What is a safety tray and termination device and why have we quoted it ?
It seems like you’re concerned about proper installation and safety standards for hot water tanks in Australia.
It’s essential to follow the Australian Standards to ensure the safe and reliable operation of these systems and to prevent potential damage and costly repairs..
Installing a steel safety drip tray under hot water tanks in indoor locations without a floor drain is indeed a requirement outlined by the Australian Standards. .
This tray serves as a safeguard to catch any leaks from the tank or connections. To make the safety system effective, it’s necessary to have either a 25mm drain or an approved automatic shut-off valve in place. The Mildred Automatic Shut Off Valve, which you recommend, is an example of such a safety device. The valve functions by instantly stopping the water flow if it detects a leak, thereby preventing any potential damage and the need for expensive repairs. The fact that it operates on 4 AAA batteries, which need to be replaced yearly, makes it a relatively low-maintenance safety device. The audible alert when the batteries require replacement adds an additional layer of assurance..
In situations where other plumbers aren’t quoting the same safety measures, it could indeed be a matter of concern. It’s essential to ensure that any professional hired for such installations complies with the relevant safety standards and best practices to protect both your property and your daily use of hot water.
These excerpts are taken directly from: AS/NZS 3500 Plumbing and drainage Part 4: Heated water services
5.4 Protection Against Damage From Leaking Water
5.4.1 Concealed water storage tanks
All water containers, cold water storage tanks, cold water storage tank-fed water heaters or storage water heaters that are installed in roof spaces, in cupboards or otherwise concealed shall be placed on safe trays complying with Clause 5.4.3. The safe trays shall be drained by safe wastes complying with Clause 5.4.4.
Notwithstanding the above requirements, mains pressure water heaters may be installed on a safe tray without a safe waste, provided a leak protection device is fitted adjacent to the cold water inlet and upstream of any expansion control valve.
5.4.2 Unconcealed water storage tanks
Unconcealed water storage tanks, installed inside buildings on or above a floor surface that is impervious to water and suitably drained to a trapped or untrapped floor drain or an external doorway, do not require safe trays. A mains pressure water heater with a leak protection device fitted adjacent to the cold water inlet and upstream of any expansion control valve does not require a safe waste.
All other unconcealed water storage tanks that are installed inside buildings shall be installed with safe trays complying with Clause 5.4.3 and safe wastes complying with Clause 5.4.4.
NOTE: Free outlet-type storage water heaters, not exceeding 13.5 L capacity, and instantaneous water heaters do not require safe trays.