Troubleshooting an Electric Hot Water Heater With No Hot Water.

Hot Water Heaters are among the most hardy appliances built, they are long lasting and usually need replacing around 15-20 years depending on whether it is installed internally or externally.

Never attempt to do you own plumbing or electrical work, it is not only illegal in Australia but dangerous.

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No Hot Water
Is There Electricity to the Heater?

The most common cause of no hot water is the switch tripping, someone turning it off or a blown fuse. Check your fuse or switch in the switchboard it’s usually marked by “Hot Water”, “Water Heater” or “H/W”. If your switch is off, get a licensed Electrician to test the circuit to make sure there isn’t a fault which could be potentially dangerous. Faulty wiring can lead to fires.

heating device
Element heats up your tank

A tripped switch can also be a sign of a water leak in or around your hot water heating element or thermostat. In this case you need to call a licensed Electrician to replace the element or thermostat.

Does your Heater have a timer?

If your Hot Water System has a timer, check the setting allows enough time for the heater to reheat itself.

Not Enough Hot Water Faulty Tempering Valve

Tempering valve mixes hot and cold water to 50 degrees

Not enough hot water can be caused by a faulty tempering valve which is allowing more cold through the line than hot. Pieces of debris can get caught in the valve stopping it from opening up fully to allow water through. You need to call a licensed Plumber to flush or replace this valve.

Faulty Thermostat

A thermostat may also be at fault if you don’t have enough hot water, faulty thermostats don’t allow enough electricity through to the element to heat the water leaving you with a luke warm tank. This is highly dangerous and can lead to a breeding ground for bacteria and legionella. Call a licensed Electrician to replace the thermostat.

Hot Water Supply

Make sure your hot water heater has enough capacity for the number of people it is servicing. As a general rule, on-peak hot water systems supply:

  • 125 litre 2-3 people
  • 160 litre 2-4 people
  • 250 litre 3-5 people
  • 315 litre 4-6 people
  • 400 litre 5-9 people

Off-peak hot water systems supply:

  • 125 litre (not to be used off-peak)
  • 160 litre (not to be used off-peak)
  • 250 litre 1-3 people
  • 315 litre 3-4 people
  • 400 litre 4-7 people

Are You Using More Hot Water Than You’re Aware Of?

  • Keep an eye on the length of time spent in the shower.
  • Install a water saving shower head in your bathroom.
  • Use cold water to wash clothes.
  • Install a cold water heating dishwasher.

Is Your Temperature Pressure Relief Valve (TPR Valve) Leaking?

Pressure release valve

It’s normal for your TPR Valve to discharge small amounts of water occasionally during the heating cycle and cold water expands when it is heated. If your TPR Valve is leaking more than a cup of water over 24 hours call a licensed Plumber to check the valve.