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Quick, low-risk steps

  1. If there is a gas odor, CO alarm, smoke, or water near electricity, evacuate and call 911 or the gas utility.
  2. For a large leak, shut off the cold-water supply valve to the heater and, if safe, turn off power at the breaker or gas valve.
  3. Record the water heater's model, fuel type, age (from the serial number), and where the leak or problem is located.
  4. List your household's simultaneous hot-water needs (showers, appliances) to discuss sizing with a pro.
  5. Ask a licensed plumber to inspect and provide repair and replacement options with a written scope of work.

Safety and Emergency Situations

Some water heater problems are emergencies. If you smell gas, hear a carbon monoxide alarm, see smoke or scorching, or have water contacting electrical equipment, leave the home immediately and call 911 or your utility. Do not try to fix these issues yourself.

For a large, uncontrolled water leak, shut off the cold-water supply valve to the heater. If safe, turn off the power at the circuit breaker for electric models or turn the gas control valve to 'off' for gas models. Then call a licensed plumber.

  • Gas odor or CO alarm: evacuate and call 911 or gas utility
  • Water near outlets or wiring: do not touch; shut off power at main breaker if safe
  • Smoke or scorching: evacuate and call 911
  • Large leak: shut off cold-water supply and, if safe, turn off energy source

Age and Condition of Your Water Heater

The age of your water heater is a key factor. Most tank-style water heaters have a limited lifespan. If your unit is older and has a major leak or rust, replacement is often the safer and more cost-effective choice. A professional can check the serial number to determine the exact age.

Even if the tank isn't leaking, internal corrosion or sediment buildup can reduce efficiency and lead to future problems. A plumber can assess the condition of the anode rod, tank lining, and heating elements to help you decide.

  • Check the serial number for the manufacturing date
  • Rust-colored water or a leaking tank often means replacement is needed
  • Ask a pro to inspect the anode rod and tank interior
  • Consider replacement if the unit is beyond its typical lifespan

Efficiency and Energy Costs

Newer water heaters are generally more energy-efficient than older models. If your current unit is old, upgrading to a high-efficiency model could lower your utility bills. Heat pump water heaters, for example, can be more efficient than standard electric models, but site conditions and current rates matter.

A professional can help you compare the long-term operating costs of repair versus replacement. They can also explain available rebates or tax credits that may reduce the upfront cost of a new, efficient unit.

  • Older units may cost more to run due to lower efficiency
  • Heat pump water heaters can offer savings, but need proper installation space
  • Ask about ENERGY STAR certified models and local rebates
  • Compare estimated annual energy costs for repair vs. replacement

Cost Considerations and Getting Quotes

Repair costs can vary widely. A simple part replacement might be affordable, but a major fix like a tank leak or heat exchanger failure could approach the cost of a new unit. Get a detailed written estimate for both repair and replacement options.

When comparing quotes, ask about the full scope of work: equipment and capacity, fuel or energy source, removal and disposal, permit and inspection, gas line or electrical circuit, venting or condensate, pan drain and shutoffs, expansion control, commissioning, labor, and warranty. This helps you make an apples-to-apples comparison.

  • Get a written estimate for repair and a separate quote for replacement
  • Ask what's included: permits, disposal, warranty, and any needed upgrades
  • Consider long-term savings from a more efficient new unit
  • Check your homeowner's insurance policy for possible coverage, but don't assume it will pay

Take this with you

Evidence and scope checklist

  • Equipment and capacity
  • Fuel or energy source
  • Removal and disposal
  • Permit and inspection
  • Gas line or electrical circuit
  • Venting or condensate
  • Pan drain and shutoffs
  • Expansion control
  • Commissioning
  • Labor and warranty
Open the interactive private worksheet →

Common questions

What homeowners ask next

Is a leaking water heater always a replacement?

Not always. A leak from a fitting or valve may be repairable, but a leak from the tank itself usually means replacement is needed. A professional can determine the source.

How do I know if my water heater is too old?

Check the serial number for the manufacture date. A plumber can help. If it's beyond the typical lifespan for its type and has problems, replacement is often recommended.

Will my insurance cover a water heater replacement?

It depends on your policy and the cause of damage. Contact your insurance company to ask about coverage. Do not assume it will pay.

Evidence

Sources used for this guide

Research checked July 31, 2026

Optional next step

Need an on-site professional?

Use the guide and worksheet first so you can describe the situation and compare the full scope. A referral is optional; you can also contact a licensed local provider directly.

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We have not enabled a provider route for this site. Use the checklist to contact and verify local providers yourself; urgent hazards should go to the appropriate emergency or public service.