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
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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