Rheem Water Heaters

Rheem is one of the two dominant US residential water heater brands — combined with AO Smith, the two brands hold roughly 70% of the US market. Rheem manufactures every residential water heater category US homeowners actually shop: atmospheric gas tanks, power-vent and direct-vent gas, condensing gas tanks, residential electric tanks, hybrid heat pumps, gas tankless, and electric tankless. The brand sells through both the big-box channel (Home Depot, Lowe's, Rheem.com) and the licensed-plumber contractor channel, with parallel product lines targeting each. Below is the complete map of the Rheem water heater catalog we currently track — 46 active SKUs across the residential lineup — plus the brand-specific warranty, parts, troubleshooting, install, and comparison resources that round out the buying decision.

The Rheem water heater lineup at a glance

Rheem organizes residential water heaters into named tiers and lines. From most expensive to least, the tank-side lineup runs: Marathon Lifetime → Performance Platinum → Performance Plus → Professional Classic Plus → Performance → mobile-home and point-of-use specialties. The tankless side runs RTGH (gas condensing) → RTEX (electric). Heat-pump hybrid runs under the ProTerra name and shares the Performance Platinum warranty class.

• Marathon Lifetime — polybutene plastic tank, limited-lifetime warranty, the only US residential water heater whose tank doesn't corrode. Available in 40-, 50-, and 75-gallon electric. See the Marathon 50G volume pick.
• Performance Platinum — 12-year warranty, EcoNet WiFi standard, leak detection. Gas and electric tank, plus the XG50T12HE40U0 50G gas and XG29T12XR60U0 29G condensing. Tankless under the RTGH-95DVLN.
• ProTerra Hybrid Heat Pump — Performance Platinum tier in heat-pump form. 3.45 UEF, 10-year warranty, eligible for the $2,000 federal IRA tax credit. ProTerra 50G and ProTerra 80G.
• Performance Plus — mid-tier 9-year warranty. Big-box channel. Performance Plus 50G gas is the volume mid-tier pick, plus the Direct Vent variant for sealed-combustion installs.
• Professional Classic Plus — 8-year warranty, contractor-channel only (your licensed plumber stocks it). PROG50-38N-RH60 is the volume contractor pick.
• Performance — commodity entry tier. 6-year warranty. Volume Home Depot SKUs include XE40M06ST45U1, XE50M06ST45U1, and the 75G atmospheric gas.
• Power-vent and short / compact — for closet and low-clearance installs. Performance Power Vent 40G and 50G for chimney-less installs; 29G compact gas and 38G short gas for tight clearances.
• Point-of-use mini-tanks — 6G, 10G, 20G for under-sink, ADUs, RVs, and remote fixtures.
• RTEX electric tankless ladder — RTEX-04T, RTEX-06T, RTEX-08, RTEX-11, RTEX-18, plus the RTEX-AB7 booster for dishwasher and distant-shower applications.
• Mobile-home specialties — Rheem manufactures HUD-certified variants of the Performance line for manufactured homes; verify with your plumber if you're installing in a mobile home.
• Legacy Rheem Fury — the 82V-series atmospheric gas tank that Rheem manufactured from the mid-1990s through the mid-2010s. Still installed in millions of US homes. Reference pages for the legacy 82V52-2 50G, 82V40-2 40G, and 82V80-2 80G.

Best Rheem water heater by household size

Use household occupant count plus fuel availability as the first cut:

• 1–2 person households on natural gas: Professional Classic Plus 40G or Performance 29G Compact. For very low demand, the RTEX-11 electric tankless works in warm-climate states.
• 2–3 person households on natural gas: Performance Plus 40G or Performance Platinum 40G (the warranty step-up). On electric, the Performance 40G electric.
• 3–4 person households on natural gas (the volume case): Performance Platinum 50G gas is the volume premium pick. Performance Plus 50G if budget-constrained. On electric, the Performance Platinum 50G electric or the ProTerra 50G heat pump for electrification.
• 4–6 person households: RTGH-95DVLN tankless on gas (endless hot water) or ProTerra 80G heat pump on electric. Tank fallback: Performance 80G electric.
• 5–7 person households: Performance Platinum 75G gas for tank simplicity, or RTGH tankless cascade for endless hot water at scale.
• Closet / manufactured-home installs (no chimney): Performance Power Vent 40G or 50G. PVC venting replaces atmospheric flue.
• Low-clearance installs (basement rim-joist, attic): Performance 40G short gas or Performance 30G short electric.
• ADUs / pool houses / remote bathrooms: Performance 20G point-of-use for a whole bathroom, or 6G mini-tank for under-sink only.

Rheem water heater warranty — by tier and how to register

Rheem warranty terms are competitive across the lineup but vary dramatically by tier. See our dedicated Rheem warranty hub for the complete reference, registration procedure, and claim process.

• Marathon Lifetime: limited-lifetime tank, 6-year parts. The polybutene tank doesn't corrode — Rheem stands behind it for as long as you own the home.
• Performance Platinum (gas, electric, ProTerra, RTGH tankless): 12-year tank and parts. 15-year heat exchanger on RTGH. EcoNet WiFi unlocks leak alerts.
• Performance Plus: 9-year tank and parts.
• Professional Classic Plus: 8-year tank and parts (contractor channel).
• Performance (commodity): 6-year tank and parts.
• RTEX electric tankless: 5-year heat exchanger, 1-year parts.

Critical: warranty registration is required within 90 days of installation. Unregistered units default to a 6-year baseline that supersedes the tier warranty. The Performance Platinum 12-year warranty becomes a 6-year warranty if you skip registration. Register at Rheem.com/Tools/Register — or have your installer do it. To check your existing warranty by serial number, see our Rheem age-and-serial-number lookup page.

Rheem ProTerra and the heat pump electrification question

If you have or are switching to all-electric service, the Rheem ProTerra Hybrid Heat Pump is the operating-cost play. At 3.45 UEF, ProTerra cuts annual electricity to about one-third of what a resistance-electric tank consumes. For a 4-person household, that's $350–$500 saved per year — meaningful over the unit's 12-year service life.

ProTerra is eligible for the federal IRA 25C tax credit of $2,000 for heat-pump water heaters, plus most state and utility electrification rebates (Mass Save, BayREN, NYSERDA, ConEd, Sacramento SMUD, and many others). Net cost after incentives often comes in below the standard Performance Platinum 50G electric. Combined with the operating-cost savings, the ProTerra is the long-horizon math winner whenever the install location supports it.

Install requirements: 1,000+ cu ft of ambient air at the unit (unfinished basement, garage, large utility room), condensate drain or pump (2–4 gallons/day condensate), 30-amp 240V dedicated circuit, 7+ ft ceiling clearance. The two ProTerra models we track are the 50G (XE50T10HD50U1) for 2–4 person households and the 80G (XE80T10HD50U1) for 4–6 person households.

Rheem tankless — RTGH gas and RTEX electric

Rheem manufactures two tankless families: gas-condensing RTGH and electric RTEX. They serve different applications.

Rheem RTGH gas condensing tankless — the flagship is the RTGH-95DVLN at 9.5 GPM, 0.94 UEF, 12-year heat exchanger warranty, EcoNet WiFi standard. For 4–5 person households running 2 simultaneous demand points on natural gas. Requires 3/4" gas line, PVC venting up to 100 ft, and annual descaling to maintain warranty.

Rheem RTEX electric tankless — the full ladder from RTEX-04T 4kW point-of-use through RTEX-18 18kW whole-house. RTEX caps at 18kW for residential; for whole-house in cold-climate states, the Stiebel Tempra 36 Plus at 36kW is the comparison option. Standalone application: the RTEX-AB7 booster heater for dishwashers and distant-shower applications — see our Rheem booster page.

Rheem vs the competition

Direct head-to-head pages with the other major US water heater brands:

• Rheem vs AO Smith — the two volume US brands. Performance Platinum vs Signature Premier, ProTerra vs Voltex, RTGH vs ProLine Tankless. Rheem wins on warranty length at the premium tank tier and has the only lifetime-tank option (Marathon). AO Smith wins on tankless heat-exchanger warranty (15-year vs 12-year) and the slower-depleting Coregard anode.
• Rheem vs Bradford White — big-box convenience (Rheem) vs plumber-channel build quality (Bradford White). Different distribution channels make this less a direct shopping comparison than a "which channel are you using" decision. Rheem ships substantially longer warranties out of the box at the premium tier (12-year Platinum vs 6-year Defender), but Bradford White's tank-longevity reputation in the plumber community is real.

Other relevant comparisons in the broader market: Rinnai (Sensei tankless flagship), Navien (ComfortFlow tankless with buffer tank), Bosch (Greentherm tankless), Noritz (Japanese-engineering tankless heritage), Takagi (value-tier tankless under AO Smith ownership). See the full water heater category for cross-brand comparison.

Rheem parts, service items, and common repairs

Rheem residential water heaters have a small, well-documented parts catalog. The Rheem parts directory hub covers every replaceable part with current Rheem part numbers, typical pricing, and DIY-friendly assessments.

The most-replaced Rheem parts over a tank's lifetime:

• Anode rod (universal 42" hex-head, ~$40–$80) — replace at year 5 to double tank lifespan. The single highest-leverage maintenance item.
• Thermocouple (SP12090A, ~$25–$40) — the most common gas-Rheem failure. Causes "pilot won't stay lit" in 80% of cases.
• Heating element (SP10874MN, ~$30–$60) — most common electric-Rheem service item. Upper element failure = no hot water; lower element failure = hot then quickly lukewarm.
• Thermostat (upper or lower) — replacement is symptom-driven; failure pattern tells you which one.
• Pilot assembly — when thermocouple replacement doesn't resolve "pilot won't stay lit."
• Gas control valve (SP21176A, ~$180–$320) — the most expensive common failure on Rheem gas. Pro-required replacement.
• Drain valve — upgrade plastic to brass ($15–$25) at first service visit.
• T&P relief valve — test annually, replace every 5 years preventively.

Rheem troubleshooting and error codes

Most Rheem water heater problems fall into about a dozen recognizable symptom patterns. The Rheem troubleshooting hub covers each symptom by fuel type with diagnostic steps, common causes, and DIY-vs-pro guidance.

For digital-display units (RTGH gas tankless, ProTerra hybrid, RTEX electric tankless, Performance Platinum condensing), errors surface as alphanumeric codes (E1, C2, P5, code 11, code 14, etc.). The Rheem error codes hub is the complete reference with cause + fix for every common code.

For pilot-lighting questions on Rheem gas tanks, see our dedicated how to light a Rheem pilot page — the 30-second procedure for modern Rheem and the troubleshooting steps when the pilot won't stay lit.

Rheem water heater maintenance schedule

Annual flush, anode rod inspection at year 3, anode replacement at year 5, T&P valve test annually, T&P valve replacement at year 5. That's the schedule that turns a 10-year Rheem into an 18-year Rheem. See our complete Rheem maintenance hub for the year-by-year checklist by product family (tank, tankless, ProTerra heat pump).

For tankless owners: annual descaling is required to maintain RTGH and RTEX warranty terms. Skip it and Rheem can decline scale-related warranty claims. ProTerra owners: clean the front-panel air filter every 3 months (the heat pump pulls air across it; clogged filter reduces efficiency).

Rheem installation, lighting, and temperature setup

The Rheem installation guide covers permit requirements, code compliance, gas-line sizing, electrical specs, and the install procedure by unit type. Tankless and ProTerra heat pump installs are pro-recommended; standard tank swaps are within reach of a handy homeowner.

Once installed, the Rheem temperature setting page covers the 120°F default, when to raise to 130°F (dishwasher, Legionella, distant-pipe-run), when to drop to 110°F (small children, energy savings), and the mixing-valve approach for households with conflicting priorities.

How old is my Rheem water heater?

Rheem serial numbers are date-coded: first letter = month, next 2 digits = year. Example: D1812345 = April 2018. See our Rheem age and serial number lookup for the complete decode table, plus what to do once you know the age (warranty check, replacement budgeting, service-life expectations).

Average Rheem service life by tier: Performance 8–12 years, Performance Plus 10–14, Performance Platinum 12–15, ProTerra 13–15 (tank), RTGH tankless 20+ years with annual descaling, Marathon 20+ years (polybutene tank doesn't fail).

Where to buy Rheem water heaters

Rheem is sold through three primary channels:

• Home Depot — Rheem's primary big-box partner. Full Performance, Performance Plus, Performance Platinum, ProTerra, and Marathon lineup. Home delivery, in-store pickup, and Home Depot install service available.
• Lowe's — narrower Rheem selection than Home Depot (Lowe's emphasizes AO Smith) but the volume Performance and Performance Plus models are usually in stock.
• Rheem-network plumbers — the contractor channel for the Professional Classic Plus line and for tankless / ProTerra installs where Pro Partner certification matters.

Rheem customer service and warranty claims

Rheem residential water heater customer service: 1-800-621-5622, Monday–Friday 7am–7pm CT, Saturday 8am–4pm CT. See the Rheem customer service page for what they handle (warranty lookup, claim authorization, part shipment, troubleshooting), what they don't (labor reimbursement, out-of-warranty replacement), and how to escalate disputes.

For manuals, parts diagrams, and install documents on any Rheem model (current or legacy), see our Rheem manuals hub.

Rheem water heater reviews and reliability

Rheem residential water heaters are competitive across the lineup in real-world reliability. Industry data and homeowner feedback paint a consistent picture: Performance Platinum and Marathon are the long-life winners; Performance entry-tier has the most gas-valve failures at year 7–9; ProTerra real-world energy savings match marketing claims; RTGH tankless is among the highest-rated condensing tankless in customer satisfaction surveys. The Rheem reviews hub covers reliability by tier, common failure modes, and where Rheem ranks against AO Smith and Bradford White.

Bottom line on Rheem water heaters

For most US residential water heater buyers, Rheem is a defensible default. The Performance Platinum 12-year warranty + EcoNet WiFi at the volume tier is competitive with anything in the market. ProTerra is the right pick for electrification. Marathon is the only US residential water heater with a limited-lifetime tank warranty. The RTGH tankless lineup is the equal of Rinnai and Navien flagships. The retail availability through Home Depot + the contractor channel through Professional Classic Plus means there's a Rheem for nearly every buying scenario.

Where you'd skip Rheem: pure budget tier where commodity brands undercut Performance by $50–$150; very specific commercial-tier applications where boutique manufacturers do something Rheem doesn't; cases where your existing plumber is a Bradford White-network installer and the build-quality reputation of Bradford White outweighs Rheem's warranty math. For everyone else, the 46 Rheem SKUs in the catalog above are where to shop.