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The Annual Water Heater Maintenance Checklist (Wheaton Homeowner's Guide)

The Annual Water Heater Maintenance Checklist (Wheaton Homeowner's Guide)

Here's an industry secret: the vast majority of water heater failures are preventable. Sediment, depleted anodes, unchecked pressure, and untested valves cause nearly every premature leak we repair — and every one of them is addressable in a single annual visit. This is the exact checklist our technicians work through.

1. Flush the tank (or descale the tankless)

Drain several gallons — ideally a full flush — until the water runs clear. In our moderately hard water, annual flushing prevents the sediment layer that overheats tank bottoms and kills lower elements. Tankless units need a descaling flush with the manufacturer's procedure instead.

2. Inspect the anode rod

Every 2–3 years, check the anode's remaining thickness. Under half an inch or heavily coated with calcium means replacement time. This $200–$400 service is the highest-ROI item on the list — it's literally what stands between corrosion and your tank wall.

3. Test the T&P valve

Lift the test lever briefly and confirm water flows, then releases cleanly and reseats without dripping. A valve that won't reseat needs replacement — a 5-minute test that verifies your primary safety device.

4. Check system pressure

Static pressure should read under 80 PSI; the expansion tank should hold its air charge. High pressure silently stresses every seal and is the hidden cause behind many 'mystery' T&P drips.

5. Inspect valves, fittings, and the pan

Look for weeping at the drain valve, dielectric unions, and inlet/outlet connections. Check the drain pan for standing water and confirm the leak sensor (if installed) is working. Catching a weep now prevents a rupture later.

6. Verify temperature and venting (gas units)

Confirm 120°F delivery at the tap and check the draft hood and venting for proper draft. Combustion safety is non-negotiable on gas heaters.

DIY vs. professional

Homeowners can handle visual inspections and temperature checks. Flushing, anode service, pressure diagnostics, and anything involving gas belong to professionals — both for safety and because we spot the subtle warning signs that untrained eyes miss. Our annual maintenance visit covers the full checklist in about an hour: call (833) 713-2101 to schedule.

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Frequently Asked Questions

Our diagnostic visit is $89–$149; a full annual maintenance service (flush, anode check, valve tests, pressure check, condition report) is quoted transparently before we begin.

Sediment bakes on, the anode depletes, and pressure issues go unnoticed — the classic recipe for a tank failing at year 8 instead of year 14. It's never too late to start, though.

A modified version: annual descaling replaces flushing, plus condensate system checks, venting inspection, and error-code review.

Need a Pro? Call (833) 713-2101

Ready to put your heater on a real maintenance schedule? One annual visit covers the full checklist — call to enroll.

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📞 (833) 713-2101