Hot water is a part of everyday life, showers, washing up, laundry but have you ever stopped to think about the temperature of the water coming from your taps? Too hot and it’s a safety risk. Too cold and it won’t clean properly or feel comfortable.
In Australia, there are clear guidelines around hot water temperature for both safety and efficiency. Here’s what you need to know.
The Ideal Hot Water Temperature
The standard temperature for stored hot water in Australian homes is 60°C. This temperature is high enough to prevent bacteria like Legionella from growing inside your tank, which is especially important in systems that store water for long periods (like electric or solar hot water systems).
However, when that water reaches your bathroom taps and shower, it should be delivered at no more than 50°C and even lower (around 45°C) for childcare centres and aged care settings.
Why Stored Water Needs to Be Hotter
You might be wondering if 50°C is safer at the tap, why not just set the whole system to that? The reason is bacteria.
Legionella bacteria, which can cause Legionnaires’ disease, thrives in warm, stagnant water. The risk increases when water is stored below 60°C. That’s why your hot water heater should heat the water to at least 60°C but with a tempering valve fitted to reduce the water temperature before it reaches your outlets.
What’s a Tempering Valve?
A tempering valve blends hot and cold water to make sure the water at your taps is delivered at a safe temperature (usually 50°C). It’s now a legal requirement in most Australian homes for all new builds and water heater replacements. If you don’t have one, or your home is older, it’s worth checking with a plumber to see if one should be installed.
Can I Adjust the Temperature Myself?
Most electric systems allow you to set or adjust the thermostat, but that doesn’t mean you should. Changing your hot water temperature without proper knowledge can be unsafe and may void your warranty or go against plumbing codes.
If your water is too hot or not hot enough, the best option is to get it checked by a licensed professional who can safely adjust the system or install a tempering valve if needed.
Energy Efficiency vs Comfort
Some people try to reduce their water heater temperature to save on power bills. While the idea makes sense, anything below 60°C for storage tanks puts your household at risk of bacterial growth. The better way to save energy is by insulating pipes, scheduling regular maintenance, and upgrading to a more efficient system, like a heat pump or continuous flow gas system.
Signs Your Hot Water Temperature May Be Off
- Water feels dangerously hot or scalds quickly
- Inconsistent temperature from taps or showers
- Visible steam from hot water at low flow
- Kids or elderly household members at risk of burns
- Showers feel cold too quickly, or not hot enough
If any of this sound familiar, it might be time to have your system checked.
Need Help Getting the Temperature Right?
If you’re unsure whether your hot water system is running at the right temperature — or you’d like advice about installing a tempering valve — speak to a licensed professional.
For homes across Maitland and surrounding areas, Hogan Hot Water Maitland provides servicing, system checks, tempering valve installations and honest advice on how to keep your water safe and comfortable
Call us on 02 4934 4311 if you need help adjusting the temperature of your hot water system.
Note: Always ensure safety when inspecting or attempting to repair your water heater. If in doubt, seek professional assistance.