A standard tank water heater replacement runs $800–$1,500 fully installed. Tankless runs $2,000–$4,000. Most home warranty plans cover water heaters in their base plan - but sediment-caused failures and corrosion-related failures are excluded by most companies, creating a real claim risk for older units and homes in hard-water or coastal areas.
What Water Heater Coverage Includes
Covered
- Heating element failure (electric)
- Gas valve failure (gas water heater)
- Thermostat and temperature controls
- Full replacement when repair isn't feasible
- Labor to remove and install
Not Covered (Most Plans)
- Sediment buildup failure (most plans - AHS exception)
- Rust and corrosion (most plans - AHS covers it)
- Code-required energy upgrade (larger tank, heat pump WH)
- Expansion tanks (check local code requirements)
- Pre-existing leaks or underperformance
- Tankless descaling neglect in hard water areas
The Sediment Exclusion - Why It Matters
How the denial happens
A technician opens a water heater and sees sediment buildup on the bottom of the tank or heating element. Most warranty contracts let them attribute the failure to "lack of maintenance" - specifically, failure to flush the tank annually. The claim is denied even if the heating element itself failed for unrelated reasons.
How to protect yourself: Flush your water heater tank annually - 15 minutes of work that removes sediment, improves efficiency, and eliminates a warranty denial trigger. Keep a note of the date. If you haven't been flushing and your unit is older, AHS's explicit sediment coverage is a meaningful differentiator.
Tankless Water Heater Coverage
Standard tank replacement
$800–$1,500
Typical $500–$1,500 cap is adequate for most standard replacements.
Tankless replacement
$2,000–$4,000
Often exceeds standard caps. Verify your plan's tankless-specific cap before purchasing.
Tankless units require annual descaling in hard water areas. Mineral buildup can clog the heat exchanger and reduce efficiency before causing outright failure. If you skip descaling in a hard water area and the unit fails, a technician report noting scale buildup gives the company grounds to deny as a maintenance failure.
Document your annual descaling service. If you hire a plumber to do it, keep the invoice.
Company Comparison: Water Heater Coverage
Covers sediment failure AND rust/corrosion - broadest water heater coverage among major companies
Reimbursement schedule-based - no hard cap, but schedule rates may not match replacement costs
Standard water heater coverage; A.M. Best A+ financial backing
Standard coverage; sediment and corrosion excluded
When to File a Claim (and When Not To)
File a claim
- No hot water produced
- Active leak from the tank body (not condensation)
- Pilot light won't stay lit after relighting
- Mechanical failure signs (hissing, banging, tripping breaker)
Don't file - handle yourself
- Pilot light needs relighting (try the manual first)
- Pressure relief valve testing (maintenance item)
- Routine sediment flushing
- Anode rod inspection (maintenance)