Can a Leaking Hot Water Cylinder Be Repaired?

Types of Hot Water Cylinder Leaks

• Fitting or connection leak: From inlet/outlet pipes or fittings — repairable, $80–$250.
• Pressure relief valve dripping: New valve needed — $150–$300. Could indicate high system pressure.
• Cold water inlet or expansion valve: Repairable — $120–$280.
• Tank body leak: Water directly from the cylinder wall or base — cannot be repaired. Replace immediately.

How Urgent Is a Tank Body Leak?

Very urgent. A leaking tank will fail completely — often suddenly — releasing 150–300L of near-boiling water. This can cause serious scalding and extensive property damage. If water is coming directly from the cylinder body, turn off the water supply to the cylinder and call a plumber immediately.

How to Shut Off Your Hot Water in an Emergency

1. Find the cold water isolation valve on the pipe entering the cylinder
2. Turn it clockwise to shut off water supply to the cylinder
3. Turn off cylinder electricity at the switchboard (or gas supply)
4. Call a plumber — same-day emergency service available across Christchurch