microbore and rad size

[dazzmos]

just a little question is it ok to use 8 mm microbore on a 300mm x 1200mm double rad? about 5000btu
if not 8 then 10mm
many thanks in advance

 

[Bahco]

10 mm will give you more flow than 8 obviously but 15mm would be my choice to avoid possible problems with slow heating up.

 

[dazzmos]

it would be great to use 10 mm so i can put it in trunking ??

 

[Bahco]

Will probably heat up ok so try it.

You can always change to 15mm.

Its difficult to advise without seeing how your system is configured.

 

[gas4you]

In theory 8mm will be fine, 10mm is the normal standard today, this is ok up to around 10,000 btu

 

[John M]

I gots 2000 X 600 rads in my lounge & dining rooms ..... Both fed by 8mm ..... They work fine No they wern't both sharing the same 8mm pipe

From cold to hot water arriving @ the rads ..... Bout 90secs, from cold to too hot to touch 5mins ......... From cold to room stat knocking the boiler off all external voids closed 12Mins

Well that was all fine till the system took a dump ....... But it ran that way for 30 years