Quick answer
Replace a water heater when the tank itself leaks, when it is near the end of its roughly 10 to 15 year life, when only the hot water is rusty, or when a repair costs half or more of a new one. Leaks at fittings or valves, a dripping relief valve, a pilot that will not stay lit or a failed electric element are repairs, typically $100–$400. A replacement, installed, runs $900–$4,500 by type. Call (888) 217-6781 to reach a plumbing company taking calls in your ZIP.
Follow the short menu, then your 5-digit ZIP. The line goes quiet for a few seconds while it connects; stay on. If it does not connect, call once more: companies taking calls change minute to minute.
Written & reviewed by Marcus ReedIICRC WRT
Reviewed November 4, 2026· Next review May 2027
Whether to repair or replace a water heater comes down to three things: where it is failing, how old it is, and what the repair costs against a new one. A leaking tank is the one case where there is no real choice.
When Replacement Is the Answer
- The tank itself is leaking. Water from the tank body or the bottom seam (not from a fitting or the valves) means the steel inside has corroded through. Tanks cannot be patched. See water heater leaking from the top or bottom.
- It is near the end of its life. The U.S. Department of Energy puts the life of a tank water heater at roughly 10 to 15 years. The age is in the serial number on the label; the manufacturer's site decodes it.
- Rusty hot water only. Rust in the hot water but not the cold points to the inside of the tank.
- The repair costs half or more of a new heater on a unit past the middle of its life.
When a Repair Makes Sense
| Problem | Usual repair |
|---|---|
| Leak at a pipe fitting or the drain valve | Tighten or replace the fitting or valve |
| Relief valve dripping | Replace the temperature and pressure relief valve, check the pressure |
| Pilot will not stay lit | Thermocouple; see pilot won't stay lit |
| No hot water on an electric heater | Heating element or thermostat |
| Popping or rumbling | Flush the sediment; see water heater making noise |
Talk to a plumber about this
One call reaches a plumbing company taking calls in your ZIP.
What Each Costs
A valve or fitting repair runs $100–$400. A replacement, installed, runs $900–$4,500 depending on type: about $800–$1,600 for an electric tank, $900–$1,800 for a 40 to 50 gallon gas tank, and $2,000–$4,500 for gas tankless. Gas line or venting changes add $500–$1,500. See water heater repair and water heater installation.
When to Call
Call right away for a leaking tank: turn off the cold water inlet valve and the power or gas first. For anything else, have the brand, the age from the label and what you are seeing ready. (888) 217-6781 connects you to a plumbing company taking calls in your ZIP. Follow the short menu, enter your 5-digit ZIP and stay on while it connects; if it does not connect, call once more, because the companies taking calls change minute to minute.
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Frequently Asked Questions
Should I repair or replace my water heater?
Replace it if the tank itself leaks, it is near the end of its 10 to 15 year life, or the repair costs half or more of a new one. Valves, fittings, elements and thermocouples are repairs.
Can a leaking water heater tank be repaired?
NoWater from the tank body or bottom seam means the steel has corroded through, and the heater needs replacing.
How much does it cost to replace a water heater?
A replacement, installed, runs $900–$4,500 by type: about $800–$1,600 for an electric tank, $900–$1,800 for a 40 to 50 gallon gas tank and $2,000–$4,500 for gas tankless.
Sources
Methodology: How we source and verify data · Report an error
Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.