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Thanks for the link but it is the boiler's minimum flow rate for central heating that I need. Without this, I cannot read off the valve's graph.

Hi, I have a Halstead Ace High boiler in a system that has an automatic bypass valve in the central heating circuit. I cannot find any info on the minimum flow rate for the heating circuit to deduce the setting of the valve. Anyone know this or can point me in the right direction? Many thanjs