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Mend Glow-worm 92/100b Sealed Glow Worm

what is the difference between sealed and unsealed systems?

I am needing to replace my old Glow worm 92/100b floor standing boiler with a wall mounted similar size boiler. how do i determine if it is a sealed or unsealed system

Mark Armstrong
January 2007
Glow-wormGlow-worm 92/100bD.I.Y, PlumbingSealed Glow Worm
a unsealed system has a small f/e tank in loft. fed by a ball valve from the mains water. a sealed system has an exspansion vessel (like a red foot ball) instead of a tank and the system is filled by a filling loop of the mains water to a certain pressure. this system is under pressure. unsealed is gravity pressure

hi-spec plumbing
January 2007

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Glow-worm 92/100b Boiler: Sealed vs Unsealed