Water Heater Repair in McLean, VA
No hot water, a leaking tank or popping noises? We repair and replace gas, electric and tankless water heaters across McLean, day or night.
- Gas, electric & tankless
- Repair or replace
- Open 24/7
A water heater works hard every day. Most fail slowly. Sediment builds up, the anode rod wears away and parts wear out. We find what is really wrong before we suggest a fix. That way you do not replace a heater that only needs a part. If water is pooling under the tank right now, read our water heater leaking guide and call; a leaking tank can turn into an emergency quickly.
What our water heater service includes
- Diagnosis of gas, electric, power-vent and tankless water heaters.
- Thermostat, heating element, igniter, thermocouple and gas valve replacement.
- Temperature and pressure relief valve testing and replacement.
- Anode rod inspection and replacement.
- Tank flushing to remove sediment.
- Expansion tank installation where pressure is high.
- Full replacement, including haul-away of the old unit.
- Tankless installation and descaling.
Signs and causes
| Symptom | Likely cause | Repair or replace? |
|---|---|---|
| No hot water (electric) | Failed element, thermostat or tripped high-limit | Usually repair |
| No hot water (gas) | Pilot, igniter, thermocouple or gas valve | Usually repair |
| Hot water runs out fast | Failed lower element, sediment or a broken dip tube | Usually repair |
| Popping or rumbling | Sediment on the tank bottom | Flush; replace if severe |
| Rusty hot water | Worn anode rod or rusting tank | Anode rod or replace |
| Water at the relief valve | High temperature or pressure, or a bad valve | Repair; may need expansion tank |
| Water from the tank body | Corroded tank | Replace |
| Rotten egg smell | Reaction between the anode rod and water | Change anode type |
How water heater repair works in McLean
- Make it safe. We check the gas or power supply, the relief valve and any leak.
- Diagnose. We test elements, thermostats, igniters and valves, and look at the anode rod and tank condition.
- Explain your options. Repair cost, the heater's age and condition, and replacement options, including tankless.
- Repair or install. We replace the failed part or install the new heater with correct venting, relief valve piping and connections.
- Test. We check temperature, pressure, venting and for leaks, and show you how to shut it off.
Tank vs tankless
| Feature | Tank | Tankless |
|---|---|---|
| How it works | Stores and keeps water hot | Heats water as it flows |
| Hot water limit | Runs out when the tank is used up | Steady supply up to the unit's flow rating |
| Upkeep | Flush and check anode rod | Descale periodically |
| Install changes | Usually a direct swap | May need gas line, venting or electrical work |
| Space | Larger footprint | Wall-mounted |
What affects the cost
- Repair part versus full replacement.
- Fuel type: gas, electric or propane.
- Tank size or tankless model.
- Venting, gas line and electrical changes.
- Expansion tank or drain pan needs.
- Permit and inspection in Fairfax County.
- Access, such as a tight closet or finished basement.
DIY vs calling a pro
You can check the breaker on an electric heater. You can relight a pilot by following the label. You can set the temperature dial. Handy owners can flush a tank. Leave gas valves, venting, relief valves and replacements to a plumber. Fairfax County requires a permit for gas water heater replacement, and a poorly vented gas heater can put carbon monoxide in the house.
Permits and insurance in Virginia
Fairfax County's Household Appliance permit covers replacing an appliance, and the county states that gas water heater replacement requires a permit even when it is like-for-like. New gas piping needs a residential plumbing permit instead. For insurance, Virginia's Bureau of Insurance says to give immediate notice of a possible claim if water has caused damage, and to protect the property from more harm.
Local note
Basement water heaters are the norm in Vienna and Oakton homes, so a tank leak can soak finished basements. Townhomes in Reston and Herndon often have heaters in a first-floor closet, where a drain pan matters. Homes on private wells in Great Falls may need more frequent flushing, depending on the well's water quality.
Water heater repair questions
Should I repair or replace my water heater?
Repair makes sense when one part fails on a sound tank. Common parts are the thermostat, element, igniter, thermocouple, gas valve and relief valve. A leak from the tank itself usually means replacement, because a rusted tank cannot be patched.
Why is my water heater leaking?
Common causes are a loose drain valve, a relief valve releasing because of high temperature or pressure, a loose connection, condensation, or a corroded tank. Our water heater leaking guide shows how to tell them apart.
Do I need a permit to replace a water heater in Fairfax County?
Fairfax County says gas water heater replacement requires a permit, even for a like-for-like swap. New gas piping needs a residential plumbing permit. Ask us about electric units, as the rules differ.
What temperature should my water heater be set to?
Many manufacturers and energy guides suggest about 120°F as a balance of comfort, energy use and scald risk. Households with special needs should ask their doctor or the manufacturer.
Why does my water heater make popping noises?
Popping or rumbling usually means sediment has built up at the bottom of the tank. Heat has to push through it, which wastes energy and stresses the tank. Flushing can help if the tank is not too far gone.
Do you install tankless water heaters?
Yes. Tankless units heat water on demand. Switching from a tank may need gas line, venting or electrical changes, which we review with you before you decide.
Sources
- Fairfax County Land Development Services — Household Appliance Permit
- Fairfax County Land Development Services — Residential Plumbing Permit
- Virginia State Corporation Commission, Bureau of Insurance — Homeowners Insurance Consumer's Guide
Last reviewed 2026-11-07. This page is general information, not legal or insurance advice. Read how we research and check pages in our editorial policy.
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No hot water or a leaking tank? Call for water heater repair.
Call McLean Plumber Works any time, day or night. A plumber picks up and talks you through next steps.