Rheem is one of the two dominant US residential water heater brands (Rheem and AO Smith combined have ~70% of the US residential market). Real-world ownership reviews show Rheem performing reliably across the lineup, with specific patterns by tier and product family. This page is the synthesized view of Rheem reliability based on industry reliability data and homeowner feedback.
Rheem reliability by tier
| Tier | Average service life | Most common failure |
|---|---|---|
| Marathon Lifetime | 20+ years (tank doesn't fail) | Element failure year 7–10 |
| Performance Platinum | 12–15 years | Tank shell year 12; EcoNet board year 8 |
| Performance Plus | 10–14 years | Tank shell year 10–12; gas valve year 8 |
| Professional Classic Plus | 10–14 years | Same as Performance Plus |
| Performance | 8–12 years | Tank shell year 9–11; thermocouple year 4 |
| ProTerra heat pump | Tank 13–15 years; compressor TBD (newer technology) | Compressor + heat pump assembly |
| RTGH gas tankless | 20+ years with descaling; 10 without | Heat exchanger scale buildup |
| RTEX electric tankless | 10–15 years | Element failure year 6–8 |
What owners praise
- Rheem warranty service responsiveness — consistently rated above AO Smith and on par with Bradford White
- EcoNet WiFi reliability — leak detection and remote monitoring work as advertised on Performance Platinum and ProTerra
- Marathon polybutene tank longevity — 1990s Marathon installs still in service in 2026
- RTGH tankless build quality — among the highest-rated condensing tankless in customer satisfaction
- ProTerra real-world energy savings — owners consistently report monthly electricity savings matching the marketed claims
- Big-box availability — Home Depot stocking means quick replacement when emergencies happen
What owners complain about
- Performance entry-tier gas valve failures at year 7–9 — common enough to be a meme in plumber communities
- ProTerra compressor failures in some early units — Rheem has improved this but it's still a known risk; verify your warranty covers the compressor specifically
- Plastic drain valves stripping on Performance tier — upgrade to brass at first opportunity (see our drain valve page)
- EcoNet board failures at year 7–9 on Performance Platinum — the unit still works as a basic water heater but loses WiFi features
- RTGH error code 14 (HX scale) in hard-water regions where annual descaling was skipped
- Tankless cold-water sandwich on RTGH without an aftermarket buffer tank — same issue as all pure-tankless
Rheem vs AO Smith
The two volume residential water heater brands. Head-to-head:
- Warranty: roughly equivalent at each tier. Rheem Performance Platinum 12-year vs AO Smith Signature Premier 9-year (Rheem wins). Rheem Marathon limited-lifetime vs no AO Smith equivalent (Rheem wins). At the budget tier, both ship 6-year.
- WiFi: Rheem EcoNet vs AO Smith iCOMM. Both work; EcoNet is slightly more mature.
- Real-world reliability: roughly equivalent. AO Smith's Coregard anode (slower-depleting) is a slight build-quality edge. Rheem's warranty depth on Platinum is a counter.
- Service network: equivalent — both have strong contractor networks
- Heat pump: Rheem ProTerra vs AO Smith Voltex. Generally regarded as equivalent.
For most buyers, the choice between Rheem and AO Smith comes down to: which retailer/channel you're buying through (Home Depot favors Rheem, Lowe's favors AO Smith), which brand your installer prefers, and whether you want WiFi (both have it, neither is clearly better).
Rheem vs Bradford White
Bradford White is plumber-channel only — not sold at big-box. Compared to Rheem:
- Tank longevity reputation: Bradford White has a slight edge in plumber sentiment, though Rheem warranty depth is competitive
- Warranty: Rheem Performance Platinum 12-year beats Bradford White Defender 6-year on paper. Bradford White's argument is "the tank just doesn't fail" — the warranty difference is academic if you never need to use it.
- WiFi: Rheem ships EcoNet standard on Platinum tier; Bradford White doesn't have a comparable smart-home offering
- Channel: Bradford White is plumber-direct only; Rheem is everywhere
For DIY install or big-box convenience: Rheem. For plumber-installed with the plumber's preferred brand reputation: often Bradford White. For smart-home integration: Rheem.
Bottom line
Rheem residential water heaters are competitive across the lineup. The Performance Platinum 12-year warranty + EcoNet WiFi is the strongest value play for long-horizon owners; Marathon is the only US residential lifetime-tank option; ProTerra is the right pick for electrification with the IRA tax credit. The Performance entry tier is where most reliability complaints originate — stepping up to Plus or Platinum is the easiest upgrade. For specific models see our Rheem water heater lineup.