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Discuss Greenstar Condensing Boiler 24 Ri big enough for job? in the Central Heating Forum area at PlumbersForums.net

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See how the cylinder has a small section at the top, that’s a cold water storage cistern, Known in industry as “fortic”. That’ll be your problem, check to see how quickly water is replenished as hot water is Drawn off.
 

EvilDrPorkChop

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See how the cylinder has a small section at the top, that’s a cold water storage cistern, Known in industry as “fortic”. That’ll be your problem, check to see how quickly water is replenished as hot water is Drawn off.
It’s not a combination cylinder it’s a thermal store. The tank is supplying the heating side of the system.

The strainer is probably blocked on the incoming main, where the expansion vessel is. It’s not clear if there’s a PRV on the incoming main on the photo but if there is I’d check that this is operating correctly too.
 
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It’s not a combination cylinder it’s a thermal store. The tank is supplying the heating side of the system.

The strainer is probably blocked on the incoming main, where the expansion vessel is. It’s not clear if there’s a PRV on the incoming main on the photo but if there is I’d check that this is operating correctly too.
here are a few more photos. Thank you for all the advice - it's much appreciated.
 

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ShaunCorbs

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