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YES IT IS DEF a sealed system, it has a expansion vessel to rear of unit and prv just above pipe connectors on chasis if you look up from the bottom of it, but i will def check cold pressure in morning as im sure just after it fired up the other day it was low just in red on dail but came up...

Hello there hope you can help my boiler mainly in mornings keeps igniting then within say 40 secs to 90 secs drops out and relights and with a woof! it keeps doing this then if turn the boiler potentiometer down and click off and then back up it seems to sort it out for a while, boiler is a...