Best Rheem Tankless Water Heaters 2026: IKONIC vs Performance Platinum vs RTEX, Every Line Ranked

Quick Answer: The best Rheem tankless water heater for most gas homes is the IKONIC (sold as ECOHS200iN at Home Depot, RTGH-S11i through pro supply) — a condensing unit rated up to 11.2 GPM at a 35°F rise (4.7 GPM from 37°F winter groundwater, per Rheem) at a 0.96 UEF with built-in EcoNet Wi-Fi, listed at $1,799 with a $1,439.20 sale price at Home Depot in our September check and $1,778.69 for the pro RTGH-S11i at TanklessWaterHeaters.com on November 5, 2026. The Performance Platinum ECOH200DVELN-3 (about $1,199, 9.5 GPM, 0.93 UEF) is the best-value condensing pick, and the Performance Plus ECO200DVELN-3 (about $1,057) is the budget gas play. Going electric? The 24 kW RTEX-24/RETEX-24 (now $549 at Home Depot) is the whole-home warm-climate pick and the RTEX-13 (about $255–$365) covers a single fixture. Every GPM figure below assumes a warm inlet — cold winter water lowers real flow.

Rheem sells more tankless water heaters through big-box retail than any other brand — but its catalog is genuinely confusing, because almost every unit exists twice: once as a retail SKU at Home Depot (RETEX, ECO, ECOH, ECOHS) and once as a pro SKU through plumbing supply (RTEX, RTGH). This guide ranks every current residential Rheem line and decodes the naming so you can compare apples to apples — and spot when the “different” model a supplier quotes you is the same machine with a different sticker.

Last updated November 5, 2026: corrected the IKONIC entries against Rheem’s IKONIC product pages, spec sheets and warranty certificate. The IKONIC does not have LeakGuard (Rheem lists it only on the 0.93 UEF Performance Platinum line), its heat-exchanger warranty is 15 years, not 12, and every Rheem tankless warranty term ends after 12,000 operating hours. The pump-equipped IKONIC is sold at retail too (ECOHSR200iN), and the pro version is the RTGH-SR11i. Added November 5 trade prices from TanklessWaterHeaters.com; Home Depot blocked our price check, so Home Depot prices below are from September 29. Full details in our new Rheem IKONIC review.

Previous update, September 29, 2026: re-checked Home Depot pricing — the IKONIC’s sale price reversed back down to $1,439.20 (a 20% markdown off the $1,799 list, after briefly narrowing to 10%/$1,619.10 in August), and the RETEX-24 rose from $519 back to $549 — both prices swung back to where they sat in July, evidence Home Depot’s tankless promos move in both directions rather than trending steadily one way. Performance Platinum, Performance Plus, and RTEX-13 pricing held steady; the expired-25C-credit note remains accurate.

Rheem’s model names, decoded

Rheem runs two parallel catalogs for the same hardware platforms:

• Retail (Home Depot): Performance = RETEX electric · Performance Plus = ECO gas non-condensing · Performance Platinum = ECOH gas condensing · IKONIC = ECOHS super-high-efficiency condensing flagship.
• Pro (plumbing supply): Professional Classic = RTEX electric · Professional RTGH = gas condensing · IKONIC’s pro twins = RTGH-S11i (no pump) and RTGH-SR11i (built-in pump), which ship with a propane conversion kit instead of separate N/P SKUs.
• The ratings differ even when the hardware doesn’t. Rheem rates the pro RTEX-24 at up to 5.9 GPM in warm climates, while Home Depot lists the retail RETEX-24 at 4.68 GPM — same 24 kW class, different temperature-rise assumptions in the spec sheet.
• Suffixes: DV = direct vent (indoor) · X = outdoor · N = natural gas · P/LP = propane · “-3” = current generation on retail gas models.

Our top picks at a glance

By the numbers

• 0.96 UEF on the IKONIC condensing platform — ENERGY STAR certified and up to a 36% reduction in energy use versus a standard 0.61-UEF 50-gallon tank, per Rheem. — Rheem
• 4.7 GPM from 37°F groundwater for the 199,900 BTU IKONIC at a 120°F setting, from the zone table in Rheem’s TK-RTGHS wholesale spec sheet. The 11.2 GPM headline assumes a 35°F rise. — Rheem
• 12,000 operating hours: the cap on every term of Rheem’s residential tankless gas warranty (certificate AP21265 Rev 04), alongside 15 years on the heat exchanger, 5 on parts and 1 on labor. — Rheem
• $1,799 list, $1,439.20 on sale for the IKONIC ECOHS200iN at Home Depot as of September 2026 — back to a 20% markdown, after briefly narrowing to 10%/$1,619.10 in August. — Home Depot, September 2026
• 5.9 GPM (Rheem, warm climate) vs 4.68 GPM (Home Depot listing) for the same 24 kW electric platform (RTEX-24 vs RETEX-24) — the clearest published example of why you should size by temperature rise, not the number on the box. — Rheem / Home Depot
• 9.5 GPM at a 35°F rise and a 0.93 UEF for the Performance Platinum ECOH200DVELN-3, with EcoNet WiFi and LeakGuard built in. — Rheem spec sheet
• Up to 34% energy/cost savings in whole-home electric installs claimed for the self-modulating RETEX line versus a standard electric tank. — Rheem / Home Depot

1. Rheem IKONIC ECOHS200iN — Best Overall

The IKONIC is Rheem’s answer to the Rinnai Sensei RX and Navien NPE-2 flagships, and it’s the Rheem gas tankless we’d buy: 0.96 UEF condensing efficiency, indoor installation (outdoor with Rheem’s RTGH-SX kit) and built-in EcoNet Wi-Fi, which Rinnai and Navien sell as add-on modules. At the $1,799 list price it’s a fair fight with the Rinnai RX199iN ($1,532.79 to $1,768.98 at Rinnai-authorized e-tailers on October 31, 0.98 UEF, 15-year heat exchanger, 5 years labor if registered); at the $1,439.20 Home Depot sale price we saw in September, the IKONIC is an even easier win. Buying through a plumber? Ask for the pro twin, the RTGH-S11i, which is the same platform. Our Rheem IKONIC review decodes all 18 IKONIC model numbers and the warranty fine print.

2. Rheem Performance Platinum ECOH200DVELN-3 — Best Value Condensing

For most gas households, this is the sweet spot in Rheem’s catalog: you keep the condensing efficiency, the cheap PVC venting, and the smart features (the federal 25C credit no longer applies — it expired for equipment placed in service after December 31, 2025), and you give up about 1.7 GPM of warm-inlet headroom versus the IKONIC for $600 less at list. If your realistic peak is two showers, the Performance Platinum will never feel small. It’s also the unit we shortlisted in our best gas tankless roundup as the strongest retail-availability pick — no plumbing-supply account required.

3. Rheem Performance Plus ECO200DVELN-3 — Best Budget Gas

The Performance Plus is the classic non-condensing trade: about $140 cheaper than the Performance Platinum up front, but it wastes more heat (non-condensing units run in the 0.81–0.82 UEF class) and its hot exhaust demands pricier venting indoors. The math that decides it is the vent run: mounting it outdoors (the ECO200XELN-3 variant) erases the venting cost and makes this the cheapest whole-home gas path in Rheem’s lineup — the same logic our tankless vs tank guide applies to total installed cost rather than sticker price.

4. Rheem RTEX-24 / RETEX-24 — Best Whole-Home Electric

Rinnai and Navien don’t make electric tankless units — Rheem does, and dominates the category. The 24 kW RTEX-24 (or its retail twin RETEX-24 at $549 from Home Depot) is the pick for 1–2 bath homes in warm and moderate climates: no gas line, no venting, and an install that’s often half the cost of gas. The catch is winter physics — at a northern 60–70°F temperature rise, 24 kW supports roughly one to two fixtures, not a whole busy household. Cold-climate whole-home buyers should step up to the 36 kW RTEX-36 (roughly 150A of service) or stay with gas; our best electric tankless roundup walks the full sizing ladder. Rheem’s closest value rival here is the lifetime-warranty EcoSmart ECO 27, which lands at nearly the same ~$500 price.

5. Rheem RTEX-13 — Best Point-of-Use Electric

The RTEX-13 is the unit that made Rheem the default name in electric tankless: around $255–$365 street, one breaker slot, and endless hot water for a bathroom, garage sink, or accessory apartment. It’s a point-of-use heater first — pair it with the fixture it serves and it shines; ask it to run a northern two-bath house and it will disappoint. The retail twin is the RETEX-13 (2.54 GPM per Home Depot’s colder-rise rating — the same two-catalog math as the 24 kW pair). It’s also the pick for a barn with an existing sub-panel that would rather skip propane entirely — see our best tankless water heater for a barn guide for that comparison against battery-ignition propane units. One size up, the 18 kW RTEX-18 needs two 40A breakers (75A) and is the largest Rheem electric model Rheem recommends for a 150A panel; our Rheem RTEX-18 review shows its 1.8 to 4.4 GPM range across Rheem’s nine groundwater zones.

6. Rheem RTGH-S11i / RTGH-SR11i — Best Pro Install & Recirculation

If a contractor is doing the install, the quote will likely say RTGH, not ECOHS — don’t let the unfamiliar SKU push you into thinking it’s a different (or older) machine. The pump version exists in both channels: RTGH-SR11i through plumbers and ECOHSR200iN at retail. Its built-in pump cuts the wait for hot water at far fixtures. Keep the pump on demand or on a timer: Rheem’s warranty drops the heat exchanger from 15 years to 3 when a recirculation pump runs continuously.

How to choose a Rheem tankless water heater

• Decode the SKU first: RETEX/ECO/ECOH/ECOHS = retail (Home Depot); RTEX/RTGH = pro. Same platforms, different stickers and sometimes different advertised GPM — compare kW and BTU, not marketing flow numbers. See our Home Depot tankless water heater guide for the full retail lineup and current pricing across brands, not just Rheem.
• Gas: condensing is usually worth it. The 0.93–0.96 UEF ECOH/ECOHS units vent in cheap PVC (the federal 25C credit that once applied here expired after December 31, 2025); the ~$140 saved on a non-condensing ECO can vanish into its stainless vent kit.
• Electric: size by amperage, then climate. 13 kW (54A) = one fixture; 24 kW (three 40A breakers) = warm-climate 1–2 baths; 36 kW (~150A) = cold-climate whole home. Panel upgrades cost more than the heater — check before you buy.
• Size by winter, not the box: Rheem’s own numbers show the same 24 kW unit rated 5.9 GPM (warm climate) or 4.68 GPM (colder assumed rise). Use your coldest-month inlet temperature.
• Match the fuel suffix: N = natural gas, P/LP = propane on retail gas models, which are ordered by fuel. The pro RTGH-S/SR IKONIC is the exception: it ships set for natural gas with a propane conversion kit included.
• Won’t fire at all? Rheem, Ruud, and Richmond tankless units share a single igniter part number for a Code 11 fault — see our best tankless water heater igniter guide before assuming the whole unit has failed.
• Code 16 or Code IL on an RTGH unit? That’s the heat exchanger, and Rheem’s replacement part runs over $1,100 before labor — see our best tankless water heater heat exchanger guide to check whether repair or a new unit makes more sense.

Just need one sink?

Rheem’s smallest tankless is the 3.5 kW RETEX-04T (sold to wholesalers as the RTEX-04) — the same retail-versus-pro catalog split described above, applied to a point-of-use unit. Home Depot rates it at 0.68 GPM, and Rheem also sells a 2.5-gallon plug-in MiniTank for the same job. We compare both approaches in the best point-of-use water heater guide.

The bottom line

For most gas homes, the Rheem IKONIC (ECOHS200iN) is the best Rheem tankless water heater — 11.2 GPM warm-inlet flow, 0.96 UEF, built-in Wi-Fi and a 15-year heat-exchanger warranty, especially when it’s on sale near the $1,439.20 we saw in September. The Performance Platinum ECOH200DVELN-3 at ~$1,199 is the value condensing play, and the Performance Plus covers tight budgets. Going electric, the RTEX-24/RETEX-24 from $549 and the point-of-use RTEX-13 are the class defaults — a category where Rheem barely has competition from the other big gas brands. Comparing across brands? Start with our best tankless water heater roundup for every fuel type, the Rinnai lineup guide for the flagship rivalry, our Rinnai vs Rheem head-to-head for the direct RX199iN-vs-IKONIC comparison, our Navien vs Rheem comparison for how the IKONIC stacks up against the NPE-240A2, our Takagi guide for the discontinued-brand closeouts, or our electric vs gas comparison if you’re not sure which fuel fits your home. Want the same core hardware for less? Rheem’s own value-tier tankless line, sold mainly through Menards under the Richmond badge, undercuts these prices — see our best Richmond tankless water heater guide for what you give up in warranty coverage for the discount. Prefer Rheem’s own installed-and-warrantied route instead of buying a box? Our Costco tankless water heater guide covers Costco’s exclusive Rheem installation program and its 12-year warranty. Curious who actually owns Rheem? Our best Paloma tankless water heater guide covers the Japanese parent company’s own legacy lineup, still sold under its own name. Shopping online instead of a big-box aisle? Our Walmart tankless water heater guide covers a retailer that lists Rheem’s real RTEX pro-channel names directly, unlike Home Depot’s retail-renamed RETEX/ECOH line. Comparing the EcoNet feature itself against rival brands? Our smart tankless water heater guide breaks down why Rheem’s built-in WiFi is actually the exception, not the norm, versus Rinnai and Noritz’s bolt-on modules.