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| Sealed Type Central Heating System |
Sealed Systems incorporate an 'expansion vessel', which replaces the feed and expansion cistern, having a diaphragm within it to accommodate system expansion which occurs as the water increases in temperature.
As this type of system is not open to atmosphere, there is little possibility of oxygen being absorbed into the water and therefore a reduced risk of corrosion occurring within the system.
These systems require additional safety controls (often incorporated into the boiler) since there is no open vent, nor a permanent connection to a water supply.
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