The Rheem RTG(H)-3: Advanced Tankless Water Heating Solutions for Modern Homes

In the ever-evolving world of home water heating, Rheem’s RTG and RTGH series stand out as cutting-edge solutions. Known for their efficiency, reliability, and user-friendly features, these tankless water heaters cater to a variety of household needs. Whether you’re looking for a compact unit for a small home or a high-capacity system for a bustling household, Rheem’s RTG and RTGH lines have something to offer. Let’s explore the features, technology, and benefits of these impressive water heaters!  

Rheem’s RTG and RTGH series are designed to deliver endless hot water on demand while maximizing energy efficiency. The key distinction between the two lies in their efficiency and technology:  

- RTG Series: Focuses on high efficiency and affordability. Ideal for homeowners seeking reliable performance without advanced condensing technology.  
- RTGH Series: Incorporates condensing technology for ultra-high efficiency, capturing and reusing heat from exhaust gases. Perfect for those prioritizing energy savings and eco-friendliness.  

Rheem RTG Series: Non-Condensing Tankless Water Heaters
The RTG series represents Rheem's line of non-condensing tankless water heaters, known for their reliability and efficiency.

Key Features:

High Efficiency: The RTG series offers high-efficiency performance, ensuring homeowners receive hot water on demand without excessive energy consumption.

Universal Venting Options: These models feature universal venting options, providing flexibility during installation.

Compact Design: Designed with space-saving in mind, the RTG series units are lighter and more compact, simplifying installation in various locations.

Compatibility: The RTG series is compatible with ½-inch gas lines, making them suitable for both new residential constructions and as replacements in existing homes. 

Popular Models:

RTG-70DVLN-3: An indoor model suitable for small to medium households, offering efficient hot water delivery.

RTG-95XLN-3: An outdoor model designed for larger homes, providing higher flow rates to meet increased hot water demands.

Rheem RTGH Series: 

Condensing Tankless Water Heaters

The RTGH series represents Rheem's high efficiency condensing tankless water heaters, utilizing advanced technology to maximize energy savings.

Key Features:

Super High Efficiency: The RTGH series boasts Uniform Energy Factors (UEF) of up to 0.96, reflecting superior energy efficiency and reduced utility costs.

Condensing Technology: By capturing and reusing heat from exhaust gases, these models achieve higher efficiency levels compared to non-condensing units.

Ultra-Low NOx Emissions: Designed with the environment in mind, the RTGH series produces ultra-low NOx emissions, contributing to cleaner air quality. 

Built-In Recirculation Pump: Select models come equipped with a built-in recirculation pump, reducing water waste by delivering hot water more quickly to fixtures.

Popular Models:

RTGH-68DVLN-3: An indoor model ideal for small to medium households, offering efficient hot water delivery with a compact design.

RTGH-95DVLN-3: A high-capacity indoor model suitable for larger homes, providing robust performance to meet substantial hot water needs.

Technology Behind Rheem Tankless Water Heaters

Both the RTG and RTGH lines share core technologies that ensure superior performance:  

1. Condensing Technology (RTGH Models)
Condensing units feature a secondary heat exchanger that captures residual heat from exhaust gases, using it to preheat incoming cold water. This process boosts overall efficiency and lowers gas consumption. These models typically have a Uniform Energy Factor (UEF) of 0.90 or higher, translating to significant energy savings.  

2. Modulating Burner
A standout feature across the RTG and RTGH lines is the modulating gas burner, which automatically adjusts flame size based on water flow and desired temperature. This modulation ensures precise temperature control and prevents the “cold water sandwich” effect—those unpleasant bursts of cold-water during use.  

3. Advanced Flow Control 
Rheem’s proprietary hot start programming keeps the unit in a ready-fire state during short periods of inactivity, ensuring that hot water is available instantly without temperature fluctuations.  

4. Digital Temperature Control
Both lines include easy-to-use digital controls that allow users to set water temperatures with precision. Some models even offer Wi-Fi connectivity, enabling control through Rheem’s EcoNet app for maximum convenience.  

5. Low NOx Burners  
Environmental impact is minimized with Low NOx burners that meet stringent emission standards, making these units compliant in areas with strict air quality regulations.  

Key Features of the RTG and RTGH Models

1. Compact, Space-Saving Design 
These units are compact and can be wall-mounted, making them ideal for homes with limited space. Their sleek design also allows for installation in closets, garages, or utility rooms.  

2. High Flow Rates  
Rheem offers models with varying flow rates to meet different household demands—from around 6 gallons per minute (GPM) for smaller homes to over 9 GPM for larger families or simultaneous multi-point use.  

3. Energy Efficiency  
With UEF ratings ranging from 0.82 in the RTG series to over 0.90 in the RTGH series, these heaters are designed to minimize energy waste and cut down on utility bills.  

4. Built-In Recirculation Pump (Select RTGH Models) 
Some RTGH models include a built-in recirculation pump that reduces wait times for hot water, conserving water and enhancing user comfort.  

5. Freeze Protection  
Ideal for colder climates, many units are equipped with freeze protection, ensuring reliable operation even when outdoor temperatures drop significantly.  

Installation and Maintenance Insights  

Installation Flexibility
- Gas Line Requirements: Most models are compatible with 1/2” gas lines, simplifying retrofit installations.  
- Venting: Condensing models in the RTGH line can use PVC venting, which is more cost-effective than stainless steel. Non-condensing units typically require stainless steel venting.  

Maintenance Tips
- Descale Annually: To prevent mineral buildup, especially in areas with hard water.  
- Inspect and Clean: Regularly check the air intake and exhaust for obstructions.  
- Filter Maintenance: Clean the water filter periodically to maintain optimal flow and efficiency.  

Benefits of Rheem Tankless Water Heaters

1. Endless Hot Water  
Never worry about running out of hot water again—these systems provide continuous hot water as long as there’s demand.  

2. Lower Utility Bills  
With high-efficiency ratings, these water heaters can significantly reduce gas and electricity costs compared to traditional tank models.  

3. Environmental Impact
By using less energy and emitting fewer greenhouse gases, Rheem’s tankless water heaters contribute to a greener home and planet.  

4. Longevity
Built with durable materials and advanced engineering, Rheem’s tankless water heaters can last over 20 years with proper maintenance—outperforming many traditional water heaters.  

5. Versatile Applications 
Suitable for residential, commercial, and even industrial settings, with models that can handle varying scales of hot water needs.  

Rheem’s RTG and RTGH lines offer a versatile and efficient approach to water heating. Whether you’re focused on cutting energy costs, reducing your environmental footprint, or simply want the convenience of endless hot water, these tankless systems are a solid investment. With a range of models tailored to different needs and budgets, there’s a Rheem tankless water heater perfect for every home.