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How to Flush a Water Heater Step by Step — Scarborough DIY Guide
Flushing your water heater annually removes sediment buildup (critical in Scarborough and Durham Region’s hard water areas) and extends tank life by 2–5 years.
Water Heater Flush — Step-by-Step Instructions
- Turn off gas valve or electric breaker to the water heater. Allow tank to cool 30–60 minutes.
- Turn off cold water supply valve at the top of the water heater.
- Open a hot tap in the house (kitchen or bathroom) and leave it open during the flush to allow air in.
- Attach a garden hose to the drain valve at the bottom of the tank. Route hose outdoors or to a floor drain.
- Open the drain valve — water drains. If the valve is old, it may leak slightly afterward; have a replacement ready.
- Once drained, turn on the cold supply briefly to flush remaining sediment.
- Close drain valve, refill tank (wait until water flows steadily from the open hot tap before turning heater back on).
- Restore gas/power once tank is fully refilled.
Note: If the tank has not been flushed in 5+ years, the drain valve may be seized or heavily corroded. Call a professional rather than force it.
How do you flush a water heater in Ontario?
To flush a water heater: turn off gas or breaker, turn off cold supply, open a hot tap, attach hose to drain valve, drain tank, flush with cold water, close valve, refill, restore power. Flush annually in Scarborough and Durham Region due to hard water sediment buildup. Call Madina Mechanical at (416) 424-4328 if the drain valve is seized or you need professional water heater maintenance.
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Water Heater Service Scarborough: (416) 424-4328
