Capping off 10mm microbore, replacing large rad with 2 smaller in 15mm advice pls

Tirglas_7 · 5 Oct 2019

Hi,

The bottom of my house is a semi basement where we keep the washing machine etc. In the stairwell there's a large 1500 x 600 double panel rad, supplied by 10mm microbore.
When the heatings on it just about gets warm, never hot.

IMG_20191005_133747

Tirglas_7
5 Oct 2019

IMG_20191005_133727

Tirglas_7
5 Oct 2019

We've also rejigged the area around, the stairwell and added a stud wall to create another small room down there. So what with the radiator not getting hot plus the room it was specced for is now half the size I want to install a smaller rad down there, then install a another rad in the room behind the stud wall.

I also have access to 15mm ch pipework in the adjoining room.

IMG_20191005_133952

Tirglas_7
5 Oct 2019

Can I cut and cap off the 10mm microbore at the ceiling? Or can I just join them together? then remove the large rad.

Then T off the existing 15mm (pictured) and run 15mm to the x2 smaller rads from there?

terryplumb · 5 Oct 2019

No don't join together ,or cap. Extend the microbore to one rad. T into the flow and return pipes to supply second rad.

Tirglas_7 · 5 Oct 2019

Hi, many thanks for the reply

The original rad on the 10mm does not get hot, if I tee off that won't it make it even worse?

Reason I wanted to cone off the 15mm as all the rads running off that are piping hot.

denso13 · 5 Oct 2019

Tirglas_7 said:
Then T off the existing 15mm (pictured) and run 15mm to the x2 smaller rads from there?

I'd go with that, sounds good.

Tirglas_7 · 5 Oct 2019

Great cheers

What's best to do with the 10mm microbore?
Cap each pipe off as close to the ceiling as possible?

Thanks again

denso13 · 5 Oct 2019

As close to the tee's or manifolds where they originate if possible. But close to the ceiling would be a good second best.

terryplumb · 5 Oct 2019

Is the system pressurised or fed from an f&e tank ? Its not a particularly good idea to have two " dead legs".
The 15 mm pipes currently supply how many radiators ,and what size ?

Tirglas_7 · 5 Oct 2019

It's going to leave around 6 inches of 10mm dead leg, I know where the tee is as I saw them whilst replacing the floorboards, it would require either ripping out the ceiling or raising floorboards, neither of which is viable now
really.

It's a wb combi boiler, so no tanks etc.
22mm comes off the boiler and runs under the house in a void. The 10mm comes off and supplies x3 rads including the one I want to remove. The rest of the house is on 15mm which is 7 rads.

Thanks again for the replies

terryplumb · 5 Oct 2019

Well 6 inch dead legs are no problem.
So run with your original plan

Tirglas_7 · 5 Oct 2019

Great, thanks again

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Capping off 10mm microbore, replacing large rad with 2 smaller in 15mm advice pls

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