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how do i get more pressure on my boiler on hot circuit?

vailliant boiler mag 125/1a811 joh vailiant kg initial pressure good for 5 seconds then trickles out very slow is there an adjustment on unit to increase flow rate and heated water pressure any clues

mark
September 2009
Scaled Domestic Heat Exchanger by sounds of it, Job for a Registered Gas Engineer

www.elanar.co.uk
September 2009

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