Water Heater Guide
A little routine maintenance is the cheapest way to avoid an expensive repair later. Here's exactly what to check, how often to check it, and which tasks are reasonable to handle yourself versus better left to a professional.
Why Maintenance Matters
A surprising number of the repair calls we get trace back to the same handful of causes: sediment that was never flushed out, an anode rod that was never replaced, or a relief valve that was never tested. None of these are complicated to prevent. They're just easy to forget about, since a water heater sits quietly in a basement or closet doing its job until, one day, it doesn't.
This checklist covers what actually needs attention, on what schedule, and which tasks are reasonable for a homeowner to handle versus which ones are worth having a professional do. If you're already seeing a warning sign rather than doing preventive maintenance, our signs your water heater needs repair guide covers that instead, and our water heater maintenance page covers what a professional service visit includes.
The Checklist
Six core tasks cover the vast majority of what keeps a water heater running reliably.
Draining the tank and flushing it clears out sediment that settles at the bottom over time. Left alone, that sediment insulates the water from the heating element or burner, forcing the unit to work harder, and it's the leading cause of the popping and rumbling noises homeowners notice. Homes with harder water may benefit from flushing every 6 to 9 months instead of annually.
The anode rod is a sacrificial metal rod designed to corrode instead of the tank itself. Once it's significantly depleted, the tank becomes the next thing exposed to corrosive minerals in the water. Checking it every couple of years, or sooner if you're already seeing rusty hot water, is one of the more effective ways to extend a tank's working life.
The temperature and pressure-relief valve, usually called the TPR valve, exists to release water if pressure or temperature inside the tank climbs to a dangerous level. Testing it means briefly lifting the test lever to confirm it opens and closes properly. A valve that doesn't respond, or that keeps dripping afterward, needs to be replaced rather than ignored.
120°F is a commonly recommended setting for most households. It's hot enough for typical use while reducing scald risk and limiting standby heat loss and mineral buildup compared to higher settings. It's worth confirming the setting hasn't drifted, especially after any recent service work on the unit.
A quick visual check around the base of the unit, the fittings, and the drain valve takes only a minute and can catch a small issue, like a loose fitting, before it becomes standing water on the floor. Look for rust streaks, damp spots, or mineral buildup around connections.
Tankless water heaters don't hold standing water, so they don't need sediment flushing, but mineral scale still builds up on the heat exchanger over time. Descaling clears that buildup and is one of the most effective ways to prevent the error codes and temperature fluctuations that come with a scaled-up unit.
DIY or Professional?
Some maintenance is simple and low-risk. Other tasks involve gas, electrical, or pressurized components worth leaving to a professional.
Visual inspections for leaks or corrosion, confirming the temperature setting, and clearing clutter or storage away from the unit for proper airflow and access.
Flushing the tank is manageable for homeowners comfortable working the drain valve and shutting off the unit's power or gas beforehand, though it does involve hot water.
Anode rod replacement, pressure-relief valve replacement, and tankless descaling are commonly handled by a technician, even by homeowners who flush their own tank.
Anything involving the gas line, gas valve, or electrical connections. These require specific testing equipment and carry real safety risk if handled incorrectly.
While You're At It
A maintenance visit isn't just about the tasks above — it's also a chance to catch a developing problem before it becomes a repair call.
Hot water with a faint metallic smell or slight discoloration can show up before it's obvious in every glass of water. Catching it during a scheduled check means a simple rod replacement instead of dealing with actual tank corrosion later.
A valve that's slow to reseat after testing, or that weeps slightly afterward, is often easier and cheaper to replace proactively than to deal with once it fails outright.
Minor vibration and thermal expansion over months and years can loosen fittings gradually. A small drip caught during a routine check is a quick fix; the same drip left for months can mean water damage to flooring or nearby drywall.
Putting It Together
Most of this checklist boils down to one thorough visit a year, plus the occasional quick look in between.
Flush the tank (or descale a tankless unit), test the pressure-relief valve, confirm the temperature setting, and check the anode rod's condition on a tank unit.
A one-minute visual check around the base and fittings for leaks, rust, or moisture. This catches small issues long before they become bigger ones.
On a tank unit, replacing the rod before it's fully depleted protects the tank itself from corrosion, which is the difference between a cheap part swap and eventual replacement.
New noise, a change in water color, or a temperature that's less consistent than usual are worth looking into between scheduled visits rather than waiting.
Noting the date of the last flush, anode check, and valve test makes it easy to stay on schedule and gives a technician useful context on any future visit.
Professional Maintenance
A single scheduled maintenance visit covers the full checklist above: tank flush or tankless descaling, anode rod inspection, relief valve testing, and a general check for leaks or corrosion. It's a straightforward way to knock out a year's worth of upkeep at once, without needing to track separate schedules for separate tasks.
Frequently Asked Questions
Most manufacturers recommend flushing a tank water heater once a year. Homes with harder water may benefit from flushing every 6 to 9 months, since mineral buildup accumulates faster and can shorten the unit's effective life if left unaddressed.
Flushing drains the tank and clears out sediment that settles at the bottom over time. That sediment insulates the water from the heating element or burner, making the unit work harder and less efficiently, and it's also the leading cause of the popping and rumbling noises homeowners notice.
A good rule of thumb is checking the anode rod every 2 to 3 years, or sooner if you're already seeing rusty or discolored hot water. Once the rod is significantly corroded, it stops protecting the tank, so replacing it before that point is one of the more effective ways to extend a tank's working life.
Homeowners comfortable working with the drain valve and shutting off the unit's power or gas supply can flush a tank themselves, and many do. That said, the process involves working around hot water and, on gas units, the pilot or ignition system, so if you're not comfortable with either, having a professional handle it is a reasonable choice.
The temperature and pressure-relief valve, usually called the TPR valve, is a safety device that releases water if pressure or temperature inside the tank gets dangerously high. It should be tested roughly once a year by lifting the test lever briefly to confirm it opens and closes properly. A valve that doesn't respond, or that won't stop dripping afterward, should be replaced.
120°F is a commonly recommended setting. It's hot enough for typical household use while reducing scalding risk and limiting mineral buildup and standby heat loss compared to higher settings. Households with a dishwasher that doesn't pre-heat its own water, or with specific medical needs, sometimes run slightly higher, but 120°F is a sensible default for most homes.
Yes. Tankless units don't need sediment flushing the way a tank does, but they do need periodic descaling, usually annually, to clear mineral scale from the heat exchanger. Skipping descaling is one of the most common reasons tankless units lose efficiency or throw error codes over time.
Anything involving the gas line, gas valve, or electrical connections is best handled by a professional, both for safety and because these components require specific testing to diagnose correctly. Anode rod replacement, TPR valve replacement, and tankless descaling are also commonly left to a technician, even by homeowners who handle basic flushing themselves.
Cost depends on what's included and the type of unit. A straightforward tank flush and inspection typically costs less than a repair visit, since it's preventive rather than diagnostic. We can give you a specific price when we know your unit type and what you're looking to have done.
Yes, meaningfully. Sediment buildup, a depleted anode rod, and a stuck relief valve are among the most common reasons water heaters fail earlier than their expected lifespan, and all three are preventable with routine maintenance. A well-maintained unit is more likely to reach or exceed the upper end of its typical service life.
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