Water Heater Repair Costs
Updated February 20, 2026
When your water heater acts up, the first question is always: fix it or replace it? Most repairs are straightforward and affordable. But some repairs on an aging unit are throwing money at a problem that's about to get worse. Here's what each common repair actually costs, so you can make a smart call.
Overview
When your water heater acts up, the first question is always: fix it or replace it? Most repairs are straightforward and affordable. But some repairs on an aging unit are throwing money at a problem that's about to get worse. Here's what each common repair actually costs, so you can make a smart call.
Cost Breakdown
Pro Tips
- Get the repair quote in writing before approving the work. Ask for parts and labor broken out separately.
- If a plumber recommends replacement, ask specifically why and what the repair alternative would cost. An honest plumber will give you both options.
- DIY repairs on gas appliances require caution. If you smell gas at any point, stop, ventilate, and call the gas company.
- Keep repair receipts. If you repair a heater multiple times in a short period, the pattern tells you it's time to replace.
Mistakes to Avoid
- Spending $400 on a gas valve for a 10-year-old heater that has 2-3 years left.
- Paying a plumber to diagnose a problem that's just a tripped reset button or a blown thermocouple.
- Not getting a second opinion on expensive repairs, especially from plumbers who also sell replacement units.
- Replacing a whole water heater because of a $15 thermocouple -- learn the basic fixes first.
When to Call a Pro
Any repair involving gas lines, venting modifications, or electrical work beyond basic element replacement should be done by a licensed professional. If the water heater is under warranty, contact the manufacturer first -- most have 6-12 year tank warranties and 1-2 year parts warranties.
Bottom Line
Most water heater repairs cost $15-$50 DIY or $100-$400 with a plumber. Use the 50% rule: if the repair costs more than half a new unit, or the heater is past 8 years old and needs significant work, replacement is the smarter investment.