What does the PTR valve on my hot water unit do?

hot water units - Geelong, Torquay & Surf Coast, Barwon Heads, Ocean Grove & The Bellarine

Hot water services – repairs & replacements in Geelong, Torquay & the Surf Coast, The Bellarine and Melbourne

A PTR valve is a ‘pressure temperature relief’ valve.  It’s a safety device that is fitted to a hot water service and it releases water if the temperature or pressure becomes too high.

It also ensures that the temperature of the water in your hot water unit (which is pressurised and unvented)  does not exceed 99 degrees celcius, in the event that the normal thermostatic controls fail.   This is a requirement of Australian Standard AS3500-4.

It can be normal for your valve to drip a little at times, however, if it is dripping continually, or you notice the area around your hot water service is wet, your valve may need to be replaced by a plumber.


We can assist with all types of hot water heaters –  Rheem, Rinnai, Vulcan, Aquamax, Bosch & more.

This is an article from our Hot Water Systems series