The tempering valve is used to regulate the set temperature of mixed hot and cold water even when variations occur in the water
supply conditions. In the event of a failure of the hot or cold supply, the piston will shut off, stopping water discharging from the
mixed water outlet.

Caleffi tempering valves are compact in design with superior performance.
The 5213 series grey cap tempering valve is suitable for storage hot water
units. The Caleffi 2522HP series yellow cap tempering valve has been
specifically designed for installation in solar hot water systems, as well as
being suitable for use on instantaneous systems where supply conditions
may fluctuate.

The 5213 series is now available in 25mm and features exceptional flow
rates, as well as being able to temper the water down to 20ºC which is
particularly suited to emergency shower applications.