Coronavirus (COVID-19) update: We are currently updating information following recent Queensland and Australian Government announcements. Find assistance and support for coronavirus affected businesses and industries.

Hot water systems and sustainable buildings

Tempering valves

In hot water storage systems for residential buildings, hot water must be heated to a minimum of 60° Celsius to prevent the growth of bacteria such as Legionella.

A tempering device ensures that the hot water is delivered to taps at a maximum of 50° Celsius. This temperature is sufficient for domestic hygiene purposes and effectively reduces the risk of scalding-related injuries from hot water.

A tempering device must be fitted to all new and replacement hot water systems. They can be identified by a blue, green, orange (solar systems) or black plastic cap fitted as part of the system's piping.

Solar and heat pump endorsement

Solar hot water and heat pump hot water systems must be installed by a hot water installer with a solar and heat pump endorsement from the Queensland Building and Construction Commission (QBCC).

Related resources


Coronavirus (COVID-19) business support: 1300 654 687

General enquiries: 13 QGOV (13 74 68)