Hot Water Heater Repair in Baltimore, MD

Hot water heater repair replaces the failed part of a tank, tankless or hybrid water heater, such as a leaking fitting, relief valve, element, thermostat, gas valve or igniter; a tank that leaks from its own body is replaced instead.

Call (410) 378-7792, 24 hours a day, and Speedy Plumbing Baltimore connects you with a licensed, insured contractor from our network in Baltimore City or nearby Baltimore County, who finds the fault and gives you an upfront price before work starts, at the same rate after hours.

Call (410) 378-7792

Water under the tank? Switch off its power or gas and close the cold water valve, then call.

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Network contractors charge the same rate at night, on weekends and on holidays

What should you do when a water heater is leaking?

Turn the water heater off, then close the valve on the cold water line that feeds it. A. O. Smith, the manufacturer, says to treat a leak as urgent: switch off the breaker on an electric model or close the gas shut-off valve on a gas model, and never attempt repairs while power and water are connected.

Smell gas? Skip these steps and leave the house first. BGE says not to turn anything off when you smell gas; its instructions are in what to do about a gas smell or carbon monoxide.

Switch off the heat source. Flip the circuit breaker for an electric heater, or close the gas shut-off valve for a gas heater.
Close the cold water valve at the heater. The International Plumbing Code that Baltimore City adopts calls for a valve on the cold water line near each water heater, serving only that heater. If it is missing or will not turn, close the main valve for the whole house instead, using this walkthrough for locating the whole-house water shut-off.
Find where the water is coming from. A. O. Smith ties a leak at the top to the pipe fittings and connections, a leak at the side to the temperature and pressure (T&P) relief valve, and a leak at the base to a problem inside, often a corroded tank. It also notes that condensation on a heater is often mistaken for a leak.
Call (410) 378-7792. Say where the water appears, whether the heater runs on gas or electricity, and whether the cold water valve closed.

A drip from a supply connection above the heater is a piping job, handled like any other repair of leaking supply pipes and fittings. When a pipe has burst elsewhere in the house and the heater is only at risk, the main valve closes first; that order is set out in turning off a water heater when a pipe bursts.

What should you do if you smell gas or suspect carbon monoxide?

Get out of the house, move at least 100 feet away and call 911 or BGE at 877-778-7798. BGE says not to turn anything off, open a window or look for the leak, and not to go back inside until authorities say it is safe. BGE checks gas odors 24/7 at no cost.

A. O. Smith’s gas water heater manual (2016 edition) adds: do not light any appliance, touch an electrical switch or use a phone inside the building, and call the gas supplier from a neighbor’s phone.
For suspected carbon monoxide poisoning, the CPSC says to get outside to fresh air immediately, then call 911. The CDC lists headache, dizziness, weakness, upset stomach, vomiting, chest pain and confusion as the most common symptoms, and warns that people who are asleep can die before symptoms appear.
BGE lists stuffy, stale or smelly air, high humidity and soot as signs of carbon monoxide buildup, and says to call a qualified heating contractor immediately when a water heater is the suspected source.
BGE and the CDC both say to have a gas water heater checked by a qualified technician every year. The CDC adds that a water heater’s horizontal vent pipe should rise slightly as it runs toward the outdoors.
The CDC recommends battery or battery-backup CO detectors near every sleeping area, replaced as the manufacturer directs or every 5 years. An older Baltimore County permits notice says Maryland law requires CO alarms in fossil-fuel homes built under permits issued on or after January 1, 2008.

After authorities say the house is safe, a licensed, insured contractor from our network can repair the gas side of a water heater, including the gas valve, thermocouple, burner and venting.

Why is the water heater relief valve leaking?

A temperature and pressure (T&P) relief valve releases water when the temperature or pressure inside the tank climbs too high. Occasional discharge and steady dripping have different fixes: A. O. Smith’s 2016 manual ties the first to thermal expansion and says the second calls for a new valve fitted by a qualified person, such as a licensed plumber.

Never cap, plug or remove a relief valve or its discharge pipe. A. O. Smith warns that ignoring this instruction can result in an explosion or death.

Discharges now and then: a closed system, such as one with a check valve or backflow preventer on the supply line, needs a thermal expansion tank, according to both A. O. Smith and Rheem. Rheem’s 2024 manual says replacing the relief valve will not correct the problem.
Drips or leaks steadily: A. O. Smith says to use only a new valve, never an old or existing one, and that no valve may sit between the relief valve and the tank.
Drips because the water pressure is high: A. O. Smith’s 2021 electric manual says a small drip usually means the home’s water pressure is too high or a properly sized expansion tank is missing, and its 2016 gas manual answers excessive water pressure with a pressure-reducing valve. When the pressure is 50 to 60 psi, a pressurized expansion tank is in place, the valve is clear of debris and it still drips, the manual says to have a qualified person replace the valve.
Test it once a year: A. O. Smith says to operate the valve by hand at least annually. If it fails to reseat and keeps releasing water, shut off the manual gas control valve and the cold water inlet valve, then call a qualified person.
Baltimore City code: the City adopts the 2021 International Plumbing Code water heater chapter unchanged. As reproduced by UpCodes, that chapter bars using the relief valve to control thermal expansion, and requires the discharge pipe to end no more than 6 inches above the floor or receptor, with no valve, tee fitting or threaded end.

Replacing a failed relief valve and adding an expansion tank are water-side repairs that plumbers in our network handle, priced before the work begins.

Why does a water heater stop making hot water?

A tank water heater that stops making hot water without leaking needs its heat source checked: the thermostats and heating elements on an electric unit, or the gas control valve, pilot and burner on a gas unit. Cost guides price thermostats, elements, gas valves and thermocouples as separate repairs, so the failed part sets the bill.

No hot water from an electric water heater
- An element that burned out in a partly empty tank. A. O. Smith says an electric element burns out when too little water surrounds it, which is why a drained tank must refill before the breaker goes back on.
- A failed thermostat or heating element. HomeAdvisor prices each as its own professional replacement, and puts the thermostat part itself at about $20.
- Plumbers in our network test and replace thermostats and heating elements on electric tank heaters.
No hot water from a gas water heater
- A faulty gas control valve. HomeAdvisor calls replacing one a common repair.
- A failed thermocouple, which Fixr prices as a separate replacement.
- Licensed gas fitters in our network repair gas control valves, thermocouples, pilots and burners.
- A gas smell at any point means leaving the house and calling BGE before anything else.

What are the signs a hot water heater needs repair?

Less hot water, rumbling from the tank, a rotten-egg smell from the hot tap, rusty or low-pressure hot water, and soot or a yellow burner flame are the warning signs; each points to a specific part or fault.

Less hot water than before: A. O. Smith’s 2021 electric manual says a failed lower element or lower thermostat still leaves some hot water, but not as much, and that the lower element usually wears out first because it does most of the work. Its 2016 gas manual adds a thermostat set too low, sediment or lime in the tank, a heater too small for the household, leaking faucets and low gas pressure. Check several taps first: the electric manual says a failed thermostatic mixing valve in a shower control can reduce the hot water at that shower even when the tank is full.
Rumbling, popping or sizzling: the gas manual calls the expansion and contraction of metal parts, and condensation dripping onto the burner, normal sounds. Sediment buildup on the tank bottom also makes noise and may cause the tank to fail early, and Rheem links a rumbling noise to scale or mineral deposits.
A rotten-egg smell from the hot water: A. O. Smith’s gas manual calls it the most common complaint tied to the anode rod, caused by hydrogen sulfide gas dissolved in the water, and its electric manual adds harmless bacteria that multiply in the tank. A special zinc anode may reduce it, though the electric manual calls chlorination the only sure treatment, and taking the anode out for good voids the warranty. Natural gas also smells like rotten eggs: if the smell is in the air around the heater rather than in the hot water, get out of the house and call 911 or BGE at 877-778-7798, following BGE’s gas smell steps.
Rusty water from the hot taps only: HUD’s 2000 rehabilitation inspection guideline says rusty water points to galvanized steel somewhere in the supply line or, when it appears only on the hot side, to rust in the water heater. A. O. Smith says the anode rod slowly wears away to protect the glass-lined tank, and once it is used up the tank starts to corrode and eventually leaks.
Low pressure on the hot side only: the electric manual blames melted heat traps or a melted dip tube, which soldering copper pipe while it is attached to the heater can cause, or a partly closed supply valve at the heater.
Soot, a yellow flame or combustion odors on a gas heater: the gas manual lists too little combustion air, a clogged flue and a heater installed in a confined area among the causes. The same heater has a thermal switch that shuts off the gas when a blocked vent or too little combustion air causes poor combustion; the carbon monoxide warning signs are listed above.

What fails on gas, electric, tankless and hybrid water heaters?

Each type fails in its own parts: gas tanks at the pilot, igniter, gas valve and venting; electric tanks at elements, thermostats and the high-limit cutoff; tankless units at scale and ignition; hybrids at the air filter and condensate line.

Gas water heater repair: pilot, gas valve and venting
- A pilot that will not light or stay lit: A. O. Smith’s 2016 gas manual lists a failed igniter or flame sensor, low or no gas pressure, air or dirt in the gas line, cold drafts, a clogged pilot orifice, blocked combustion air and a tripped thermal switch.
- An overheat shutoff: the same manual puts the high-limit sensor inside the gas control valve, set to shut the heater off above 189°F. An “ECO Lockout” means the whole gas control valve is replaced by a qualified person.
- Venting: a gas tank has a flue, draft hood and flammable vapor ignition resistant (FVIR) system that an electric tank lacks. A. O. Smith says to correct a venting or combustion air problem before resetting the thermal switch.
Electric water heater repair: elements, thermostats and energy cutoff
- A tripped Energy Cut Off (ECO): the red button on the upper thermostat cuts power to the elements when the water overheats. A. O. Smith’s 2021 electric manual says a trip usually means a failed element or thermostat, and that power stays off until a qualified person finds the cause.
- Other no-hot-water causes in the same manual: a burned-out upper element, a broken upper thermostat or wiring, inlet and outlet pipes connected in reverse, and a leak on the hot side.
- Error codes on electronic models: A. O. Smith shows the high limit as E02 and upper and lower element circuit failures as E04 and E05.
Tankless water heater repair: scale, ignition and flow
- Scale: Rinnai, Navien and Noritz manuals all call for flushing a home unit once a year on hard water. Rinnai says skipped flushing damages the heat exchanger, its warranty excludes scale damage, and an “LC” or “00” code means scale has built up.
- Ignition and flame loss: Noritz ties code 11 to missing air, spark or gas, and code 12 to flame loss, such as a gas supply too small for several gas appliances running at once.
- Flow limits: a tankless unit needs a minimum flow to fire, 0.5 gallon per minute on Navien models. A DOE page archived in 2026 put typical output at 2 to 5 gallons per minute.
- Gas and venting: Rinnai says the gas pipe must be sized for the home’s whole gas load, and that an old tank heater’s flue may not suit a tankless unit.
- Cost: HomeAdvisor (Jun 2026) puts a tankless water heater repair at $75 to $1,300, with an average of $600 nationally; Fixr’s older page, updated January 2025, gives $100 to $650.
Hybrid (heat pump) water heater repair: air filter and condensate
- How it heats: ENERGY STAR calls a heat pump water heater a “hybrid electric” unit. It moves heat from the room air into the tank, and backup electric elements take over in cold conditions.
- Room size: DOE’s archived guidance and ENERGY STAR’s product page call for a space that stays between 40°F and 90°F with at least 1,000 cubic feet of air. Rheem’s hybrid manual allows smaller rooms, down to 450 cubic feet, with louvers and lower output.
- Condensate: Rheem requires a 3/4-inch condensate drain sloped at least 1/8 inch per foot, or a condensate pump. A blocked line (alarm A108) switches the heater to its elements.
- Air filter: Rheem says to clean the filter when the unit shows its reminder, and low airflow (alarm A005) also drops it to element heating.

When you call (410) 378-7792, say whether the heater is gas, electric, tankless or hybrid and read out any code on its display, so a licensed, insured contractor from our network arrives ready for that type.

Should a water heater be repaired or replaced?

Repair a water heater when the fault is a replaceable part such as a fitting, relief valve, thermostat or element; replace it when the tank itself leaks. A. O. Smith says every tank eventually leaks from normal corrosion.

The manufacturer adds that replacing an old leaking water heater is usually more cost-effective than repairing it.

Age: a Department of Energy page archived in 2026, and since removed, put tank water heaters at 10 to 15 years. A. O. Smith gives a wider 8 to 20 years depending on the type.
A leak at the base: A. O. Smith says this is often the first sign of a serious internal problem, such as a corroded tank, that is usually more practical to replace than repair.
Flood damage: A. O. Smith says not to use a gas water heater if any part has been under water, and that submerged gas controls, a submerged main burner or a submerged pilot require replacing the entire heater. When the basement flooded because its sump pump stopped, the pump needs emergency sump pump repair before the next heavy rain as well.
Leaks from parts: water at the top fittings or from the relief valve on the side comes from components that can be repaired or replaced without a new tank.
Protection underneath: A. O. Smith recommends a metal drain pan under the heater to catch leaks from the tank or its piping connections.

Fixr (Jan 2026) puts an installed tank water heater at $600 to $2,500 nationally. Permits, power venting, expansion tanks, haul-away and fuel conversions are extra.

Repair or replace, by water heater type

The half-cost rule: This Old House says to replace a water heater at 10 years old or once a repair costs more than half the price of a new unit. HomeAdvisor’s tankless guide sets the same half-price line and calls repair cost-effective on a system under 10 years old.
Gas tank: an “ECO Lockout” on an A. O. Smith gas control valve is a part replacement, not a new heater; HomeAdvisor (Jun 2026) prices a gas valve replacement at $150 to $500. A gas heater whose controls, burner or pilot went under water is replaced whole, as covered above.
Electric tank: elements and thermostats are separate parts, so a tripped ECO caused by one of them points to a part repair rather than a new heater, as long as the tank is not leaking.
Tankless: a DOE page archived in 2026 said most tankless units last more than 20 years and have easily replaceable parts. Repairs run $75 to $1,300 (HomeAdvisor (Jun 2026)) against $1,406 to $3,901 for a new installed unit (HomeAdvisor (Jun 2026)).
Hybrid: DOE’s archived comparison table gave heat pump water heaters about 10 to 15 years, and ENERGY STAR says their life span is similar to an electric storage heater’s. HomeAdvisor (Jun 2026) puts an installed hybrid heat pump water heater at $1,200 to $3,500 nationally.

How should a tank water heater be set and maintained?

Set the thermostat to 120°F and drain sediment on the schedule in your heater’s manual. The CPSC urges every household to use 120°F to prevent scalds and save energy, and A. O. Smith says sediment left in the bottom of the tank makes noise and may cause the tank to fail early.

120°F and scald risk

Hot water exposure that causes third-degree burns in adults (CPSC)
Water temperature	Time to a third-degree burn
150°F	2 seconds
140°F	6 seconds
130°F	30 seconds
120°F	5 minutes (possible)

The Department of Energy’s federal buying guidance for residential water heaters, updated May 2024, also sets most homes at 120°F.
A. O. Smith calls 120°F the preferred starting point and says turning the dial past the 120°F mark increases the risk of scalding.
A DOE Energy Saver page archived in 2026, and since removed, said 120°F slows mineral buildup and corrosion, and that a 140°F setting can waste $36 to $61 a year in standby heat loss.
The same DOE page said 120°F carries a very slight Legionella risk that is still safe for most people. Anyone with a weakened immune system or chronic lung disease may consider 140°F, with mixing valves on bathing and washing taps to limit scalds.

Draining and flushing sediment

Sources disagree on how often to flush, so follow the manual for your model:

DOE’s archived storage water heater page: flush a quart of water every three months, check the T&P valve every six months and inspect the anode rod every three to four years.
A. O. Smith’s 2016 gas manual: drain and flush the tank every 6 months, and inspect the anode rod after no more than three years, then every year, or every year from the start on softened water. Its current consumer page says to flush once a year and that anode rods usually last 3 to 5 years.
Rheem’s 2024 manual: drain a few quarts every month. Rheem links a rumbling noise to scale or mineral deposits.
Baltimore City water: the Department of Public Works (DPW) 2022 mineral analysis from its Montebello laboratory, since removed from the City’s website, averaged 114 mg/L of hardness, between 109 and 120 by month. Rinnai’s and Navien’s tankless manuals put 61 to 120 mg/L in a class that calls for flushing a home unit once a year.

Turn off the heat. Shut off the power to an electric heater, per Rheem. On a gas heater, A. O. Smith says to close the manual gas shut-off valve and move the gas control switch to “OFF.”
Open a hot water faucet. A. O. Smith’s manual says to run a nearby tap until the water is no longer hot; Rheem opens one to let air into the tank.
Close the cold water inlet valve. This stops the tank from refilling while it drains.
Attach a hose to the drain valve. Run it to a floor drain or outside the building.
Open the drain valve. Let the tank empty, flushing with water as needed to clear sediment.
Refill before restarting. Close the drain valve and reopen the cold water supply. Let the tank fill completely before an electric heater’s power comes back on.

Permits and licensing for water heater work in Baltimore

Replacing a water heater needs a permit and a licensed tradesperson in both Baltimore City and Baltimore County. Baltimore City lists hot water heaters as trade-permit work, and Baltimore County requires a permit and inspection for all plumbing and gasfitting.

The City list comes from its Department of Housing and Community Development; the County rule comes from its Permits, Approvals and Inspections office.

Baltimore City

Under the City’s ePermit guidelines (revised December 2021 and still linked from its permit page), a hot water heater replaced in kind, at the same size and location, needs no drawings. The guidelines require a licensed contractor for hot water heaters and replacement gas appliances, and a gas fitter license for gas piping.
The City’s installation and replacement permit page, updated October 2025, asks for the contractor’s name and registered license.
The 2024 City Building Code sets a $20 fee for an electric water heater and $30 for a gas-fired appliance up to 200,000 BTU per hour, plus a nonrefundable $25 application fee for 1- and 2-family homes. Work done without a permit carries a surcharge of $1,000 or 50% of the permit fee, whichever is greater.

Baltimore County

The County plumbing code names replacement among the work that needs a permit.
The County fee schedule found took effect in November 2018, so confirm current fees with Permits, Approvals and Inspections: $30 for an oil or electric hot water heater, and gas permits from $30 for the first appliance plus $14 for each additional one.
The code requires a drip pan under a tank water heater where a leak would cause damage, at least 1-1/2 inches deep and drained by pipe at least 3/4 inch. A replacement heater needs none if the old one had none, and a plastic pan may sit under a gas heater only when it is labeled for gas.
After installation, the heater’s temperature controls must be set no higher than the maximum for their use and tested before the job is approved.

Who may work on which side of a water heater

Maryland law requires a State Board of Plumbing license to provide plumbing services, which the statute says include repairing gas utilization equipment, and a Board license to provide natural gas services on gas-fired equipment connected to a natural gas supply. That natural gas definition excludes water heaters, relief valves and expansion tanks where they connect to the plumbing water supply and drainage system. Baltimore County does not use State licenses; its own Plumbing and Gasfitting Board licenses plumbing and gasfitting.

Speedy Plumbing Baltimore connects callers with contractors licensed for both the water side and the gas side of tank water heaters.

City or County rules apply depending on which side of the city line an address sits. The jurisdiction for each ZIP code our network covers is listed in the ZIP-by-ZIP service area directory.

How much does water heater repair cost?

HomeAdvisor (Jun 2026) puts a typical water heater repair at $228 to $1,017 nationally, with an average of $615. Fixr’s water heater repair guide gives a lower $150 to $750. Where a job lands depends on whether the heater is gas or electric and which part failed.

The contractor we connect you with quotes the repair upfront, and work starts only after you approve the price. Network contractors charge the same rate at night, on weekends and on holidays.

Typical water heater repair and replacement costs (U.S. national ranges)
Repair or charge	Typical cost	What the range covers	Reported by
Water heater repair, typical job	$228 to $1,017	Typical water heater repair; the heater type and the part that failed set the price. The same source puts water heater replacement at $875 to $1,800 and notes tank heaters last about 10 to 15 years.	HomeAdvisor (Jun 2026) US national
Electric thermostat replacement	$150 to $200	Professional replacement of a thermostat on an electric water heater; the part itself costs about $20. Each heating element has its own thermostat.	HomeAdvisor (Jun 2026) US national
Electric heating element replacement	$200 to $300	Professional replacement of a heating element in an electric water heater, which has an upper and a lower element.	HomeAdvisor (Jun 2026) US national
Pressure relief valve replacement	$20 to $200	Replacing a water heater’s pressure relief valve; the source table labels this range as including labor.	HomeAdvisor (Jun 2026) US national
Gas control valve replacement	$150 to $500	Replacing a faulty gas control valve on a gas water heater, which the source calls a common repair.	HomeAdvisor (Jun 2026) US national
Thermocouple replacement	$150 to $325	Replacing the thermocouple on a gas water heater (the sensor that lets the gas valve open when the pilot is lit), parts and labor.	Fixr (Aug 2025) US national
Tank water heater replacement, installed	$600 to $2,500	Tank-style water heater including installation; tank size, fuel type and brand drive the price. Permits, venting changes, haul-away of the old unit and fuel conversions can add to the total.	Fixr (Jan 2026) US national
Tankless water heater, installed	$1,406 to $3,901	Installed tankless water heater; fuel source (electric, natural gas, propane or solar) and flow rate drive the price. Building permits and any gas line, venting or electrical upgrades are extra.	HomeAdvisor (Jun 2026) US national

Market ranges, not quotes from Speedy Plumbing Baltimore. Sources: HomeAdvisor: How Much Does a Water Heater Repair Cost in 2025? (https://www.homeadvisor.com/cost/plumbing/repair-a-water-heater/) (updated Jun 2026); HomeAdvisor: How Much Does a Water Heater Replacement Cost in 2025? (https://www.homeadvisor.com/cost/plumbing/install-a-water-heater/) (updated Jun 2026); Fixr: How much does it cost to repair a water heater? (https://www.fixr.com/costs/water-heater-repair) (updated Aug 2025); Fixr: How Much Does It Cost to Install a Water Heater? [2026 Data] (https://www.fixr.com/costs/install-water-heater) (updated Jan 2026); HomeAdvisor: How Much Does a Tankless Water Heater Cost in 2025? (https://www.homeadvisor.com/cost/plumbing/install-a-tankless-water-heater/) (updated Jun 2026). Retrieved 2026-09-13.

Tankless repair figure: HomeAdvisor: How Much Does Tankless Water Heater Repair Cost? (https://www.homeadvisor.com/cost/plumbing/tankless-water-heater-repair-cost/) (updated Jun 2026). Retrieved 2026-10-19. The Fixr comparison figure is from Fixr: Cost to Repair Tankless Water Heater (https://www.fixr.com/costs/tankless-water-heater-repair) (updated Jan 2025).

Reading the ranges

The relief valve figures disagree. HomeAdvisor (Jun 2026) lists $20 to $200 including labor, yet the same publisher’s plumber cost guide puts a service call alone at $100 to $250 per visit. Fixr’s repair guide puts a replacement at about $100 to $250, though Fixr’s description confuses the relief valve with a pressure-reducing valve.
HomeAdvisor’s heating element figure does not say whether it covers one element or both, and Fixr’s element range runs from $200 to $750.
Published replacement ranges leave out local permit fees; the Baltimore City and County fees are listed under water heater permits.

Hot water heater repair questions

Is a leaking water heater an emergency?

Yes. A. O. Smith says a leaking water heater needs immediate action: switch off the breaker for an electric model or close the gas shut-off valve for a gas model, then close the shutoff valve on the cold water line. Leave any repair until both the power and the water are disconnected.

Can a leaking hot water tank be repaired?

Usually not when the water comes from the tank itself. A. O. Smith says a leak at the base often signals a corroded tank that is more practical to replace, and that every tank eventually leaks from normal corrosion. Leaks at the top fittings or from the relief valve on the side come from parts rather than the tank.

Who repairs hot water heaters in Baltimore?

Maryland’s State Board of Plumbing licenses plumbing and natural gas work in Baltimore City, while Baltimore County’s own Plumbing and Gasfitting Board licenses both trades there. Speedy Plumbing Baltimore connects callers with licensed contractors for the water and gas sides.

Why does the relief valve on my water heater drip now and then?

Periodic discharge may come from thermal expansion in a closed water system. A. O. Smith and Rheem both recommend a thermal expansion tank, and Rheem says a new relief valve will not solve the problem. Never plug or cap the valve or its discharge pipe.

Do I need a permit to replace a water heater in Baltimore?

Yes. Baltimore City treats a water heater replacement as trade-permit work for a licensed contractor, with a $20 fee for an electric heater or $30 for a gas-fired unit up to 200,000 BTU per hour, plus a $25 application fee for a 1- or 2-family home. Baltimore County says all plumbing and gasfitting work needs a permit and inspection, and its code names replacement as permit work.

How long does a tank water heater last?

A Department of Energy page archived in 2026, and since removed, put storage tank water heaters at 10 to 15 years. A. O. Smith gives a wider 8 to 20 years depending on the type, and says an old heater that starts leaking is usually more cost-effective to replace than to repair.

How often does a tankless water heater need flushing?

Once a year in a home with hard water. Rinnai and Navien manuals set annual flushing for moderately to very hard water, Noritz recommends flushing and descaling every year, and Rinnai says soft water needs no flushing schedule. Rinnai warns that scale left in place damages the heat exchanger and is not covered by its warranty.

How much does it cost to repair a water heater?

HomeAdvisor (Jun 2026) reports most water heater repairs at $228 to $1,017 nationally, with an average of $615. Fixr’s repair guide gives a lower range of $150 to $750. An installed tank water heater replacement runs $600 to $2,500, according to Fixr (Jan 2026).

How much does tankless water heater repair cost?

HomeAdvisor (Jun 2026) puts a tankless water heater repair at $75 to $1,300 nationally, with an average of $600. Fixr’s older page, updated January 2025, gives $100 to $650. The part that failed sets the price.

Water heater leaking right now?

Turn off its power or gas, close the cold water valve and call to be connected with a local plumber. The phone is answered 24 hours a day.