What is a pressurized central heating system and what are the benefits?
A pressurized system uses an expansion vessel, containing a diaphragm and a compressible gas (typically air or nitrogen). The expansion in the water as it is heated is accommodated by the nitrogen being compressed. The main benefits are the lack of a requirement for a ‘filling and expansion’ tank in the loft, and improved efficiency. An added benefit with a sealed radiator system is that a leak from a radiator while you are away from the property can only lose a finite amount of water. A conventional radiator system fed from a tank will continue to refill indefinitely.
