Central Heating Sealed System Basics
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| Sealed System
(recommended) Instead of using a tank and an expansion
pipe, sealed systems use an “Expansion Vessel”, a “Safety Blow Off
Valve” and a “Filling Loop”. Most modern systems use this method
because it is easier to install and has less tendency of problems
developing in the system at a later date. A lot of manufactures
include an expansion vessel, pressure gauge and Safety Valve in the
boiler case (System Boiler), but all the components can be obtained
separately. Most boilers will work on a sealed system. Note. Not all
boilers can be fitted to a sealed system. (consult the boiler
manufacture’s instructions)
These systems should be pressurised at 1 Bar pressure when cold,
if not some or all of the system will not work.
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