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PostPosted: Sat Mar 04, 2017 1:52 am 
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hi ive just moved to a new house (to us) built in early 80s it currently has a microbore system with both pipes going to the same side on the rads.

im a sparky and am very hands on and would like ro replace the heating as we plan on being here until we retire, the whole house is a renovation project and the rewire starts next week.

i plan on removing the boiler and tank as i need the space in the kitchen and where the tank is will be stairs to the loft, do i plan to fit a combi in the loft.

my thoughts were to run 22mm plastic pipe from the boiler round the 1st floor outer edge of the building and T up and down in plastic microbore (1 rad per T off the 22mm) i could even use 15mm upstairs

my thoughts on the microbore for the downstairs is i want it flush with no boxing in and some rads seem awkward to get to and i also like that the pipework is hidden, i have read there can be problems with this but it seems ok what we have now,

should it be 22mm for the hot and cold water also then down to 15?

many thanks yes im a novice but im trying to do as much as i can on my small budget


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PostPosted: Sat Mar 04, 2017 8:05 am 
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You need at least 1m of copper pipe off the boiler flow and returns, but personally I would run copper from the boiler and change to plastic under the floor for looks, if you are insistent on using plastic.

Use 10mm plastic chased into the downstairs walls, but put it inside its own plastic conduit. Don't have any joints in the walls.

Or you could just run the 22mm to a well placed manifold then run 10mm from the manifold to each rad, with no joins between the manifold and the rad pipes until they exit the walls.

Stick to 15mm for the hot and colds if using a combi. 22mm if using an unvented cylinder, unless you have several bathrooms etc, then I would suggest using 28mm.

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PostPosted: Sat Mar 04, 2017 7:36 pm 
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thanks for your help, i plan to put the combi in the loft and come down in a wardrobe.

ill put the downstairs pipe in some sheathing, thanks for the tip and not join it

should i still do the upstairs in 15mm or 10mm?

below is my floorplan and the red shows the current rads and the blue is where the boiler will be in the loft, could someone in the know mark out my 22mm run and manifolds possibly,

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PostPosted: Sun Mar 05, 2017 4:26 pm 
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Personally I would do the upstairs in 10mm as well. It will help to balance the system.

Bring the 10mm pipes up in the wall from the floor behind each radiator.

But in the ned it is down to you.

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PostPosted: Sun Mar 05, 2017 7:12 pm 
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ok thankyou for you help, im trying to work out the manifolds so they are close to the drops as possible and i can only find 4 branch manifolds so dont want the 10mm runs to be too far away from the 22 mm


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PostPosted: Mon Mar 06, 2017 6:53 pm 
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Still better in 15 mm copper!

Tony



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PostPosted: Mon Mar 06, 2017 7:13 pm 
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Agile wrote:
Still better in 15 mm copper!

Tony


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SN :occasion5:


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PostPosted: Tue Mar 07, 2017 12:05 am 
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for flow and blockages? will it matter with all the joints inside the wall?


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PostPosted: Tue Mar 07, 2017 12:17 am 
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No joints in the wall whatever you use


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