In 2010, Rheem's tankless water heater lineup primarily consisted of the RTG series (Mid-Efficiency/Non-Condensing) and the early introduction of their high-efficiency condensing models. These units were designed for residential use with various flow rate capacities and venting options. Gas Tankless Models (Mid-Efficiency) These models, often designated with the "RTG" prefix followed by a flow rate indicator, were the standard residential offerings in 2010.

Rheem RTG-95DV / RTG-95X: A high-capacity 9.5 GPM model available for indoor (DV - Direct Vent) or outdoor (X) installation. Rheem RTG-84DV / RTG-84X: A mid-range 8.4 GPM unit suitable for 2–3 bathroom homes. Rheem RTG-64DV / RTG-64X: A 6.4 GPM unit typically used for smaller homes or specific point-of-use applications. Rheem RTG-66DV: Another variant in the 6 GPM range for consistent hot water delivery. High-Efficiency Condensing Models Starting around 2010, Rheem introduced models that extracted heat from exhaust gases to achieve higher efficiency. Rheem Prestige RTGH-95DV: A 9.5 GPM condensing indoor model that offered up to 0.94 Energy Factor (UEF), roughly 10% more efficient than standard units. Rheem Prestige RTGH-84DV: A condensing version of the 8.4 GPM model, designed to reduce energy costs by capturing latent heat.

Rheem tankless models from 2011 are typically identified by the first four digits of their serial number, where the first two digits indicate the year (e.g., a serial starting with "11" indicates 2011). Common 2011-era gas units included the RTGH series (high-efficiency condensing) and RTG series (non-condensing), often offering 7.4 to 9.5 GPM, though specific 2011 model numbers have been superseded by newer, high-efficiency (UEF) lines. Key 2011 Rheem Tankless Features & Details Identification: Locate the rating plate on the side of the unit; the first four digits of the serial number (e.g., 1110XXXXXX) denote the month and year of manufacture. Common Series: The 2011 lineup heavily featured the RTG (natural gas/propane) and the RTGH (condensing) series, which were designed for residential and commercial applications. Performance: Models from this era often featured digital temperature controllers (80°F - 140°F) and flow rates ranging from smaller point-of-use units to high-demand 9.5 GPM models. Expected Lifespan: Gas tankless units generally last 15-20 years, meaning 2011 models are approaching their replacement timeframe. Note on Replacement

In 2012, Rheem's tankless water heater lineup focused on improving energy efficiency and expanding their RTG (non-condensing) and RTGH (condensing) series to include features like, built-in electric ignition, enhanced, low-NOx burners, and compatibility with ½-inch gas lines. The primary, high-efficiency, non-condensing gas models around that time were part of the RTG series, with capacities ranging from 6.4 to 9.5 gallons per minute (GPM). Key 2012 Rheem Tankless Gas Models The 2012 lineup included, in part, the following series: RTG-95 Series (199,900 BTU/h): Designed for 3-bathroom homes, delivering up to 9.5 GPM. RTG-95DVLN-1 / RTG-95DVLP-1: Indoor, Direct Vent (Natural Gas/Propane). RTG-95XLN-1 / RTG-95XLP-1: Outdoor. RTG-84 Series (180,000 BTU/h): Designed for 2-3 bathroom homes, delivering up to 8.4 GPM. RTG-84DVLN-1 / RTG-84DVLP-1: Indoor, Direct Vent. RTG-84XLN-1 / RTG-84XLP-1: Outdoor. RTG-64 Series (160,000 BTU/h): Designed for 1-2 bathroom homes, delivering up to 6.4 GPM. RTG-64DVLN-1 / RTG-64DVLP-1: Indoor, Direct Vent. RTG-64XLN-1 / RTG-64XLP-1: Outdoor. Prestige™ Series (Condensing): High-efficiency models utilizing PVC venting (e.g., RTGH-95 and RTGH-84 series). 2012 Model Features & Technology Venting: The RTG series used 3" / 5" concentric vent systems. Efficiency: The non-condensing RTG models boasted up to 34% more efficiency than a standard 50-gallon tank. Controls: The units typically included a UMC-117 remote control for temperature management. Safety: They included features like the Guardian OFW™ overheat film wrap. Minimum Flow Rate: The units featured a 0.26 GPM minimum flow rate and 0.40 GPM minimum activation flow rate.

In 2013, Rheem’s tankless water heater lineup focused on their EcoSense and Performance series for residential applications, offering both gas and electric models. The product range aimed at providing continuous hot water, with high-efficiency condensing gas models for whole-home use and compact electric units for point-of-use or single-shower applications. 2013 Tankless Gas Models (EcoSense/RTG Series) These units were often branded as EcoSense, featuring high efficiency and specialized venting. 199,900 BTU Models: Designed for 2–3 bathroom homes (e.g., RTG-95DVLN-1, RTG-95XLN-1). 180,000 BTU Models: Suitable for moderate demand (e.g., RTG-84DVLN-1, RTG-84XLN-1). 160,000 BTU Models: Suitable for smaller homes or lower demand (e.g., RTG-70DVLN-1, RTG-70XLN-1). Key Features: Included "cold water sandwich" elimination, digital remote controls, and high-altitude capabilities (up to 9,840 ft). 2013 Tankless Electric Models (RTE Series) These were compact, self-modulating units designed for under-sink or single-point applications. RTE 13 (13 kW): A common 240V model for single-point or small, low-demand applications (predecessor to the RTEX series). RTE 3, 6, 7, 9: Various lower-kilowatt, smaller units for single sinks or small, low-flow applications. Key Features: External digital temperature control (80°F - 140°F) and 99.8% energy efficiency. General 2013 Product Characteristics Energy Efficiency: Many models were designed with high Uniform Energy Factors (UEF). Venting: Condensing models (DVLN/XLN) typically allowed for PVC venting, reducing installation costs. Application: Ranged from small apartment/sink applications to whole-home, high-demand installations.

In 2014, Rheem's tankless lineup featured high-efficiency condensing and non-condensing gas models (RTGH and RTG series) alongside the Professional Classic series of electric tankless units. Key 2014 models focused on 9.5 GPM indoor/outdoor gas units and compact electric models like RTEX-11 and RTEX-18, suitable for point-of-use or whole-home applications. Key 2014-Era Rheem Tankless Models: Rheem Professional Prestige™ (RTGH Series): Condensing natural gas/propane models (e.g., RTGH-95) with ~0.94-0.95 UEF, featuring EcoNet smart technology and built-in condensate neutralizers. Rheem Professional Classic™ (RTG Series): Non-condensing gas models, often 9.5 GPM, designed for higher flow demand. Rheem RTEX Series Electric: Compact, self-modulating electric units (e.g., RTEX-11, RTEX-18, RTEX-36) with digital thermostatic controls, ideal for small spaces or point-of-use. Features & Specifications (circa 2014): Efficiency: Gas models offered UEF up to 0.95, while electric models utilized modulating technology for energy savings. Performance: Gas units typically offered up to 9.5 GPM, while electric units ranged from 0.5 GPM to higher capacities depending on the model. Design: Units were designed for easy installation, with electric units being up to 93% smaller than traditional tanks. Determining Age: To confirm if a unit is from 2014, check the serial number on the rating plate. The first four digits indicate the week and year (e.g., a serial starting with "14" or a date code from 2014). Tankless Water Heaters - Rheem Manufacturing Company Professional Classic Series Tankless Electric RTEX-3.5, RTEX-06 kW. UEF up to 0.95. Flow Rate up to 1.6 GPM (See specification she... Rheem Manufacturing Professional Classic Series Tankless Electric RTEX-18 - Rheem Saves Space – up to 93% smaller than a standard electric water heater. Saves Energy – zero standby heat loss when installed near t... Rheem Manufacturing Tankless Water Heaters - V3 www.rheem.ca Rheem offers a full line of tankless water heaters. You can choose from natural gas and propane gas models. Here are some of their... Rheem Canada Show all

In 2015, Rheem offered a range of tankless water heaters, primarily focused on the RTG Series (non-condensing) for high-efficiency, standard, and outdoor installations, alongside early models of their condensing technology and residential electric units. Key models and series available around 2015 include: Gas Tankless Models (RTG & RTGH Series) RTG-70DVLN-3 (160,000 BTU): Indoor direct vent natural gas unit, often used for smaller homes or moderate climates. RTG-84DVLN-3 (180,000 BTU): Indoor direct vent natural gas unit for medium-sized homes. RTG-90DVLN-3 (199,900 BTU): High-output indoor unit designed to handle higher hot water demands. RTG-95DVELN-3 (199,900 BTU): Often featured Wi-Fi capability for remote monitoring. RTG Series Outdoor Models: Available for warm climates, often designated with "X" instead of "V" in the model number (e.g., RTG-95XLN). RTGH Series (Condensing): Super High-Efficiency (SHE) units that achieved higher energy factors by using PVC for venting. Electric Tankless Models (RTEX Series) RTEX-04T / RTEX-06T: Smaller units for single-point or low-demand use. RTEX-18 (18kW): Suitable for moderate whole-home needs. RTEX-24 (24kW): Designed for medium-sized homes. RTEX-27 (27kW): A common, higher-capacity residential unit. RTEX-36 (36kW): High-capacity unit for large homes. 2015 Features Efficiency: Non-condensing units typically offered a UEF of up to .82. Ventling: The RTG series was known for 43-foot venting capability. Controls: Digital displays were standard for temperature control, with some models featuring built-in Wi-Fi and EcoNet technology. Maintenance: Many models featured self-diagnostic systems.

In 2016, Rheem's tankless water heater lineup focused on high-efficiency condensing gas models (RTGH Series), non-condensing gas models (RTG Series), and electric tankless units (RTEX Series). Key innovations during this period included built-in EcoNet Wi-Fi technology, "Hot Start" programming to minimize cold water sandwiches, and increased compatibility with 1/2-inch gas lines. Key 2016 Gas Tankless Models RTGH Series (Prestige Super High-Efficiency Condensing): These models (e.g., RTGH-95DVLN, RTGH-84DVLN) were the top-tier units, featuring a 0.93-0.94 Uniform Energy Factor (UEF) and using PVC venting. RTGH-95DVLN (Natural Gas) / DVLP (Propane): 9.5 GPM, ideal for 3+ bathrooms. RTGH-84DVLN / DVLP: 8.4 GPM, suitable for medium-sized homes. RTGH-68DVLN / DVLP: 6.8 GPM, designed for smaller homes. RTG Series (High-Efficiency Non-Condensing): These models (e.g., RTG-64DVN, RTG-84DVN) were designed for indoor/outdoor installation with category III stainless steel venting. RTG-64DVLN/XN: 6.4 GPM, suitable for up to 3 bathroom homes. Key 2016 Electric Tankless Models (RTEX Series) Rheem’s RTEX series offered compact, self-modulating, on-demand electric units. RTEX-13: 13kW (approx. 2.3 GPM) RTEX-18: 18kW (approx. 3.1-4.4 GPM) RTEX-24: 24kW (approx. 4.3 GPM) RTEX-27: 27kW (approx. 4.9 GPM), commonly used for whole-home application in warmer climates. Main Features & Technology (Circa 2016) EcoNet Wi-Fi: Integrated or optional Wi-Fi to monitor and control the heater via a smartphone app. Hot Start Programming: Kept the unit in a "ready-fire" state to minimize cold water bursts. Venting: Condensing models (RTGH) supported 2-inch or 3-inch PVC pipe, significantly reducing installation time and costs. Gas Line Compatibility: Many 2016 models were compatible with 1/2-inch gas lines up to 24 feet. Warranty: Generally 12-15 years on the heat exchanger, 5 years on parts. RHEEM PRESTIGE RTGH SERIES CRTGH-95DVLN-2 GAS WATER HEATER, 11 TO 199 MBTU/HR, NATURAL GAS Manufacturer: Rheem Manufacturing Brand Name: Rheem Part#: RHECRTGH-95DVLN MPN: CRTGH-95DVLN-2 High efficiency tankless with EcoNe... Google Tankless Water Heaters - Rheem Manufacturing Company UEF up to .96. Flow rate 0.8 - 1.4 GPM. Durable, lightweight engineered polymer shell does not rust or corrode. Digital thermostat... Rheem Manufacturing RHEEM® PRESTIGE® RTGH SERIES CRTGH-95DVLN-2 ... High efficiency tankless with EcoNet® smart home technology. Rheem® Prestige® RTGH is a series of high efficiency condensing tankl... HYDROTECH MECHANICAL INC. Show all

In 2017, Rheem offered a comprehensive lineup of tankless water heaters, focusing on high-efficiency condensing gas models, non-condensing gas models, and electric tankless units. The lineup prominently featured the Prestige (condensing) and Classic (non-condensing) series, along with advancements in smart technology. 2017 Rheem Tankless Gas Models Rheem's gas lineup around 2017 was characterized by high-efficiency condensing units and reliable non-condensing units, featuring low NOx emissions and digital displays. Rheem Prestige Series (RTGH - Condensing): These were high-efficiency condensing units (e.g., RTGH-95DVLN), often featuring EcoNet smart technology, stainless steel heat exchangers, and the ability to vent with PVC. Rheem Classic Series (RTG - Non-Condensing): Known as high-efficiency non-condensing units (e.g., RTG-70DVLN), typically available in 7.0 to 9.5 GPM, ideal for indoor and outdoor installations. Key Features (2017 Gas Models): Flow Rates: Ranged from 7.0 to 9.5 gallons per minute (GPM). Recirculation: Some models were "recirculation pump kit-ready" to provide faster hot water. Venting: Capable of 2-inch or 3-inch venting options for easier installation. Gas Types: Available in Natural Gas and Liquid Propane. 2017 Rheem Tankless Electric Models The electric lineup was known for its "Professional Classic" series, often used for point-of-use or smaller residential applications. RTEX Series: Models included the RTEX-04, RTEX-06, RTEX-09, RTEX-11, RTEX-18, RTEX-27, and RTEX-36. Key Features (2017 Electric Models): Self-Modulating: Advanced technology to adjust power consumption based on demand. Temperature Control: Digital thermostatic control (80°F - 140°F). Capacity: Ranged from small point-of-use (0.25 GPM) to whole-home (4.9 GPM). Installation: Compact, wall-mounted designs. Key 2017 Technologies EcoNet Smart Technology: Enabled, allowing monitoring via a mobile app for select models. Hot Start Programming: Minimized cold water bursts by keeping the heater in a "ready" state. Water Savings Setting: Reduced the flow of water until the temperature was reached.

In 2018, Rheem offered a comprehensive lineup of tankless water heaters, focusing on high-efficiency condensing units, mid-efficiency non-condensing units, and electric on-demand options. Key 2018 models included the Prestige (condensing), Performance (non-condensing/electric), and EcoSense series. Rheem Tankless Gas Models (2018 Lineup) Rheem Prestige Series (Condensing): Known for high efficiency (up to 94% or .94 UEF). CRTGH-95DV: An indoor direct-vent model, with 11,000 to 199,900 BTU, capable of delivering 9.5 gallons per minute (GPM) at a 35°F rise. Features: Included stainless steel condensing heat exchanger, 2-pipe direct vent system (PVC/CPVC), and integrated EcoNet Wi-Fi technology. Rheem RTG Series (Non-Condensing): High-efficiency outdoor models. RTG-95X: An outdoor unit with up to .82 UEF, featuring 9.5 GPM flow rate and EcoNet Wi-Fi capability. Rheem EcoSense Series (Gas): High-efficiency units, including models designed for 2-3 bathroom homes (e.g., CECO180 DVP). Rheem Tankless Electric Models (2018 Lineup) Rheem's electric models often fell under the "Performance" or "Professional Classic" series. RTEX Series: Self-modulating electric tankless heaters designed for on-demand hot water. RTEX-18: 18 kW unit (240V), providing up to 4.4 GPM, suitable for whole-home use in warmer climates or as point-of-use. RTEX-27: 27 kW unit (240V), suitable for larger homes with 1-2 showers. RTEX-04/06/08/11/13: Smaller, lower-amperage units for specific sinks or showers. Key 2018 Features Hot-Start Programming: Minimized cold water bursts by keeping the heater in a "ready fire" state. Water Savings Setting: Reduced flow rates until the target temperature was met. Venting: Condensing models allowed for 2-inch or 3-inch PVC vent pipe, simplifying installation. Warranty: 12-year warranty on the heat exchanger for residential gas models, and 5-year on electric heating chambers. RHEEM PRESTIGE RESIDENTIAL TANKLESS Page 1. + RHEEM PRESTIGE RESIDENTIAL TANKLESS. CONDENSING TANKLESS SERIES. Continuous hot water for 3 bathroom homes* CRTGH-95DV i... www.communitygas.com Tankless Water Heaters - Rheem Manufacturing Company Propane Gas. Natural Gas. RTG Series High Efficiency Non-Condensing Outdoor Tankless Gas Water Heater w/ Wi-Fi. 9.5-9.5 GPM. Up to... Rheem Manufacturing RHEEM PRESTIGE RTGH SERIES CRTGH-95DVLN-2 GAS WATER HEATER, 11 TO 199 MBTU/HR, NATURAL GAS Manufacturer: Rheem Manufacturing Brand Name: Rheem Part#: RHECRTGH-95DVLN MPN: CRTGH-95DVLN-2 High efficiency tankless with EcoNe...

Based on 2019–2020 era, Rheem offered a range of tankless water heaters across three primary categories: High-Efficiency Condensing (RTGH), Mid-Efficiency Non-Condensing (RTG), and Electric (RTEX). 1. High-Efficiency Condensing Tankless Gas (RTGH Series) These models are designed for higher efficiency (typically 0.93 UEF) and use PVC piping for venting. RTGH-95DVLN-3: 9.5 GPM, Indoor, Natural Gas RTGH-95DVLP-3: 9.5 GPM, Indoor, Propane RTGH-95XLN: 9.5 GPM, Outdoor, Natural Gas RTGH-84DVLN-2: 8.4 GPM, Indoor, Natural Gas RTGH-84XLN-2: 8.4 GPM, Outdoor, Natural Gas RTGH-68DVLN-2: 6.8 GPM, Indoor, Natural Gas 2. Mid-Efficiency Non-Condensing Tankless Gas (RTG Series) Designed for standard, more budget-friendly applications. RTG-95DVLN-1: 9.5 GPM, Indoor, Natural Gas RTG-95XLN-1: 9.5 GPM, Outdoor, Natural Gas RTG-84DVLN-1: 8.4 GPM, Indoor, Natural Gas RTG-84XLN-1: 8.4 GPM, Outdoor, Natural Gas RTG-70DVLN-3: 7.0 GPM, Indoor, Natural Gas RTG-70DVLP-3: 7.0 GPM, Indoor, Propane RTG-70XLN-1: 7.0 GPM, Outdoor, Natural Gas 3. Electric Tankless (RTEX Series) Used for point-of-use or whole-home, depending on capacity, typically featuring self-modulating technology. RTEX-04: 3.5kW, 120V RTEX-06: 6.5kW, 240V RTEX-08: 8kW, 240V RTEX-11: 11kW, 240V RTEX-13: 13kW, 240V RTEX-18: 18kW, 240V RTEX-24: 24kW, 240V RTEX-27: 27kW, 240V RTEX-36: 36kW, 240V 4. Performance Platinum Series (Gas) Rheem Performance Platinum High Eff Condensing 9.5 Max GPM (199K BTU) - Available in Wi-Fi enabled models. Rheem Performance Platinum High Eff Condensing 8.4 Max GPM (160K BTU). Key Features of 2019 Models Venting: Condensing models allowed for PVC, saving on installation costs. Recirculation: Some models included built-in, or compatibility with, recirculating pumps for faster hot water. Control: Many featured digital displays with 1-degree temperature precision.

Based on 2020–2021 market data, Rheem’s tankless water heater lineup was primarily divided into High-Efficiency Condensing (Platinum) and Mid-Efficiency Non-Condensing series, alongside their electric tankless options (RTEX). Here are the prominent Rheem tankless water heater models active around 2020: Gas Tankless Models Rheem Performance Platinum (Condensing): These were high-efficiency models with Wi-Fi capability. 9.5 Max GPM (Indoor): 199,900 BTU unit, often with 15-year warranty, designed for up to 3 bathrooms. 9.5 Max GPM (Outdoor): 199,000 BTU unit, often with 12-year warranty. Rheem RTG Series (Mid-Efficiency Non-Condensing): RTG-70DVLN-3: 160,000 BTU Indoor Natural Gas (7.0 GPM). RTG-70DVLP-3: 160,000 BTU Indoor Liquid Propane (7.0 GPM). RTG-70XLN-1: 160,000 BTU Outdoor Natural Gas. Rheem IKONIC™: Premium condensing models often featuring built-in recirculation pumps, 8.4–11.2 GPM. Electric Tankless Models (Performance/RTEX Series) These were compact units commonly used for point-of-use or whole-home, featuring self-modulation. RTEX-04T/06T/08: Small, 120V/240V, 3.5kW–8kW models for single sinks or low-flow showers. RTEX-11/13/18: Mid-range, 240V, 11kW–18kW models. RTEX-24/27/36: High-capacity, 240V, 24kW–36kW models for whole-home application. Key 2020 Features Venting: Condensing models (Platinum) used PVC, while non-condensing (RTG) required stainless steel. Efficiency: Condensing models had a Uniform Energy Factor (UEF) around 0.93. Control: Many featured integrated digital displays for temperature setting (80°F - 140°F).

Based on 2021 market listings and product documentation, Rheem’s tankless water heater lineup focused heavily on the Performance Platinum and Professional Prestige series, featuring condensing (high efficiency) and non-condensing gas models, as well as electric tankless units. Here are the key Rheem tankless water heater models available in 2021: 1. Gas Tankless Models (Condensing & Non-Condensing) These models are designed for high efficiency and use PVC piping for venting in many cases. Performance Platinum Series (Condensing): 9.5 GPM (Gallons Per Minute) Indoor/Outdoor, Natural Gas or Propane, 199K BTU 8.4 GPM Indoor/Outdoor, Natural Gas or Propane, 160K BTU Features 0.93 UEF (Uniform Energy Factor), integrated recirculation pump option, and built-in WiFi on select models. Professional Prestige Series (Condensing - RTGH Series): RTGH-95DVLN-2 (9.5 GPM, Indoor, Natural Gas, 199K BTU) RTGH-95DVLP-2 (9.5 GPM, Indoor, Propane, 199K BTU) RTGH-95DVELN-2 (9.5 GPM, Indoor, Natural Gas, with EcoNet) RTGH-95DVELP-2 (9.5 GPM, Indoor, Propane, with EcoNet) Mid-Efficiency (Non-Condensing - RTG Series): RTG-95DVLN-3 (9.5 GPM, Indoor, Natural Gas) RTG-70DVLN-3 (7.0 GPM, Indoor, Natural Gas) RTG-70DVLP-3 (7.0 GPM, Indoor, Propane) 2. Electric Tankless Models (RTEX Series) These are commonly used for point-of-use or whole-home applications, known for being compact. RTEX-04T/06T: 3.5 kW - 6.5 kW (120V/220V) RTEX-08: 8 kW (240V) RTEX-11: 11 kW (240V) RTEX-13: 13 kW (240V) RTEX-18: 18 kW (240V) RTEX-24: 24 kW (240V) RTEX-27: 27 kW (240V) RTEX-36: 36 kW (240V) Key 2021 Features Performance Platinum/Prestige: 0.93-0.96 UEF ratings, Wi-Fi enabled (EcoNet), and 12-15 year heat exchanger warranties. RTEX Series: Self-modulating power, 5-year heat exchanger warranty. Venting: Most 2021 Performance Platinum models allowed for PVC venting.

Rheem’s 2022 tankless water heater lineup focused on high-efficiency gas (Condensing/Non-Condensing) and versatile electric models, including the RTEX (Professional Classic) series, Performance Platinum gas units, and Ikonic high-efficiency series Wholesale Water Heaters. Key 2022 Rheem Tankless Models: Electric Tankless (RTEX Series): RTEX-04T (120V), RTEX-06T, RTEX-08, RTEX-11, RTEX-13, RTEX-18, RTEX-24, and RTEX-27. Gas Tankless (Indoor/Outdoor): Performance Platinum Condensing (9.5-10 GPM), Performance Non-Condensing 9.5 Max GPM. Specialty/High-Efficiency: Ikonic series (9.5 GPM, 11 GPM), ProTerra® Heat Pump Water Heaters (hybrid). These units are designed for continuous hot water, with features like digital controls and self-modulation, particularly in the RTEX electric line.

In 2023, Rheem’s tankless water heater lineup focused on high-efficiency gas models and versatile electric units, prominently featuring the RTEX electric series (RTEX-04T to RTEX-36) and Performance/Professional Classic gas series (RTG, RTGH, and Ikonic). These models offer compact, on-demand heating for residential and commercial applications. Key 2023 Rheem Tankless Models: Rheem RTEX Series (Electric): RTEX-04T/06T/08: Small capacity (3.5kW - 8kW) for point-of-use or low-demand applications. RTEX-11/13: Mid-range units (11kW - 13kW). RTEX-18/24/27/36: High-capacity units (18kW - 36kW) for whole-home electric demand. Rheem Gas Tankless (Condensing & Non-Condensing): RTG Series (Performance/Classic): Reliable non-condensing gas models, popular for standard efficiency. RTGH Series (Performance/Platinum): Condensing gas models offering higher efficiency (often 0.94 - 0.96 UEF). Ikonic Series: Premium high-efficiency condensing units (natural gas/propane). Commercial Models: Specialized high-output, 9.5 GPM liquid propane or natural gas units. Key Features for 2023: Efficiency: Many models are Energy Star rated with UEF up to .96. Controls: Digital thermostatic temperature control in 1-degree increments. Capacity: Ranging from point-of-use electric to high-output 9.5+ GPM gas units. Durability: Professional Classic Series units often feature corrosion-resistant polymer or stainless steel components.

In 2024, Rheem continues to offer a comprehensive lineup of tankless water heaters divided primarily into Gas Condensing (high efficiency), Gas Non-Condensing (standard efficiency), and Electric (point-of-use or whole-home) models, frequently marketed under the "Performance" and "Performance Platinum" series. Here is a list of key Rheem tankless models available in 2024: 1. Gas Tankless Models (Indoor/Outdoor) RTGH Series (Super High Efficiency Condensing): RTGH-95DVLN / RTGH-95DVLP: 9.5 GPM, 199,900 BTU, 0.93-0.96 UEF. Features: Built-in EcoNet® Wi-Fi technology, compatible with PVC venting, includes LeakGuard®. RTG Series (High Efficiency Non-Condensing): RTG-95XLP / RTG-95XLN: 9.5 GPM, up to 0.82 UEF, suitable for outdoor installation. Features: Includes remote control and digital display. Performance Platinum Series (Condensing): 9.5 Max GPM (199K BTU): Common high-demand model. 9.0 Max GPM (180K BTU): High-efficiency model. 8.4 Max GPM (160K BTU): Suitable for 1-2 bathroom homes. 2. Electric Tankless Models (RTEX Series) These are compact, point-of-use or whole-home units often used for smaller, warmer homes or under-sink applications. RTEX-04 / RTEX-04T: 3.5 kW, 120V or 240V, low flow. RTEX-06 / RTEX-06T: 6.5 kW, 240V, low flow. RTEX-08: 8 kW, 240V. RTEX-11: 11 kW, 240V. RTEX-13 / RTEX-13kW: 13 kW, 240V. RTEX-18 / RETEX-18: 18 kW, 240V, 4.4 GPM. RTEX-24 / RETEX-24: 24 kW, 240V, 5.9 GPM. RTEX-27 / RETEX-27: 27 kW, 240V. RTEX-36 / RETEX-36: 36 kW, 240V. 3. Key 2024 Series Distinctions Performance Platinum: Often features higher efficiency (0.93+ UEF), built-in EcoNet Wi-Fi for smartphone control, and a 15-year heat exchanger warranty. Performance: Reliable, high-efficiency options often exclusive to The Home Depot. EcoSense: Specific models noted for water-saving and environmental efficiency. Note: Models may have variants for Natural Gas (N) or Liquid Propane (P) and Indoor (i) or Outdoor (x) installation.

Rheem's 2025 tankless water heater lineup features high-efficiency gas and electric models designed for on-demand hot water, featuring Professional Prestige and Classic Series RTEX electric units (up to 36kW). Key models include the 9.5 GPM gas heaters and compact RTEX-13/RTEX-18 units, offering up to 99.8% energy efficiency and durable construction. Key 2025 Rheem Tankless Models & Series Rheem Professional Classic Series (Electric):RTEX-36: 36kW, 240V, high-capacity model (up to 8.8 GPM).RTEX-24: 24kW model.RTEX-18: 18kW model.RTEX-13/REX 13: Compact, 1.5 GPM model suitable for small to medium homes.RTEX-06T/04: Lower kW options for point-of-use or smaller needs.Rheem Gas Tankless Series:Professional Prestige Series (Gas): Includes high-efficiency indoor models, often with 9.5 GPM capacities for heavy residential demand.Commercial 9.5 GPM Indoor: Highly rated for high-efficiency liquid propane or natural gas needs. Key Features for 2025 Efficiency: Units often feature high Uniform Energy Factors (UEF) up to 0.94-0.95 for gas models, with electric models providing near-total efficiency.Performance: Digital thermostatic controls with 1-degree increments (typically \(80^{\circ }\text{F}\) - \(140^{\circ }\text{F}\)). 2011