Age
Check the serial number on the label. Manufacturers encode the date. Many tanks last around a decade, depending on water quality and maintenance.
Warning signs
- Rusty or discoloured hot water
- Rumbling or popping noises
- Damp or rusty floor at the tank's foot
- Showers going cold sooner than before
- Temperature fluctuations
- Leaks from fittings or the relief valve
What to do
If the tank itself leaks, it must be replaced. Kill the gas or breaker, then the cold inlet. For other symptoms, a plumber can check whether parts or maintenance help.
Place a drain pan under heaters in finished spaces to catch slow leaks.
Help
See water heater repair and replacement.
Reading the serial number
Manufacturers use different codes, but often the first letters or numbers indicate the month and year. Searching the brand and serial format online usually explains it. Rented units can be dated by the rental provider.
Relief valve drips
The T&P valve releases water when pressure or temperature is too high. Occasional dripping may indicate thermal expansion in a closed system; an expansion tank helps. Constant leaking needs attention.
Planning replacement
Choose a replacement before the old one fails. Consider size, type, venting and whether to rent or buy. Our rent or buy guide discusses options.
When to put the tools down
Some of this is homeowner work and some is not. Stop and phone us if you see any of these:
- Showers going cold sooner than last winter
- Crackle and knock from sediment as it heats
- Brown tint on the hot side alone
- A puddle forming beneath the tank
- Anything involving the gas line, the venting or cutting into a wall
Quick answers
Can I keep using a leaking tank?
A tank that leaks from the body will only get worse. Shut it down and arrange replacement.