Emergency Water Heater Repair and Replacement
A water heater leaking from the tank body cannot be repaired and needs replacement; a leak from a fitting or valve often can be. Shut off the water supply and the gas or breaker to the unit. Repairs run $180 to $700, replacement $1,000 to $3,200 nationally.
Need an emergency plumber now?
Connects with a licensed emergency plumbing partner. We publish information and do not perform repairs.
How urgent is this? A leaking tank is urgent because it will not stop and it usually accelerates. No hot water alone is uncomfortable rather than dangerous and can normally wait for standard-rate scheduling.
Typical cost: $180 to $3,200 nationally. Component repairs like thermostats, elements, and thermocouples sit at the low end. Tank replacement dominates the high end, and code upgrades required at replacement, such as expansion tanks, drain pans, or venting corrections, add to it.
Warning signs
- Water pooling around the base of the tank
- No hot water, or hot water that runs out far faster than it used to
- Rumbling, popping, or banging from the tank during heating
- Rusty or brown hot water
- The temperature and pressure relief valve discharging
- A gas smell near a gas-fired unit, which is an immediate evacuate-and-call situation
What causes it
- Sediment and scale accumulation insulating the tank bottom and overheating the steel
- A depleted anode rod allowing the tank lining to corrode through
- Thermostat or heating element failure on electric units
- Thermocouple, gas control valve, or pilot failure on gas units
- Excessive water pressure or thermal expansion with no expansion tank
What to do before the plumber arrives
- If you smell gas, leave the building first and call the gas utility from outside
- Shut off the cold water supply valve on top of the heater
- Turn off the gas control to pilot, or switch off the breaker for an electric unit
- If the tank is leaking, connect a hose to the drain valve and route it to a floor drain
- Do not attempt to relight a pilot if you smell gas at any point
What the plumber will actually do
Make the unit safe
Gas supply or the electrical breaker is shut off, and the cold water supply to the tank is closed. On a gas unit with any smell of gas, this happens before anything else.
Identify the leak source or failure mode
A leak from a fitting, valve, or connection is repairable. A leak from the tank body itself means the tank has corroded through and no repair exists.
Test components
For no-hot-water complaints, elements, thermostats, thermocouples, and gas valves are tested before any replacement is recommended.
Repair or replace
Component repairs are completed in place. Replacement includes draining, disconnecting, removing the old unit, and installing the new one to current code.
Verify safety systems
The temperature and pressure relief valve, discharge piping, expansion tank, and combustion venting on gas units are all verified before the job is closed out.
Water heater repair FAQ
My water heater is leaking. Can it be repaired?
It depends entirely on where the water is coming from. Leaks at the inlet or outlet fittings, the drain valve, or the T&P valve are repairable and often inexpensive. Water seeping from the bottom of the tank body means the inner tank has corroded through, and no repair exists for that; the unit must be replaced.
How long should a water heater last?
Eight to twelve years for a conventional tank unit, and fifteen to twenty for a well-maintained tankless. Hard water shortens that substantially. In very hard water regions, a tank without softening or regular flushing frequently fails at six to eight years.
Why is my T&P valve discharging water?
The temperature and pressure relief valve is a safety device doing its job. It discharges because the tank is overheating or over-pressurized, often from a failed thermostat or from thermal expansion with no expansion tank. Never cap or plug it. That valve is what prevents a tank from becoming an explosion hazard.
Is the popping noise from my water heater dangerous?
The noise itself is steam bubbles escaping through a sediment layer on the tank bottom, and it is a symptom rather than a hazard. What it signals is that sediment is insulating the steel from the water, which overheats the tank bottom and shortens the unit's life. Flushing helps early on; a heavily scaled tank usually cannot be recovered.
Related services
- Tankless Water Heater ServiceDiagnosis, descaling, and repair of tankless water heaters, including error code troubleshooting and flow sensor issues.
- Emergency Leak DetectionNon-invasive location of hidden water leaks behind walls, under floors, and beneath slabs using acoustic, thermal, and pressure testing equipment.
- Emergency Gas Line RepairEmergency repair of leaking gas lines and connections serving water heaters, furnaces, and appliances, performed by licensed technicians.
- Slab Leak Detection and RepairLocation and repair of water lines leaking beneath a concrete foundation, using acoustic and thermal detection to minimize concrete work.
Emergency guides
- Water Heater Emergencies: Leaks, No Hot Water, and SafetyWhich water heater problems need an immediate call, which can wait, and the safety issues that are genuinely dangerous.
- When to Call an Emergency Plumber (and When to Wait)After-hours plumbing costs 1.5 to 2 times standard rates. Here is which problems justify it and which are cheaper to schedule.
Cost guides
- Water Heater Replacement CostWhat tank and tankless water heater replacement costs, including the code upgrades that appear on the invoice unexpectedly.
- How Much Does an Emergency Plumber Cost?What emergency plumbing actually costs, how after-hours premiums work, and which problems are cheaper to schedule for morning.
- After-Hours Plumbing Rates ExplainedWhat the overnight, weekend, and holiday premiums actually are, and how to decide whether tonight's problem justifies paying them.
Common questions
- Leak and Pipe QuestionsHidden leaks, high water bills, frozen pipes, slab leaks, and when a system needs repiping rather than repair.
- Hiring and Licensing QuestionsHow to verify a plumber, what to ask before dispatch, and the pressure tactics worth refusing.
- Emergency Plumbing BasicsWhat counts as a plumbing emergency, what to do first, and how to tell whether a problem can wait until morning.
Related articles
- Your Water Heater Is Telling You It Is About to FailTank heaters give several months of warning before they flood a floor. The signs, in the order they usually appear.
- If Your Basement Backs Up When It Rains, Your Pipes Are FineRain-correlated sewer backups are a municipal capacity problem, not a blockage. Clearing your line will not stop it.
- The Empty House Problem: Why Seasonal Properties Fail in WinterA thermostat setting is not winterization. Why vacant properties produce the most expensive freeze damage there is.