16
Issue 1 06/02/20
4
Description of Product
This product is a purpose designed unvented water heater. The
unit has a stainless steel inner vessel, which ensures an
excellent standard of corrosion resistance. The outer casing is
a combination of resilient thermoplastic mouldings and soft
jacket. All products are insulated with CFC free polyurethane
foam to give good heat loss protection.
This unit is certified and intended to be used in an unvented
system. The unvented system kit offered by Baxi Heating must
be purchased at the same time. If this kit isn’t purchased, it
could invalidate the warranty of the cylinder.
4 Description of Product
4.1 General Description
The unvented cylinder is used to heat and store hot water for
use in commercial applications.
To provide pressure to the tap or shower an unvented unit uses
the incoming mains water pressure. To do this the cylinder is
sealed and not vented. However, when the volume of water is
heated it expands and without any room for expansion could
cause the cylinder to rupture and fail. To allow expansion of this
heated water it is important that an expansion vessel is used.
This vessel is pressurised and gives the heated water room to
expand.
4.2 Operation Principle
