What Are the Signs My Hot Water Cylinder Needs Replacing?

The 7 Warning Signs

1. Rust-coloured or discoloured hot water: Orange/brown tints indicate internal tank corrosion — serious, don't ignore it.
2. Water around the base: Pooling under the cylinder means tank leak or failing fitting.
3. Rumbling, popping or banging noises: Sediment on the element reducing efficiency.
4. Inconsistent water temperature: Hot water running cold quickly or varying through a shower.
5. Pressure relief valve dripping constantly: Suggests a fault requiring inspection.
6. Age over 12 years: Even a healthy-looking cylinder may be corroding internally.
7. Higher power bills: Ageing cylinders work harder and cost more to run.

Is a Dripping Pressure Relief Valve Serious?

Yes. The T&P valve is a safety device. Constant dripping means it's faulty or system pressure is too high. Never block or cap it — this is dangerous and illegal. Have it inspected urgently.

What to Do When You Spot These Signs

Call a licensed plumber for an assessment. Many Christchurch plumbers will inspect your system and give honest advice on repair vs replace. Don't wait until a small sign becomes a burst cylinder and a water damage bill.