Why is My Hot Water System Leaking?

It might be baffling to not know the exact cause of a water heater leak in your household or workplace. If you suspect a hot water system leak, you should contact Doherty Plumbing Solutions for assistance!

Leaving it until late could cause long-term damage to the unit itself, and even harm adjacent walls and flooring if the leaking water begins to accumulate. Slow leaks, which are not always promptly detected, can further cause irregular water flow from the hot water system.

So, before things snowball into a bigger plumbing issue, it is always advisable to act fast.

While some hot water unit leaks can be tackled with minor repairs, others might require a hot water heater replacement. In this case, licensed plumbing professionals such as Doherty Plumbing Solutions are there to help you find the best option.

What causes water heaters to leak?

Irrespective of any make or model of a hot water system, leaks springing from the unit could be due to one or more of the following causes:

  • Corrosion inside the tank resulting from the old age/overuse of a heater
  • Ill-fitting pipework, which might leave the unit’s supply lines loose
  • Damaged valves, including the pressure and temperature release valve (PTV) and expansion control valve (ECV), which help to keep the unit functioning optimally
  • Higher water pressure in the water mains, compared to the capacity of the heating unit

What to do if you notice a water heater leak?

If you find hints of a hot water system leak, take the following steps:

  1. Try to locate the source of the water leak.
  2. Turn off the water supply to the heating unit from the mains.
  3. Contact a professional plumber for peace of mind, and to gauge if you need a simple water heater repair or a full overhaul of the unit.

Who fixes hot water systems in Melbourne?

When your hot water system starts to act up, and you are frustrated by the sudden inconvenience, Doherty Plumbing Solutions’ team of expert plumbers can help.

Our licensed plumbers provide complete hot water services in Melbourne’s eastern suburbs, including repairs, maintenance and replacements/installations.

When you choose Doherty Plumbing Solutions for your Melbourne hot water services, you will receive top-of-the-line, quality workmanship.

In the event a hot water unit repair is not possible, we will work with you to determine a replacement that is suited to your home, budget, family, and lifestyle.

We work with industry-leading Australian brands for hot water units, and can make the necessary arrangements to order and install it in your Melbourne home or business.

For regular and reliable servicing of your gas appliances in compliance with the current Australian safety standards, reach out to our team for a quick response:

Request a Call Back

Please include any relevant images you may have of work required.
Drop files here or
Accepted file types: jpg, jpeg, png, Max. file size: 4 MB, Max. files: 3.
    This field is for validation purposes and should be left unchanged.

    Always reliable and responsive we have used them on multiple tasks.Matt installed a modem toilet onto a vintage drain without difficulty. I have recommended them to my friends
    John Moore Avatar
    John Moore
    7/13/2024
    Very quick response, great communication throughout and George was exceptionally courteous and helpful in finding a solution to my roof leak problem.
    Mandy Purcell Avatar
    Mandy Purcell
    9/25/2025
    The team at Doherty Plumbing provided exceptional services at very short notice to fix my hot water system. Their quote was very fair and honest quote where other plumbers were charging extortionate amounts for the same problem. They were able to fix the issue within the day and communicated very well. I highly recommend their services.
    Laura Avatar
    Laura
    11/06/2025
    I had a great experience with the team at DP when they promptly addressed my hot water piping issue. George worked efficiently, and he was friendly and professional throughout the visit. He did a thorough job and took the time to ensure everything was done correctly. I would definitely recommend their services and would not hesitate to call them again.
    Susan Lim Avatar
    Susan Lim
    12/16/2025
    Great experience - notified me when they were coming and knew exactly how to fix a difficult problem in lightning time.
    The Crack Avatar
    The Crack
    4/23/2024
    I had an incredible experience with George from Doherty Plumbing. He was punctual, reliable and sorted out my leaking roof. Trustworthy and experienced. Would definitely recommend this small business if you are looking for excellent skills.
    Natalie King Avatar
    Natalie King
    11/03/2025
    Tim arrived on time and quickly and efficiently got to the work needed - snaking out a blocked storm outlet. All working now like it should and as I hoped. Great service from Doherty’s!
    Mark Coffey Avatar
    Mark Coffey
    8/12/2025
    Highly recommended 10/10. On time . Courteous guy , friendly and polite. In lead up to him arriving I was kept in the loop during the whole process. Cost I was amazed it was so reasonable. Being screwed in the past by tradesmen this plumbing service made me realise honest tradesmen are still around. Thanks. Guys.
    Gazza East Melbourne Avatar
    Gazza East Melbourne
    3/30/2024
    I have been dealing with Doherty Plumbing for some years and I find them to be professional, knowledgeable and prompt. Their costs are very competitive. They are quick and always fix the problem. They have been so competent and reliable, that I will always call them and never go anywhere else.
    Gillian Morgan Avatar
    Gillian Morgan
    2/06/2025
    Arrived at the scheduled time, completed the work professionally and in a timely manner, and to our complete satisfaction, as has always been the case in the past. Staff are always polite and skilled.
    Roger Wilson Avatar
    Roger Wilson
    10/13/2024
    For reliable plumbing services, call 03 9877 5775 or 0417 577 432