No hot water
Electric units may have a failed heating element, breaker, thermostat, or wiring issue. Gas units may have an ignition, pilot, gas-supply, thermocouple, or control problem.
Water heater help
No hot water, a leaking tank, or strange noises? Find out what may be wrong.
Water heaters can fail gradually or all at once. Some problems involve a thermostat, heating element, valve, ignition system, or sediment buildup. Others may indicate a corroded tank that is nearing the end of its useful life. California Water Help can help connect you with an independent plumbing professional serving your area.
☎ Call (866) 227-6805
Availability varies by area and provider
Tank and tanklessGas and electric systems
Repair or replacementDiscuss the likely next step
Independent providersConfirm pricing and credentials directly
Common warning signs
Water heater problems often give clues before a complete failure
Some symptoms are caused by a replaceable component. Others may point to age, corrosion, heavy sediment, installation issues, or a tank that can no longer safely hold water.
Not enough hot water
A thermostat setting, failed lower heating element, sediment buildup, undersized tank, damaged dip tube, or unusually high household demand may reduce available hot water.
Leaking water heater
Leaks may come from a fitting, valve, drain connection, temperature-and-pressure relief line, or the tank itself. Tank leaks often indicate internal corrosion.
Rumbling or popping noises
Heated water moving through sediment can create popping, crackling, or rumbling sounds. Heavy buildup may reduce efficiency and strain the tank.
Rust-colored hot water
Discoloration may involve corrosion in the tank, anode rod deterioration, iron in the water supply, or rust in nearby piping. Comparing hot and cold water can help narrow the source.
Water is too hot
A thermostat setting or control failure may cause dangerously high temperatures. Scalding water should be addressed promptly, especially in homes with children or older adults.
When a leak is urgent
Water around the unit deserves attention
A small amount of condensation can look different from an active plumbing leak. Check whether water appears near a connection, valve, drain line, pan, or the tank body. Do not touch electrical components or attempt gas work.
- Water is spreading across the floor. If safe, shut off the cold-water supply to the unit and call for guidance.
- The tank body is leaking. This often indicates internal corrosion and may require replacement.
- The relief valve is discharging. Excess temperature, pressure, thermal expansion, or a faulty valve may be involved.
- There is water near wiring or controls. Keep clear and shut off power only if it can be done safely at the breaker.
- You smell gas. Leave the area and contact the gas utility or emergency authority. Do not use switches or flames.
Important safety note
Water heaters combine hot water, pressure, electricity, or combustible gas. Do not bypass safety controls, cap a relief valve, relight equipment if you smell gas, or attempt repairs beyond your training.
California Water Help is a referral website, not a public-safety emergency service. For gas odors, fire, electrical hazards, or life-threatening conditions, contact the appropriate utility or emergency authority.
Tank versus tankless
Different systems have different strengths, limitations, and service needs
The right choice depends on household demand, fuel availability, installation conditions, budget, energy goals, and long-term maintenance expectations.
| Consideration | Conventional Tank | Tankless |
|---|---|---|
| How it works | Stores and maintains a set volume of hot water. | Heats water as it flows through the unit. |
| Hot-water supply | Limited by tank capacity and recovery rate. | Can provide extended hot water within the unit's flow-rate limits. |
| Upfront installation | Often simpler when replacing a similar existing unit. | May require gas-line, venting, electrical, or plumbing upgrades. |
| Space | Requires floor space for the tank. | Usually wall-mounted and more compact. |
| Maintenance | Periodic inspection and flushing may be recommended. | Descaling and filter maintenance may be especially important in hard-water areas. |
| Common concerns | Tank corrosion, sediment, element or burner issues, and leaks. | Scale buildup, flow-sensor issues, ignition errors, and capacity limitations. |
Need help with a water heater problem?
Describe the symptoms and ask about service availability.
Your call may be connected with an independent plumbing professional serving your area.
Repair or replace?
Age is only one part of the decision
A qualified provider may consider the source of the problem, equipment age, repair history, corrosion, energy use, parts availability, installation condition, and the cost of repair compared with replacement.
Repair may make sense when
The tank is sound, the unit is not near the end of its expected life, and the issue involves a replaceable valve, thermostat, element, burner component, or connection.
Replacement may make sense when
The tank itself leaks, corrosion is advanced, repair costs are high, failures are frequent, efficiency is poor, or the unit no longer meets household needs.
Ask for a written comparison
Request the repair price, replacement options, warranty terms, expected service life, permit requirements, disposal charges, and any needed code upgrades.
California water conditions
Hard water can increase maintenance needs
Many California communities experience moderate to hard water. Calcium and magnesium can form scale inside tanks, on heating elements, in valves, and within tankless heat exchangers.
Scale may reduce heat transfer, increase noise, contribute to longer heating cycles, and restrict passages. The rate of buildup varies by water quality, temperature, usage, and system design.
Ask the manufacturer or a qualified provider about appropriate flushing, descaling, filtration, or water-treatment options. Maintenance should follow the specific unit's instructions rather than a one-size-fits-all schedule.
California installation considerations
Permits and safety requirements may apply
Water heater replacement can involve local permit, venting, combustion-air, seismic-strapping, drain-pan, relief-line, gas-connector, electrical, expansion-control, or energy-code requirements.
Requirements can vary by city, property type, fuel source, installation location, and the scope of work. Ask the provider who will obtain permits, whether an inspection is required, and which upgrades are included in the estimate.
Homeowner responsibility:
Verify the contractor's identity, license, insurance, written estimate, warranty, and permit responsibilities before authorizing work.
Maintenance and prevention
Simple checks may help reveal problems earlier
Maintenance needs differ by model and manufacturer, but homeowners can watch for changes in performance and keep the area around the unit accessible.
Look for moisture
Periodically check the tank, fittings, valves, drain pan, and nearby floor for water, rust, or mineral tracks.
Notice changes in sound
New popping, rumbling, sizzling, or hammering sounds can be useful clues when describing the problem.
Monitor hot-water performance
Pay attention if recovery slows, temperature changes, or hot water runs out sooner than before.
Keep the area clear
Do not store flammable or heat-sensitive materials around gas water heaters or block access to shutoffs and controls.
Follow manufacturer guidance
Use the model-specific manual for inspection, flushing, descaling, filter care, and service intervals.
Know the unit's age
Record the model, serial number, installation date, warranty, and service history so you can make a better repair-or-replace decision.
Helpful Homeowner Guide
Complete Water Heater Guide
Our Complete Water Heater Guide covers common symptoms, tank and tankless systems, maintenance, and repair-versus-replacement considerations.
Browse more practical resources in the California Water Help Learning Center.
Frequently asked questions
Questions homeowners ask about water heater repair
Clear information can help you explain the problem and evaluate the options presented by an independent provider.
Is California Water Help a plumbing company?+
No. California Water Help is an independent marketing and referral website. We do not directly perform, supervise, endorse, or guarantee plumbing work.
Why is my water heater not producing hot water?+
Possible causes include a failed element, thermostat, ignition system, pilot, gas or power interruption, control issue, heavy sediment, or an undersized unit.
Why does my hot water run out so quickly?+
Possible causes include increased household demand, a failed lower element, sediment reducing usable tank volume, a damaged dip tube, thermostat issues, or a unit that is too small.
Is a leaking water heater an emergency?+
An active or spreading leak should be addressed promptly. Keep clear of electrical components, and shut off water or energy only when it can be done safely.
Can a leaking water heater be repaired?+
A leaking valve, fitting, drain connection, or relief line may be repairable. A leak through the tank body often indicates internal corrosion and usually requires replacement.
Why is my water heater making popping noises?+
Sediment can trap water near the heat source, producing popping or rumbling as the water moves through the buildup. Other mechanical or combustion issues may also create noise.
How long does a conventional water heater last?+
Many tank units last roughly 8 to 12 years, but actual life varies by model, installation, water quality, maintenance, usage, location, and operating conditions.
How long does a tankless water heater last?+
Some tankless units can operate longer than conventional tanks when correctly sized, installed, and maintained. Scale, water quality, usage, and service history strongly affect longevity.
Should I choose gas or electric?+
The answer depends on local utility rates, existing connections, electrical capacity, venting, installation cost, recovery needs, efficiency goals, and household demand.
Should I replace a tank unit with tankless?+
Tankless may save space and provide extended hot water, but conversion can require gas, venting, plumbing, or electrical upgrades. Ask for a complete installed-cost comparison.
Can hard water damage a water heater?+
Mineral scale can reduce heat transfer, collect in tanks and heat exchangers, restrict passages, and increase maintenance needs. The effect varies by local water quality and system design.
Why is my hot water rusty or discolored?+
Possible causes include tank corrosion, anode-rod deterioration, iron in the water supply, sediment, or nearby piping. Comparing hot and cold water can help identify whether the issue is limited to the heater.
What does the temperature-and-pressure relief valve do?+
It is a critical safety device designed to relieve excessive temperature or pressure. Never cap, plug, or disable it. Discharge from the valve should be evaluated.
How much does water heater repair cost?+
Pricing varies by provider, diagnosis, unit type, fuel source, parts, access, labor, permits, and whether replacement is required. Confirm all fees before authorizing work.
How should I verify a contractor?+
Ask for the full legal business name and license number. Verify licensing through the appropriate California authority and ask about insurance, permits, written estimates, warranties, and service terms.
Related resources
Continue exploring plumbing help
Ready to talk?
Tell a representative what your water heater is doing.
Ask whether an independent plumbing professional is available in your area.