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House hard to heat?
Suffer from Mould, Mildew or bad condensation?
Suffer from Rust, Corrosion?
for all your DIY needs!
Hints and Tips
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.

expansion vessel

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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