Maximum number of radiators on a 15mm primary circuit ?

Posted by Sam Peters, on Mon 25 Nov 2013 09:43pm

I have heard that it is three or four, and if it were more than this, (eight), what effect would it have?

Stephen Maginnis

Wed 27 Nov 2013 10:35pm

Hi Sam It would be most beneficial for the first part of the system to run in 22mm pipe then branch off in 15mm pipe work, as well it depends of your boiler capacity. Regards Steve

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James Fisher

Tue 26 Nov 2013 10:24am

Hi Sam, 15mm pipe is capable of delivering 6kw of heat. each room should have its heat calculation demand worked out then choose the radiator with the correct heat output. if your house needs say 10kw of heat and your entire central heating is piped in 15mm pipe then it will never reach full heat. basically it depends on the size of the room and the radiator as too how many radiators you can supply on 15mm. James

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