Hot Water System Parts & Maintenance | Plumbing Tips
Your hot water system is one of the hardest-working appliances in your Melbourne home. Whether it’s a morning shower, dishwashing, or laundry, you rely on it every day. But when things go wrong, especially during a plumbing emergency. Do you know what to look for?
Knowing the main parts of your system can help you see early signs of trouble. This way, you can call a local plumber before a small issue turns into a big problem. Whether you’re a new homeowner or upgrading your unit, here’s a breakdown of how it all works and why maintenance matters.
1. DUO Valve – Controls Water Flow
The DUO valve is your system’s main isolation point. Found on the cold inlet pipe, it controls:
- Cold water entering the tank
- Hot water from flowing back into the home’s system
This valve is crucial during service or emergencies, as it lets your plumber quickly shut off the unit. If you suspect an issue with your hot water system, always start by locating the DUO valve.
2. Gas Isolation Valve – For Gas-Powered Units
For gas hot water systems, there’s a separate gas isolation valve, usually marked with a yellow handle.
- Shuts off the gas supply to the unit
- Necessary during maintenance or emergencies
- A must-know valve in case of a gas leak
If you smell gas near your unit or anywhere in your home, turn this valve off immediately and call an emergency plumber.
3. Tempering Valve – Keeps Tap Water Safe
This safety valve mixes hot water with cold before it reaches your taps.
- Regulates temperature to a safe maximum of 50°C
- Prevents scalding and burns, especially in bathrooms
- Mandatory in new or upgraded systems
If your tap water suddenly feels too cool or fluctuates in temperature, your tempering valve may be due for replacement.
4. PTR Valve – Pressure and Temperature Relief
The Pressure and Temperature Relief (PTR) valve is one of your system’s most important safety features.
- Releases excess pressure and heat
- Drips water during heating cycles (normal)
- Should not leak constantly
If you see heavy or persistent leaking, don’t delay, contact a licensed Melbourne plumber for a system check.
5. Storage Tank – The Heart of the System
This is where all the hot water magic happens. Inside the tank:
- Cold water enters from the base
- A heating element (gas or electric) warms it
- Hot water exits from the top when you turn on a tap
Over time, tanks can accumulate sediment and rust. Regular flushing and servicing by a local plumber keeps it running efficiently.
Maintenance Essentials – Keep Hot Water Flowing
Just like a car, your hot water system needs servicing to stay reliable and safe.
Annual Maintenance Includes:
- Visual inspection
- Testing the DUO and PTR valves
- Checking pipework and fittings for leaks
- Flushing sediment build-up
Every 5 Years:
- Replace sacrificial anode to prevent tank corrosion
- Full valve and pressure check
- Clean inside and outside the tank
- Assess electrical or gas components
Call Jet Plus Plumbing – Your Local Hot Water Experts
Our licensed plumbers can service, repair, or replace any type of hot water system—gas, electric, or solar. We also offer:
- Emergency callouts
- Gas leak detection and repair
- System upgrades and replacements
- New installations for renovations or extensions
Whether you’re in Dandenong, Cranbourne, or across South-East Melbourne, Jet Plus Plumbing is ready to help. Our hot water services are fast, reliable, and backed by real experience.
Stay Safe, Stay Warm – Book Your Hot Water Service Today
Don’t wait for your hot water to go cold or your system to fail. With regular checks and expert support, you’ll enjoy:
- Longer-lasting equipment
- Lower utility bills
- Peace of mind
Call Jet Plus Plumbing now at 0421 725 624 or book online to schedule a hot water system check.
Let Jet Plus Plumbing keep the hot water flowing all year round.
