When Would You Need to Drain Your Cylinder?
- Before replacement or removal
- To flush sediment from the tank
- During an extended period away (to save power)
- If the cylinder is leaking and needs to be depressurised safely
- As part of anode rod maintenance
Step-by-Step Draining Process
- Turn off power: Switch off at the switchboard (HWC circuit)
- Turn off cold water supply: Close the isolation valve on the cold water inlet pipe
- Connect drain hose: Find the drain valve at the cylinder base and attach a garden hose
- Route hose to drain: Run outside to a drain, garden, or appropriate outlet
- Open a hot tap indoors: This allows air to enter the system, letting water flow out
- Open drain valve: Turn anticlockwise to open and allow the cylinder to drain
- Close and reconnect: Once drained, close the drain valve, remove the hose, restore water supply, then restore power once the cylinder has refilled
Should I Do This Myself?
Draining a cylinder is one of the few hot water tasks a homeowner can safely do. However, water in an electric cylinder that hasn't been powered off can be very hot — take care. If you're unsure, call a plumber. We offer free advice over the phone for Christchurch homeowners.