Water Heater Repair Guide

Water heaters fail predictably. No hot water is usually a $15 thermocouple or pilot issue. Leaking from the tank itself means it's time to replace.

Avg Lifespan

8-12 years

Replace Cost

$500-2,000

Common Fixes

3 problems

Common Problems

90% likely easy 20-30 minutes

No Hot Water

Water runs cold or only lukewarm from all taps

Cause: Failed thermocouple (gas) or tripped breaker/element (electric)

Parts from

$12

See Fix →

60% likely medium 20-30 minutes

Leaking from Tank

Water pooling under or around the water heater

Cause: Corroded tank, loose drain valve, or T&P valve leaking

Parts from

$10

See Fix →

50% likely easy 30-45 minutes

Popping or Rumbling Noise

Water heater makes popping, rumbling, or banging sounds when heating

Cause: Sediment buildup in the tank

See Fix →

Is It Worth Fixing?

A water heater replacement costs $500-2,000. Most common repairs cost $10-50 in parts. If your unit is less than 8-12 years old, repairing it is almost always the better financial decision. Even if you're not comfortable with DIY repairs, a service call ($100-200) plus parts is still cheaper than replacing the entire unit.

When to replace: If the unit is past its expected lifespan, has had multiple failures, or the compressor/motor needs replacing (these are expensive components that signal end-of-life).

Brands We Cover

RheemAO SmithBradford WhiteGEWhirlpool

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Frequently Asked Questions

How long does a water heater typically last?

A typical water heater lasts 8-12 years. With regular maintenance, many last even longer. If yours is approaching the end of its expected lifespan and a major component fails (compressor, motor), replacement may be more cost-effective.

Is it worth repairing a water heater or should I replace it?

If the repair costs less than 50% of a new water heater ($500-2,000) and the unit is under 75% of its expected lifespan (8-12 years), repair is usually the better choice. Most common water heater repairs cost $10-50 in parts.

Can I fix a water heater myself?

2 of 3 common water heater problems are rated "easy" and can be fixed by most homeowners with basic tools (screwdriver, multimeter). Always disconnect power before starting any repair.

What tools do I need to repair a water heater?

Most water heater repairs require a multi-bit screwdriver, adjustable wrench, and multimeter. Total tool investment: under $50. We list the specific tools needed for each repair in our guides.