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Thanks slippyr4 Two separate runs from four separate 'T's was always my intention and thank you for the clarification. Would there be any benefit of running the horizontal portion of the extension in 22mm (9m) and the drops to the rad in 15mm (2.4m)?

Hi All, I detect a bit of animosity here. Excuse me for asking but with regards to my original query is it okay or not? I'd appreciate a layman's answer if possible. IIChopperII

Thanks for the reply's and sorry for the wrong use of terminology. The system is a conventional one with a 22mm flow and return with the 15mm flow and returns 'T'd off this. I've attached a diagram of current and proposed set up. I think the boiler is a Feroli domicompact F30 B (making it a...

Hi, I'm wanting to add 2*1783 watt (6084 BTU) radiators to my existing central heating system. Assuming that the boiler is large enough to accommodate the addition is there a maximum length of 15 mm pipe that can be run from the 22mm ring? I am planning two individual flow and returns as I...

I have a combi boiler in the downstairs cloak room heats the rad in that room and the first two rads on the 15mm ring upstairs (approx 4&5m from the boiler). The next rad (approx 9m from boiler) Fed from the upstairs ring but down stairs doesn't get any heat. Neither the next (approx 8m from...