a sketch to get some opinions whether it is ok or if not what i need to change.
Most of the floors are concrete and the pipework used will be 22mm & 15mm copper which will be insulated & sealed with gaffer tape , ( to stop corrosion from the concrete ) then placed in the tracks made in the concrete floor, then re cemented.
The boiler still has to be picked but it will be a gas combi boiler.
Please take it easy on me as this is all new to me
here is the sketch , sorry its a bit grainy.
https://ibb.co/eySkbc

 

[John D v2.0]

The only comment I have as also non professional person is Just make sure the pipes have a bit of movement especially on the longer runs. A tee embedded in concrete will effectively lock the pipe in place, so make sure there's enough give in the insulation to handle the expansion.

 

[Joedeath332]

Thanks I never thought about the expansion / contraction.
The insulation i will be using is that heavy black stuff , and it will be concreted under the floor in 3 rooms , the rest is under floor boards , ( yes i know stupid design of a bungalow , half the rooms have concreted flooring and the other half wooden floor boards sitting 2-3 inches above concrete floor.
The longest straight run of 22mm will be 3mtrs long , my pics scale is not realistic at all
The average size of each room is 12 x 11 ft

 

[picasso]

Have a look at putting in a manifold if you have the space and running 15mm plastic pipes to each radiator, that way no joins under the concrete, uses a lot more pipe but its a better system. (in my opinion anyway)

 

[Joedeath332]

Have a look at putting in a manifold if you have the space and running 15mm plastic pipes to each radiator, that way no joins under the concrete, uses a lot more pipe but its a better system. (in my opinion anyway)

Thanks for the suggestion about plastic pipes, would this not mean that if I had 9 radiators I would the need to track a large enough track in the concrete floor at the boiler to accommodate 18 x 15 mm plastic pipes?? (2 for each radiator) or am I mistaken

 

[John D v2.0]

Manifold works best if you can put the manifold in the centre of the house and the pipes out like an octopus. Then connect the manifold with the boiler through probably 22mm pipes.

 

[Joedeath332]

Once installed and running, do you need access to the manifold, apart from if you had an issue?

 

[picasso]

Yes you would need 18 pipes for 9 rads but at least you wont be digging your floors up in a few years time looking for leaks easier maintenance, better balancing and better control, you don't need access to the manifold unless you have a problem but as all joints are above the floor sorting problems is not a drama.

 

[Joedeath332]

What sort of manifold would i require for 9 radiators

 

[picasso]

This is the expensive way of doing it...
https://www.tradingdepot.co.uk/poly...81802392529727&utm_content=Manifolds & Access.

and this is the cheap way of doing it

x18

 

[Joedeath332]

This is the expensive way of doing it...
https://www.tradingdepot.co.uk/polypipe-pb12744-9-port-15mm-brass-under-floor-manifold?msclkid=677656f922f91e07c9340c3c03fc22da&utm_source=bing&utm_medium=cpc&utm_campaign=Polypipe - Shopping&utm_term=4581802392529727&utm_content=Manifolds & Access.

and this is the cheap way of doing it

View attachment 139633

x18

Thanks , i think i would go the proper manifold way , would i mount that above ground then have all the pipes ( i take it that would be 18 for 9 rads ? ) just come out of the concrete floor and have them connect directly to the manifold.
Also if i did go down the plastic pipe route instead of the copper pipe route ( both buried in concrete ) do you just clip the plastic pipe then concrete over it or do you sleeve it inside a pipe of larger diameter ?
Also what about insulating the plastic pipe while it is under the concrete.
and if i did go down the plastic pipe route instead of the copper pipe route ( both buried in concrete ) do you just clip the plastic pipe then concrete over it or do you sleeve it inside a pipe of larger diameter

 

[picasso]

Just laid on concrete and screeded over.
https://underfloorparts.co.uk/produ...ion/?msclkid=721910528ac810e0d2284a973498c6e3

 

[Joedeath332]

Thanks is there no need for insulation then.
Edit : just read the product description seems this is like an insulator as well

 

[Joedeath332]

Just laid on concrete and screeded over.
https://underfloorparts.co.uk/produ...ion/?msclkid=721910528ac810e0d2284a973498c6e3

Or could I get a larger diameter conduit so that I could place say for example 4 x 15mm pipes together inside the one conduit?

 

[Joedeath332]

OK the more I think about it the more I am leaning towards a plastic pipe installation,
So my cupboard where I am going to install my combi boiler is around 2 meters in height and I am wanting to have the manifold mounted as close to the floor as possible below the boiler, would this be OK?
Or is the distance to short between boiler and manifold for the 22mm pipe