Water Heater: Repair or Replace? A 2026 Guide

Lifespan first

A standard tank water heater lasts 8–12 years. A tankless lasts 15–20. Find the date on the rating plate — the first two digits of the serial number are usually the year of manufacture.

Repair vs replace by symptom

• No hot water — bad heating element ($200–$400) or gas thermocouple ($150–$300). Worth repairing on a young tank.
• Pilot won't stay lit — thermocouple. $150–$300.
• Popping or rumbling — sediment buildup. Flush ($150) if under 8 years; otherwise replace.
• Rusty hot water — anode rod gone, tank rusting. Replace.
• Leaking from the tank itself — replace immediately. Drips become floods.
• Top-of-tank leak — usually a fitting. Repair.

Replacement cost in 2026

• 40-gal gas tank, builder-grade: $1,400–$2,400 installed
• 50-gal electric: $1,500–$2,600
• Power-vent gas (no chimney): $2,200–$3,800
• Tankless gas (whole house): $4,000–$7,500 installed
• Heat pump water heater (Energy Star): $3,200–$5,500 (federal tax credit up to $2,000)

Why permits matter

Code requires expansion tanks, drip pans, dielectric unions, sediment traps on gas lines, and proper venting. An unpermitted swap is a common reason home-inspection deals fall apart later.

When tankless wins

You go tankless if (a) hot water demand from two showers + a dishwasher overlaps, (b) you have natural gas with adequate line size, and (c) you plan to stay 8+ years for the energy savings to pay back.