Water Heater Warranties: What's Actually Covered

By the Hot Water NJ Team · Updated January 19, 2026 · 6 min read

A '12-year warranty' rarely means what buyers think. Here's how water heater warranties actually work—and how not to void yours.

Water heater warranties sound reassuring—'6-year,' '10-year,' '12-year'—but the fine print matters enormously. Knowing what's actually covered, and what quietly voids coverage, can save you a costly surprise.

What the years actually mean

The headline number usually refers to the tank (against leaks) and may differ from the parts warranty. A '12-year' unit might cover the tank for 12 years but parts for less. Always read which components each term covers.

What's typically covered

• The tank itself against manufacturing defects / leaks
• Specific parts (elements, valves) for a stated period
• Sometimes a longer term if you register the unit

What's usually NOT covered

• Labor to remove and replace (often a big out-of-pocket cost)
• Damage from lack of maintenance
• Failures from improper installation
• Damage from hard water if maintenance was skipped
• Consequential damage (e.g., water damage from a leak)

What voids a warranty

• Installation by an unlicensed/non-professional installer
• Skipping required maintenance like flushing
• No expansion tank where code requires one
• Modifications or improper operating conditions
• Failing to register the unit when required

How to protect your coverage

1. Have it professionally installed by a licensed plumber
2. Keep up with annual maintenance and document it
3. Register the unit with the manufacturer
4. Add an expansion tank where required
5. Keep your receipts and service records

We help you keep coverage valid

A proper professional installation plus documented annual maintenance keeps your warranty intact—and gives you the records you'll need if you ever claim. Call 973-834-8833.