A few reasons, already covered
1 being under pressure forces air out of the system when filling
2 being under pressure keeps air out of the system
3 being under pressure raises the boiling point of water (water boils at 100°c at 1 bar)
4 most boilers use a pressure switch to prove water in the system
1-1.5 bar is used as it is ideal for most family homes as most are 2 to 3 story and keeps prices down
It is the buildings height that governs the amount of pressure you need
we look after some systems pressurised to 5 or 6 bar
Matt
1 being under pressure forces air out of the system when filling
2 being under pressure keeps air out of the system
3 being under pressure raises the boiling point of water (water boils at 100°c at 1 bar)
4 most boilers use a pressure switch to prove water in the system
1-1.5 bar is used as it is ideal for most family homes as most are 2 to 3 story and keeps prices down
It is the buildings height that governs the amount of pressure you need
we look after some systems pressurised to 5 or 6 bar
Matt