Water Heater Warranty Replacement Cost
Water heater warranties run 6 to 12 years on the tank, prorated on parts, and almost never cover labour past year 1. A warranty replacement saves $700 to $1,000 in out-of-pocket costs versus full replacement. Here is what is covered, what voids the coverage, and the registration deadline you do not want to miss.
Standard warranty terms by tier
| Tier | Example models | Tank warranty | Parts warranty | Labour warranty |
|---|---|---|---|---|
| Economy | Rheem Performance, AO Smith Signature 100 | 6 years | 6 years prorated | 1 year |
| Mid-tier | Rheem Performance Plus, AO Smith Signature Select | 9 years | 9 years prorated | 1 year |
| Premium | Rheem Performance Platinum, AO Smith ProLine XE | 12 years | 5 years | 1 year |
| Bradford White M-I | M-I Defender, Magnum series | 6 years | 6 years | 1 year |
| Bradford White RG2 (premium) | RG2 series, Magnum 75 to 80 gal | 10 years | 5 years | 1 year |
| Heat pump (Rheem ProTerra) | Rheem ProTerra, AO Smith Voltex | 10 years | 10 years on compressor | 1 year |
| Tankless gas (Rinnai, Navien) | Rinnai RU series, Navien NPE series | n/a | Heat exchanger 12 yrs, parts 5 yrs | 1 year (Rinnai installer extends to 3-5) |
Manufacturer warranty terms from Rheem, AO Smith, Bradford White. Specific terms vary by model and region; verify with your dealer at purchase. Snapshot April 2026.
What "prorated" actually means
The word "prorated" on a parts warranty is one of the more confusing terms in manufacturer paperwork. It means the manufacturer's reimbursement decreases over time even if the part is technically still under warranty. For example: a 9 year prorated parts warranty might cover 100 percent in years 1 to 3, 80 percent in years 4 to 5, 60 percent in years 6 to 7, and 40 percent in years 8 to 9. The same part that would be a free replacement at year 2 might be a $150 part-cost-contribution at year 7.
The tank itself on most consumer-grade units is straight (non-prorated) for the warranty term. So a 9 year tank warranty pays for the tank replacement at any point in those 9 years, 100 percent. The labour to install is the homeowner's problem after year 1. Premium units (Bradford White, AO Smith ProLine XE, some Rheem Platinum) have non-prorated parts warranties; check the specific document.
Practical implication: when a unit fails in year 5 to 8 and the warranty has "prorated" parts, expect to pay $50 to $200 in part-cost-contribution on top of the labour. Still cheaper than full replacement at $1,200 to $2,500 but not free.
The warranty replacement cost math
| Scenario | Tank cost | Labour | Haul-away | Code upgrades | Total OOP | vs full replace |
|---|---|---|---|---|---|---|
| Year 2, 50 gal gas under 9 yr warranty | $0 | $400-$700 | $0-$50 | $0 | $400-$750 | Save $600-$1,500 |
| Year 5, 50 gal gas under 9 yr warranty | $0 (prorated 80%) | $400-$800 | $50-$100 | $0-$200 | $450-$1,100 | Save $400-$1,200 |
| Year 8, 50 gal gas under 9 yr warranty (60% prorated) | $80-$200 | $400-$900 | $50-$150 | $0-$300 | $530-$1,550 | Save $200-$900 |
| Year 4 HPWH under 10 yr warranty | $0 | $500-$900 | $75-$150 (refrigerant) | $0-$200 | $575-$1,250 | Save $1,500-$3,000 |
| Out of warranty (10 yr unit, year 11) | n/a | n/a | n/a | n/a | $1,000-$2,500 full replace | n/a |
The warranty claim process step by step
- Identify the unit. Locate the data plate (the metal label, usually on the side or top of the unit). Note the model number, serial number, and date of manufacture.
- Locate your install paperwork. Permit paperwork from the original install is the strongest proof of install date. The installer's invoice is the next-best. If you don't have either, the manufacturer uses the date-of-manufacture on the data plate, which may be slightly later than install date and may shorten effective warranty.
- Verify warranty registration. Many manufacturers require registration within 30 to 90 days of install for full warranty. Log into the manufacturer's website with serial number to check registration status. Register late if needed; some manufacturers accept it with reduced terms.
- Call the warranty support line. Each manufacturer has a residential warranty support phone line (Rheem 1-800-621-5622, AO Smith 1-800-433-2545, Bradford White through your installer). Provide the unit details and describe the failure. The agent confirms warranty coverage and issues a warranty claim number.
- Get the replacement unit. For standard residential tank units, the manufacturer typically directs you to a local plumbing distributor or your installer to pick up the warranty replacement unit. Some HPWH units may be shipped direct.
- Schedule the labour. Your original installer is often willing to do the warranty swap at standard rates. Independent plumber labour rates of $400 to $900 apply.
- Document everything. Keep the warranty claim number, photos of the failed unit, and the new install paperwork. The new unit's warranty starts fresh on install date; register the new unit too.
Frequently asked questions
What is the standard water heater warranty term?
Standard residential water heater warranties run 6 to 12 years on the tank itself, plus 1 year on labour. The terms vary by model tier: economy units (Rheem Performance, AO Smith Signature 100) carry 6 year tank, premium units (Rheem Performance Plus, AO Smith Signature Premier) carry 9 year tank, and premium plus units (Rheem Performance Platinum, AO Smith ProLine XE, Bradford White) carry 12 year tank. Parts beyond the tank (controls, elements, thermostats, gas valves) typically have shorter coverage of 1 to 5 years.
Does the warranty cover labour to replace the tank?
Manufacturer warranty almost never covers labour beyond the first year. If your 5 year old tank fails under the 9 year warranty, the manufacturer replaces the tank itself at no cost, but you pay the plumber for labour to install the warranty replacement. Labour for a warranty swap typically runs $400 to $900, similar to standard install labour. Some retailer bundled installs (Home Depot extended labour warranty, Lowes extended protection) cover labour for an extra 3 to 5 years at $80 to $250 add-on cost.
Do I need to register the warranty to keep it valid?
Most manufacturers require warranty registration within 30 to 90 days of installation to maintain full warranty terms. Failure to register may shorten the warranty by 1 to 3 years on the tank and may void some labour coverage. Registration is online (rheem.com, hotwater.com for AO Smith, bradfordwhite.com) and takes 5 minutes. You need the model number, serial number, and install date. The plumber sometimes handles this; if not, the homeowner should.
What voids the manufacturer warranty?
Common warranty-voiding actions: install by an unlicensed installer (most warranties require licensed plumber install with documented permit), failure to install a code-required expansion tank, operating the unit above the maximum temperature setting, use of water with chloride levels above the manufacturer threshold (typically 500 ppm), failure to perform documented annual maintenance, and modification or alteration of the unit. Hard-water-induced sediment buildup is usually not warranty-covered because the manufacturer considers it a maintenance issue. Anode rod consumption is also not warranty-covered.
How much does a warranty replacement actually cost out of pocket?
Tank replacement under warranty: the tank itself is provided free by the manufacturer (a $400 to $1,200 part value). Out-of-pocket costs: labour ($400 to $900), haul-away of old unit ($50 to $150 if not included), any code upgrades that have changed since the original install ($80 to $500), and shipping if the warranty replacement is mailed (rare for standard units, common for HPWH at $50 to $200). Total typical out-of-pocket: $500 to $1,500. Compare to full replacement at $1,200 to $2,500 and the warranty saves you $700 to $1,000 in real terms.
Are extended warranties from Home Depot or Lowes worth buying?
For standard tank units at $80 to $150 extended-warranty cost, the math is borderline. The manufacturer warranty of 6 to 12 years already covers the most likely failure (tank lining). Extended warranties primarily cover labour, which is meaningful only if the failure happens in the years 2 to 5 window when manufacturer covers parts but not labour. For HPWH at $150 to $300 extended-warranty cost, the case is stronger because HPWH service complexity is higher and the compressor (the most-likely-to-fail component) is more expensive than a tank element. Worth considering on HPWH, marginal on standard tank.