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Gas water heaters run continuously, every day of the year, cycling burners and heating elements that never get an off-season rest. Utility gas heats more occupied homes in Pima County, Arizona than any other fuel, at 50.8% (2020-2024 ACS 5-year). That share of the housing stock means the gas water heater is the standard appliance a contractor opens here, and the failure patterns they find reflect it: anode rods depleted by hard water, burner assemblies fouled by mineral-laden sediment, and pilot or ignition components worn down by constant cycling. A unit that starts showing irregular heating or a pilot that won't hold is usually carrying sediment load at the bottom of the tank, and that is where a contractor checks first.

Water heaters sitting in houses built for an earlier generation of equipment can outlast the parts catalog that was designed around them. Half the homes in Pima County, Arizona were built in 1986 or earlier (2020-2024 ACS 5-year). When a contractor opens a unit in stock this old, the question that decides the repair is whether the component that failed is still in production, or whether the job becomes a sourcing problem before it is a mechanical one. A discontinued anode rod, a valve assembly no longer stocked, a thermostat that takes a proprietary fitting: any of those turns a straightforward repair into a longer conversation about what is actually available.
The Parts of a Water Heater a Contractor Checks First

The tank is the piece a homeowner knows best, sitting in a utility closet, basement, or garage and holding the supply of hot water the house draws from. The burner assembly at the base of the tank, or the heating elements inside an electric unit, are where a contractor looks when the water runs cold or the unit stops responding.
The thermostat controls the temperature the unit holds, and a fault there shows up as water that is scalding, lukewarm, or inconsistent. The pressure relief valve, the anode rod inside the tank, and the inlet and outlet connections at the top are the other pieces a contractor examines when the tank itself is not the source of the problem.
The drawing shows a typical water heater layout, and a licensed contractor determines which parts apply to the specific unit and setup in your home.
Find a contractor in Pima CountyPima County, by the numbers
405 severe weather events were recorded in Pima County, Arizona between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Pima County, Arizona were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPima County, Arizona holds 479,939 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 65.2% of the occupied homes in Pima County, Arizona (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Pima County
Extreme weather puts real stress on water heaters, forcing them to work harder and fail sooner. How much of that stress your unit carries depends on what the local climate actually delivers.
405 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
