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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...