Your hot water cylinder works away quietly in its cupboard — until it doesn't. Most Auckland homes have a storage cylinder, and they don't last forever. Here are five warning signs it might be time for a replacement.
Running Out of Hot Water Faster Than Usual
If you're getting shorter and shorter showers before the water goes cold — and your household hasn't grown — the cylinder may be losing its ability to heat and hold water efficiently. Sediment builds up at the bottom of the tank over time, reducing the effective capacity. Have it inspected before it gets worse.
Rusty or Discoloured Water
Brown or rusty water coming from your hot taps is a sign of internal corrosion. Every cylinder has an anode rod designed to attract corrosion and protect the tank walls — but once that rod deteriorates, the tank itself starts to rust from the inside. If you're seeing discoloured water, get it checked — it may be salvageable, or it may be time to replace.
Leaking Around the Base
Puddles or dampness around the bottom of your cylinder usually means the tank has corroded through. This is the most obvious sign it's done. Don't wait — water damage to your floors, walls, and framing costs far more than a new cylinder. Call a plumber immediately.
Your Cylinder Is Over 15 Years Old
Most hot water cylinders in New Zealand last between 15 and 20 years. If yours is approaching that age or you don't know when it was installed, check the manufacturer's plate on the cylinder for a date. Planning ahead means you can choose the best replacement on your terms — not in a panic when it fails on a Sunday night.
Rising Power Bills
An aging cylinder loses efficiency as insulation degrades, elements wear out, and sediment builds up. If your power bill has been creeping up and nothing else has changed, your hot water system could be the culprit. Modern cylinders are better insulated and more efficient, and a continuous flow system eliminates standby losses altogether.
Replacement Options
Read our full comparison: Hot Water Cylinder vs Continuous Flow