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Changing my HW Cylinder and the photo shows the existing connection type for all 4 connections. Our local supplier doesn't know what type of connection these are. They appear to be tapered slightly after the shoulder and i'm pretty sure the thread is 1". Fitted by British Gas about 20 years...

Hello all, sorry if this is a bit long but here goes......... My son and his girlfriend have recently moved into a house built in 1999 with a Suprima 30 installed as it's CH Boiler. When power is applied to the unit (from a switched fused spur) the Green & Red LED's light up for a short time...