Water Heater Maintenance:
What Every Homeowner Needs to Know
Your water heater is one of the hardest-working appliances in your home — and one of the most neglected. Regular maintenance can double its lifespan, cut your energy bills, and prevent a costly emergency. Here's your complete guide.
Schedule Service: (760) 753-3042The Cost of Neglect
Most Water Heaters Fail Before They Should
A well-maintained tank can last 12–15 years, and a well-maintained tankless unit 20 or more. Most homeowners never service theirs, so they end up replacing it around year 8 to 10, usually in an emergency with no time to compare options.
In San Diego's coastal climate, mineral scale from moderately hard water is the primary threat to water heater performance and lifespan. Salt air and temperature swings add additional strain. A simple annual service prevents the vast majority of early failures.
At Welch's Water Heating, we've been diagnosing and preventing these issues for 45+ years. The homeowners who call us for regular maintenance almost never face an emergency replacement — they replace on their own schedule, with time to plan.
How Maintenance Impacts Lifespan
Know the Warning Signs
Signs Your Tank Water Heater Needs Attention
Don't wait for a flooded garage or ice-cold shower. These are the red flags to watch for.
Water is rusty or discolored
Corrosion inside the tank — a sign the anode rod has failed or the tank is rusting from the inside.
Rumbling or popping sounds
Sediment has built up on the heating element and is literally boiling under the crust. Causes major efficiency loss.
Water around the base of the tank
A leak — either from a fitting (fixable) or the tank itself (replacement needed immediately).
Running out of hot water faster than usual
Sediment has reduced your effective tank capacity. A 40-gallon tank may only hold 20 gallons of usable hot water.
Pilot light keeps going out
Thermocouple failure — a common and inexpensive repair if caught early.
Unit is 10+ years old
At this age, even a well-maintained water heater should be evaluated. Failures become far more likely after year 10.
Signs Your Tankless Water Heater Needs Service
Error codes on the display
Modern tankless units display error codes. Don't ignore them — they pinpoint the issue precisely.
Water temperature fluctuations
Often caused by scale buildup on the heat exchanger, partially blocked inlet filters, or a failing flow sensor.
Unit ignites but shuts off
Could be a gas pressure issue, venting obstruction, or overheating protection activating.
Reduced hot water flow
Mineral scale restricts water flow through the heat exchanger. Common in San Diego's hard water areas.
Unit hasn't been flushed in 12+ months
North County San Diego has moderately hard water. Scale buildup is your tankless unit's biggest enemy.
Maintenance Schedule
Tank Water Heater Service Checklist
Flush the tank
Flushes out sediment that accumulates at the bottom. Sediment insulates the water from the burner, making the heater work harder and reducing its lifespan.
Inspect & replace the anode rod
The anode rod is a sacrificial metal rod that prevents your tank from rusting. When it's depleted, the tank starts corroding. Replacing it is one of the single best things you can do to extend your water heater's life.
Test the T&P (temperature & pressure) relief valve
This safety device prevents dangerous pressure buildup. If it doesn't operate properly, a water heater can become a serious hazard.
Inspect the burner & ignition system
Ensures efficient combustion and catches issues with the thermocouple or pilot assembly early.
Check the expansion tank
On closed plumbing systems, the expansion tank absorbs pressure. A failed expansion tank can damage your water heater and plumbing.
Tankless Water Heater Service Checklist
Tankless units are extremely reliable when properly maintained. Here's what needs to happen and when.
Flush with descaling solution
San Diego's water has mineral hardness that causes scale to form inside the heat exchanger. Annual flushing is the most critical maintenance task for tankless units.
Clean the inlet filter screens
Small screens at the unit's water inlet catch debris. Clogged screens reduce flow and can trigger error codes.
Inspect the venting system
Blocked or corroded venting can cause dangerous combustion gas backup. Always checked by a professional.
Test the condensate drain (condensing units)
Condensing tankless units produce acidic condensate. The drain must be clear to prevent damage to the unit and surrounding surfaces.
Full professional inspection
Includes gas valve, flow sensor, igniter, and flame sensor checks to ensure optimal efficiency and safety.
DIY vs. Professional
What Can You Do Yourself — and What Requires a Pro?
Homeowner Tasks
- Visually inspect for leaks around fittings
- Check that the pilot light is on
- Listen for unusual sounds (rumbling, popping)
- Note if hot water seems to run out faster
- Keep the area around the heater clear
- Check tankless unit display for error codes
Call a Professional For
- Annual tank flush and sediment removal
- Anode rod inspection and replacement
- T&P relief valve testing
- Gas line inspection and burner tuning
- Tankless descaling (requires special equipment)
- Any leaks, error codes, or unusual operation
- Expansion tank inspection
Schedule Your Annual Water Heater Service
An annual service visit can add years to your water heater's life and keep it running at peak efficiency. Call today to schedule. We serve all of North County San Diego. See repair and maintenance services.