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Rheem

Rheem is a trusted leader in water heating solutions, specializing in high-efficiency tankless water heaters for residential use, offering both gas and electric models.

11 products Updated March 4, 2026

Rheem Products (11)

1
Prime

Rheem ProTech 36" Concentric Straight Vent Pipe RTG20270D for Tankless Gas Non-Condensing Water Heaters

Rheem
9.9
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Fast and easy one-step installation
  • Seamless leak-proof gasket design
  • Robust stainless steel build
  • OEM precision for exact fit
  • Versatile 36-inch straight pipe length

Cons

  • Designed specifically for Rheem non-condensing tankless models
  • Fixed 36-inch length may require adapters for custom runs
  • Premium stainless steel suited for professional installs
2
Prime

RW Beckett Replacement Gauge Vial & Gasket Kit for Scully 3/4" Gauges - Precise Fit for Oil Tanks & RVs

Rheem
9.8
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Exact fit for Scully 3/4" gauges
  • Complete kit with vial and gasket
  • High durability for long-term use
  • Simple installation process
  • Maintains gauge accuracy

Cons

  • Fits only 3/4-inch Scully gauges, not larger or KING models
  • Requires measuring gauge diameter before purchase
  • Not a universal replacement
3
Prime

Rheem AP13447-3 OEM Flammable Vapor Sensor for Water Heaters - Genuine Ruud Replacement FV Sensor

Rheem
9.7
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Authentic OEM quality for long-lasting durability
  • Precise flammable vapor detection for optimal safety
  • Direct replacement for Rheem/Ruud water heaters
  • Easy to source as standard HVAC part

Cons

  • Requires matching specific water heater models
  • Professional installation recommended for safety
  • Limited to flammable vapor sensing function only
4
Prime

Rheem RTGH-84DVLN-3 8.4 GPM 157K BTU Indoor Natural Gas Tankless Water Heater - Super Efficient Continuous Hot Water

Rheem
9.6
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • High 8.4 GPM flow supports 3 bathrooms simultaneously
  • Super high efficiency reduces energy use and greenhouse gases
  • Industry-leading slim clearance for easy small-space installs
  • Exclusive features like Water Saver and Hot Start enhance usability
  • Robust warranty: 15 years on heat exchanger

Cons

  • Requires natural gas line and proper venting for indoor use only
  • Needs 120V electrical connection and professional installation recommended
  • Higher initial setup complexity compared to tank models
5
Prime

Rheem RTEX-13 13kW 240V Tankless Electric Water Heater - Endless Hot Water, 99.8% Efficient, Gray

Rheem
9.6
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Exceptional energy efficiency at 99.8%
  • Accurate temperature control with LED display
  • Easy installation and serviceable components
  • Self-modulating power for consistent performance
  • High flow rate for multiple uses

Cons

  • Requires 240V and 54A electrical service, needing professional wiring
  • Best for point-of-use or smaller homes, not whole-house in large setups
  • Higher upfront electrical demands than traditional tank models
6
-9%
Rheem RTG-84XLN-3 Tankless Natural Gas Water Heater: 8.4 GPM Outdoor High Efficiency, 180K BTU for 3-Bath Homes
Prime

Rheem RTG-84XLN-3 Tankless Natural Gas Water Heater: 8.4 GPM Outdoor High Efficiency, 180K BTU for 3-Bath Homes

Rheem
9.6
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • High 8.4 GPM capacity handles 3-bathroom homes during peak demand
  • Up to 34% more efficient than 50-gallon tanks, lowering energy bills
  • Durable outdoor build with easy wall mounting for space savings
  • Exclusive features like Hot Start and water-saving mode enhance daily use

Cons

  • Designed exclusively for outdoor installation, not suitable for indoor use
  • Requires professional qualified installer for safe setup
  • Natural gas only, no liquid propane option for this model
7
Prime

Rheem RTEX-18 18kW 240V Tankless Electric Water Heater - Endless Hot Water, Energy Saving for Whole Home or Showers

Rheem
9.5
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • High flow rate up to 4.4 GPM supports multiple fixtures simultaneously
  • Energy-efficient modulation lowers operating costs compared to tank heaters
  • Easy installation with 3/4-inch NPT connections and no venting needed
  • Sleek gray design fits discreetly in various home locations

Cons

  • Requires 2 x 40 AMP breakers, needing professional electrical upgrade
  • Best for warmer climates like Midwest; lower performance in very cold groundwater areas
  • Higher upfront power demands may not suit all electrical panels
8
Prime

Rheem RTEX-11 11kW 240V Tankless Electric Water Heater - Endless Hot Water, Energy Saving Point-of-Use Unit

Rheem
9.5
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Continuous hot water supply at up to 2.68 GPM
  • Saves energy, money, water, and space versus traditional tanks
  • Self-modulating technology optimizes power usage
  • Simple ON/OFF dial with digital display
  • 1/2-inch NPT connections for straightforward plumbing

Cons

  • Requires 240V circuit and 50A breaker for installation
  • Best suited for point-of-use, not whole-home in cold climates
  • Professional electrical setup recommended
9
Prime

Rheem 6.5kW 240V Tankless Electric Water Heater - Point-of-Use Thermostatic, Endless Hot Water for Sinks & Fixtures

Rheem
9.5
ProductReviews.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductReviews.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Pros & Cons

Pros

  • Compact size frees up storage space
  • Significant energy and water savings
  • Consistent temperature control and fast hot water delivery
  • Durable with 1-year parts and 5-year leak warranty
  • Simple point-of-use setup near fixtures

Cons

  • Limited flow rate suits only 2 sinks, not showers or whole home
  • Requires 240V circuit and 30A breaker for installation
  • Professional electrician recommended for wiring
10
Pros & Cons

Pros

  • High 0.82 EF efficiency cuts energy bills and emissions
  • Powerful 160,000 BTU input handles peak household demand
  • Easy indoor installation in tight spaces
  • Exclusive features like Hot Start and Water Saver enhance daily convenience

Cons

  • Requires professional installation by qualified technician
  • Natural gas fuel type limits flexibility
  • No built-in WiFi for remote monitoring
11
Pros & Cons

Pros

  • Precise temperature sensing for reliable performance
  • OEM quality guarantees perfect compatibility with Rheem models
  • Promotes safer water heater operation
  • Straightforward replacement for targeted maintenance

Cons

  • Compatible only with specific Rheem water heater models
  • May require technical knowledge for installation
  • Limited availability of user feedback

Rheem Brand Guide

Rheem stands as a pinnacle of reliability in the world of water heating, renowned for pioneering tankless technology that delivers continuous hot water on demand. With a focus on efficiency and durability, Rheem offers a diverse lineup of residential tankless water heaters, including both natural gas and electric options designed for indoor and outdoor installations. Homeowners turn to Rheem for solutions that not only meet daily hot water needs but also reduce energy consumption and long-term costs.

Why Rheem Excels in Tankless Water Heaters

Rheem's commitment to innovation shines through in their high-efficiency designs, which activate only when hot water is needed, eliminating standby energy losses common in traditional tank models. This makes them an ideal choice for modern households seeking sustainable home improvements. Their products undergo rigorous testing to ensure consistent performance, even in demanding conditions, earning them a solid reputation among plumbing professionals and DIY enthusiasts alike.

What sets Rheem apart is the blend of advanced engineering and user-friendly features. Many models feature stainless steel heat exchangers for corrosion resistance and longevity, while smart modulation technology adjusts output to match usage, optimizing comfort and efficiency. Whether you're upgrading a single bathroom or outfitting a whole home, Rheem provides scalable solutions that integrate seamlessly into existing plumbing systems.

Product Quality and Reputation

Rheem has built its legacy on superior build quality and dependable operation. Their tankless water heaters are crafted with premium components that withstand years of use, minimizing maintenance needs. Customers appreciate the quiet operation and compact footprints, which allow for flexible installation in tight spaces like closets or under sinks.

The brand's reputation is bolstered by a focus on safety, with built-in features like overheat protection and freeze resistance in select models. This reliability extends to both high-BTU gas units capable of handling multiple fixtures simultaneously and compact electric heaters perfect for point-of-use applications. Rheem's engineering ensures that performance doesn't falter during peak usage, providing peace of mind for families.

Who Are Rheem Water Heaters Best For?

Rheem products cater to a wide audience, from eco-conscious homeowners aiming to lower utility bills to growing families needing abundant hot water without interruption. They're particularly suited for those in regions with hard water, thanks to optional accessories that protect against scale buildup. If you're renovating or building new, Rheem's versatile lineup supports various home sizes and setups.

  • Large households: High-flow gas models handle simultaneous showers and appliances.
  • Small spaces: Electric point-of-use units for sinks or remote fixtures.
  • Energy savers: Non-condensing and condensing options for maximum efficiency.

Explore more options in our comprehensive Water Heaters category to compare Rheem with other leading brands.

Key Rheem Product Categories

Rheem dominates the tankless segment with specialized lines for different needs. Their indoor natural gas models offer powerful BTU outputs for whole-home coverage, while outdoor variants provide easier venting and installation. Electric tankless heaters deliver instant heat without gas lines, ideal for apartments or additions.

Key categories include:

  • High-efficiency non-condensing tankless gas water heaters for indoor and outdoor use.
  • Residential electric tankless models in various kW ratings for flexible power needs.
  • Point-of-use thermostatic units for targeted hot water delivery.

These categories ensure there's a Rheem solution for every scenario. Dive deeper into available models within our Water Heaters selection, where you can filter by type and features.

Installation and Maintenance Insights

Most Rheem tankless heaters are designed for straightforward installation by licensed professionals, with clear manuals and modular components. Regular maintenance, such as annual flushing, keeps them running optimally. Rheem supports users with extensive resources, including troubleshooting guides and compatible parts.

For those considering a switch to tankless, Rheem's flow rates—from 6.5 GPM to 8.4 GPM—match diverse household demands. Pairing with a recirculation system can further enhance convenience.

Frequently Asked Questions

What is the main advantage of Rheem tankless water heaters?

Tankless models from Rheem provide endless hot water by heating it on demand, saving energy compared to tank-style units that constantly maintain heat.

Are Rheem gas and electric water heaters suitable for whole-home use?

Yes, higher-capacity gas models excel for whole-home applications, while electric options work well for smaller homes or supplemental use, depending on your electrical setup.

Can Rheem tankless heaters be installed indoors or outdoors?

Many Rheem models offer both indoor and outdoor configurations, with outdoor units simplifying venting requirements.

How do I choose between Rheem natural gas and electric tankless heaters?

Gas models suit homes with existing lines and higher demands, while electric ones are easier to install without venting and ideal for point-of-use.

Where can I find more Rheem water heater options?

Check out our Water Heaters category for a full range, including Rheem's latest innovations alongside other trusted brands. Additional links to Water Heaters resources help with comparisons.