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Quick Takeaway
Primary Insight: Water heater maintenance is a short annual routine that matters more in Fresno than in many places, because the city’s water ranges from moderately hard to very hard and minerals settle out of hard water when it is heated.
Key Fact: The City of Fresno’s 2024 water quality report lists average total hardness of 89.3 mg/L (5.2 grains per gallon), with a detected range of 65 to 190 mg/L, and the U.S. Geological Survey classes 61 to 120 mg/L as moderately hard and anything above 180 mg/L as very hard.
Best Suited For: Fresno homeowners with a tank water heater, especially one that is more than a few years old, who want to know what to check each year and what to leave to a licensed plumber.
A water heater will keep delivering hot water for years with no attention at all, which is exactly why most are ignored until something fails. The cost of that neglect shows up gradually: less usable hot water, a louder tank, and a shorter service life than the unit should have had.
Water heater maintenance fixes that with a handful of annual checks. This guide explains why the work matters in Fresno’s water, which tasks a homeowner can handle, which ones belong to a technician, and the warning signs that mean a maintenance visit has turned into a repair question.
Water Heater Maintenance at a Glance
The table below sorts the standard tasks by who should handle them. Gas connections, venting, and combustion are always professional work on a gas unit.
| Task | Who does it | How often |
|---|---|---|
| Look for leaks, rust, and unusual noises | You | Any time you are near the unit |
| Check the temperature setting | You | Once, then after any service |
| Note the unit’s age from its label | You | Once a year |
| Flush the tank to clear sediment | You, following the manufacturer’s manual, or a plumber | Annually is a sensible schedule in Fresno |
| Test the temperature and pressure relief valve | Plumber (recommended) | Annually |
| Inspect the anode rod | Plumber | Annually |
| Check gas connections, venting, and burner combustion | Licensed technician | Annually, on gas units |
Why Water Heater Maintenance Matters in Fresno’s Water
Water heater maintenance matters in Fresno because hard water leaves mineral deposits in a tank when it is heated, and those deposits cut into capacity and efficiency over time. The U.S. Geological Survey explains that when hard water is heated, solid deposits of calcium carbonate can form, and that this scale can reduce the life of equipment and raise the cost of heating water.
The City of Fresno’s own numbers show why this applies locally. Its 2024 report lists an average hardness of 89.3 mg/L with a range of 65 to 190 mg/L, which spans the USGS moderately hard and very hard categories depending on the day and the part of the system.
ENERGY STAR makes the same link from the appliance side: aging and poor maintenance can cause sediment to build up inside the tank in a way that reduces capacity, and the rumbling many tanks develop is often a sediment layer on the bottom. If you already see signs of mineral buildup, our guide to hard water and water softeners covers the options for treating it at the source.
Flushing the Tank: What It Does and Who Should Do It
Flushing a tank water heater removes the sediment that has settled at the bottom, which restores capacity and reduces the strain behind a rumbling tank. Many homeowners can do it, but the manufacturer’s manual should set the steps, since procedures differ by model.
The general sequence is to turn off the power or gas supply to the unit and the cold-water supply, let the water cool, connect a hose to the drain valve, drain the tank to a safe location, and flush until the water runs clear. Hot water scalds quickly, so a technician is the better choice if the unit is hard to reach or the drain valve is stiff or clogged with sediment.
A tank that produces little or no flow from the drain valve is usually heavily sedimented, and forcing it can damage the valve. That is a good reason to have a plumber handle the first flush on an older tank.
The Pressure Relief Valve and Anode Rod: Leave These to a Technician
The temperature and pressure relief valve is the safety device that protects the tank from excess pressure, so it should be tested and replaced only by someone who knows what a failed one looks like. The CPSC notes that a failing relief valve can fail to reduce pressure and avert failure or rupture of the water heater tank. Our guide to the water heater pressure relief valve explains how it works.
Testing the valve can release very hot water. The CPSC reports that most adults will suffer third-degree burns if exposed to 150 degree water for two seconds, so if you test it yourself, follow the manual, use a bucket, and stay clear of the discharge. Many homeowners leave the test to the annual visit.
The anode rod sits inside the tank and is inspected during a professional visit. Its condition tells a technician how much protection the tank has left, which is useful information when deciding whether to repair or replace an aging unit.
Check Your Water Heater’s Temperature Setting
A water heater’s temperature setting should be 120 degrees Fahrenheit for most homes, according to the CPSC, which urges all users to lower their water heaters to 120 degrees Fahrenheit to reduce scald injuries. The U.S. Department of Energy also recommends turning the thermostat down to 120 degrees as a way to save energy.
Check the dial or the display, and ask the technician to confirm the setting at the next visit. Households with young children or older adults have the strongest reason to confirm it.
Warning Signs Your Water Heater Needs Attention Now
Some symptoms mean maintenance is no longer enough and the unit needs repair or replacement planning. ENERGY STAR lists the common ones:
- Rust in the water: usually a sign that the interior of the water heating system is corroding and breaking down.
- Leaks: leaks from any joints, seals, or seams are usually an indication there is a problem.
- Unusual noises: rumblings or vibrations mean the unit is likely straining to operate correctly.
- Age over 10 years: ENERGY STAR advises considering replacement for units more than 10 years old, before an emergency forces the decision. The Department of Energy puts the typical storage tank lifespan at 10 to 15 years, with proper maintenance as the key.
If your tank runs out of hot water sooner than it used to, read our guide to why you keep running out of hot water, and see our list of signs you need a new water heater. Tankless owners should use our tankless maintenance signs guide instead, since the maintenance needs differ.
Frequently Asked Questions
How often should water heater maintenance be done?
Water heater maintenance should be done at least once a year, with a flush and a professional check of the relief valve and anode rod. Fresno’s moderately hard to very hard water is a good reason not to stretch that interval, and the manufacturer’s manual may specify its own schedule.
How do you flush a water heater?
To flush a water heater, turn off the power or gas supply and the cold-water supply, let the water cool, connect a hose to the drain valve, drain the tank to a safe location, and flush until the water runs clear. Follow the manufacturer’s manual, since steps differ by model, and call a plumber if the drain valve is stiff or clogged.
Is water heater maintenance really necessary?
Water heater maintenance is necessary to protect capacity, efficiency, and service life, because the Department of Energy says proper maintenance is key to a storage tank reaching its typical 10 to 15 years. Sediment from hard water is the most common reason tanks lose capacity.
How long does a water heater last?
A storage tank water heater typically lasts 10 to 15 years, according to the Department of Energy, and ENERGY STAR advises considering replacement once a unit is more than 10 years old. Our guide to how long water heaters last covers what affects that range.
Can I do water heater maintenance myself?
You can do part of water heater maintenance yourself, specifically the visual checks, the temperature setting, and a manual-guided flush, but the relief valve test, anode rod inspection, and gas and venting checks are better left to a technician. Scald and gas risks are the reasons.
Keep Hot Water Reliable All Winter
Maintenance is easiest to think of as protecting a single outcome: hot water that is there when you want it, for as many years as the tank can give. The annual routine costs little compared with an unplanned failure in the middle of winter.
If your water heater is due for its annual check, or you are seeing any of the warning signs above, contact Allbritten about water heater service and a technician will inspect the unit and tell you what it needs. To catch the rest of your plumbing before it becomes a problem, read about our plumbing maintenance in Fresno.