You can tell if your hot water system is gas or electric by looking for a gas pipe connection (copper or steel pipe) or a flue pipe (exhaust vent). Electric cylinders have no flue. You can also check your switchboard for a dedicated 'HWC' or 'Hot Water' circuit breaker.
| Feature | Electric | Gas |
|---|---|---|
| Flue pipe | None | Yes — metal pipe through wall |
| Gas pipe connection | None | Yes — copper or steel pipe |
| Switchboard circuit | 20–30A 'HWC' breaker | Small circuit for ignition only |
Your switchboard should have a circuit breaker labelled 'HWC' or 'Hot Water.' A large amperage breaker (20A or 30A) indicates an electric cylinder. A high overnight usage band on your power bill also suggests electric hot water on a controlled load (night rate) tariff.
Knowing your system type helps when getting quotes, planning upgrades, or troubleshooting faults. It also determines whether you need a licensed electrician, gasfitter, or general plumber for any work.