A manufacturer may recommend periodic sediment draining or flushing, often annually, but the correct interval depends on the model, water quality, age and maintenance history. An older unit that has never been serviced may need extra caution, and flushing alone will not fix a failing tank or heating element. Check the manual or have a plumber assess the heater before opening a drain valve.
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For more context about this type of plumbing issue, read our related Oklahoma City guide.
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