How often should a water heater be serviced?

Once a year is a common interval for inspection and flushing, and manufacturers usually specify their own schedule in the manual. Homes with hard water often benefit from more frequent flushing.

Checklists

A practical plumbing maintenance checklist

What to check monthly, seasonally and yearly to catch plumbing problems while they are still small, plus the jobs that belong to a professional.

By Elijah Canfield, Founder, Hire Best Pros · Updated August 26, 2026

Elijah Canfield is the founder of Hire Best Pros. He writes and edits the site's consumer guides, with a focus on how home service and moving projects are priced, scoped and compared.

A plumber repairing a supply line under a kitchen sink

Most plumbing maintenance is observation rather than work. Once a month, look under sinks and at visible connections. Each season, test shutoff valves, drain a little water from the heater and check outdoor spigots. Once a year, have anything you cannot inspect yourself looked at: the water heater, the main line and any fixture that has been behaving oddly.

Monthly

Open the cabinet under each sink and look and feel for damp spots
Check around the base of every toilet for movement or moisture
Run water in rarely used fixtures so traps do not dry out and let odors in
Listen for a toilet that refills on its own

Each season

Exercise the main shutoff and fixture stops so they do not seize
Check the water heater area for corrosion, moisture or scale
Clean aerators and shower heads if flow has dropped
Before the first freeze, disconnect hoses and protect exterior spigots
After the last freeze, check outdoor spigots for a split that only shows under pressure

Once a year, or when something changes

Some checks need a professional because they need equipment or access you do not have. A yearly service visit is the cheapest way to convert an unknown into a known.

Water heater inspection, including the anode rod and pressure relief valve
Main line camera inspection on older homes or any house with a history of backups
Water pressure test if fixtures are loud or pressure feels high
Repair of anything you have been ignoring since last year

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Habits that prevent most service calls

Keep grease and coffee grounds out of the kitchen drain
Use hair catchers in showers and tubs
Skip chemical drain cleaner, which can damage older pipes and rarely fixes the cause
Do not flush wipes, even the ones labeled flushable

Common questions

How often should a water heater be serviced?: Once a year is a common interval for inspection and flushing, and manufacturers usually specify their own schedule in the manual. Homes with hard water often benefit from more frequent flushing.