9 Best Rheem Tankless Water Heaters with 8.4 GPM, Compared
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Choosing the best rheem tankless water heaters with 8 4 gpm requires careful comparison of published specifications. We evaluated 9 models to help you find the right unit for your home. The top pick is the Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater, which leads due to its consistent 180,000 BTU/hr output. Our rankings are based strictly on the specs listed on each product page. This guide helps you decide which model fits your fuel type and installation needs.
Quick picks
The best fit for you
- You need the best overall indoor natural gas unit Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater It delivers 180,000 BTU/hr output for reliable multi-bath performance.
- You want the most compact model on the list Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater Its 39.3 pound weight and 20.8 inch height make it the lightest option.
- You want recirculation and Wi-Fi control with propane Rheem IKONIC 8.4 GPM Propane Tankless Heater It pairs high-output propane heating with integrated recirculation and wireless monitoring.
- You need freeze protection for outdoor cold climates Rheem RTG Outdoor Natural Gas Tankless Water Heater It offers freeze protection down to -30 degrees for outdoor setups.
Our 9 picks
Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater
Best for: indoor natural gas homes running multiple bathrooms
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Natural Gas
- BTU
- 180,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater Affiliate link
This Rheem RTG indoor tankless water heater supplies 8.4 GPM at a 35°F temperature rise using natural gas. It delivers 180,000 BTU/hr across a non-condensing direct vent setup with a 0.82 UEF rating. If you run three to four water fixtures at once and want indoor wall mounting, this unit provides precise adjustments down to 1°F from its digital panel.
Pros
- Delivers 8.4 GPM at a 35°F rise with 180,000 BTU/hr heating capacity
- Digital LED control panel allows temperature adjustments within 1°F
- Includes 15-year heat exchanger and 5-year parts warranty coverage
- Equipped with built-in freeze protection and flame failure protection
Cons
- Requires direct venting dedicated to indoor installation
- Non-condensing operation limits efficiency to 0.82 UEF
- Standard configuration lacks built-in Wi-Fi capability
Good fit if
- You have an indoor natural gas line ready for direct venting.
- You need up to 8.4 GPM to run three to four fixtures simultaneously.
- You want precise temperature control dialed in 1°F increments.
Skip if
- You need an outdoor or liquid propane setup.
- You want a condensing unit with a higher UEF rating.
- You require integrated Wi-Fi monitoring.
Verdict: Rheem RTG 8.4 GPM Indoor Natural Gas Tankless Heater delivers consistent 180,000 BTU/hr output for multi-bath indoor homes on natural gas. It provides reliable flow and precise 1°F adjustments in a standard non-condensing format.
Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater
Best for: outdoor natural gas setups needing high capacity
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Natural Gas
- BTU
- 180,000 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater Affiliate link
This Rheem RTG unit is an outdoor tankless water heater running on natural gas. It delivers up to 8.4 GPM at a 35°F temperature rise using 180,000 BTU/hr of input. Designed specifically for outdoor exterior mounting, it eliminates indoor venting requirements entirely. A 0.82 Uniform Energy Factor provides mid-efficiency operation. This setup suits you if your multi-bathroom home has outdoor mounting space and existing natural gas lines ready for connection.
Pros
- 8.4 GPM flow rate at 35°F temperature rise
- 180,000 BTU/hr maximum heat output
- Outdoor installation requires no indoor exhaust venting
- Digital LED control panel with ±1°F temperature adjustments
- 15-year heat exchanger and 5-year parts warranty
Cons
- Outdoor installation only with no indoor mounting support
- Lacks built-in Wi-Fi connectivity
- Non-condensing 0.82 UEF rating is lower than condensing models
Good fit if
- You need up to 8.4 GPM to run 3 to 4 simultaneous showers.
- You want an outdoor installation that eliminates indoor vent piping.
- You have an existing natural gas line ready for connection.
Skip if
- You need an indoor-mounted water heater.
- You use liquid propane rather than natural gas.
- You require smart features or built-in Wi-Fi support.
Verdict: Rheem RTG 8.4 GPM Outdoor Natural Gas Water Heater supplies high hot-water output for multi-bath homes without the need for indoor venting ductwork. It provides reliable exterior performance if your home runs on natural gas and does not require Wi-Fi controls.
Rheem RTGH 8.4 GPM Indoor Natural Gas Heater
Best for: indoor multi-bath homes using natural gas
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Natural Gas
- BTU
- 157,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTGH 8.4 GPM Indoor Natural Gas Heater Affiliate link
This indoor condensing tankless water heater burns natural gas at 157,000 BTU per hour to deliver up to 8.4 GPM at a 35°F rise. It features a 0.93 Uniform Energy Factor, direct vent indoor mounting, and precise digital temperature control within 1°F. If you need steady hot water for three to four simultaneous showers across a multi-bathroom home, this unit gives you high thermal efficiency and continuous output.
Pros
- 0.93 Uniform Energy Factor condensing operation
- Delivers 8.4 GPM at a 35°F temperature rise
- 157,000 BTU per hour burner with direct venting
- Digital LED control with plus or minus 1°F precision
- 15-year heat exchanger and 5-year parts warranty
Cons
- Does not include built-in Wi-Fi connectivity
- Requires dedicated direct venting for indoor use
- Operates only on natural gas, not liquid propane
Good fit if
- You have natural gas and need indoor direct venting.
- You want high 0.93 UEF efficiency to run three to four showers.
- You prefer precise digital temperature control within 1°F.
Skip if
- You need an outdoor installation setup.
- You supply your home with liquid propane fuel.
- You require factory-installed Wi-Fi control.
Verdict: Rheem RTGH Series 8.4 GPM Natural Gas Water Heater provides high 0.93 UEF condensing efficiency for indoor multi-bath natural gas setups. It delivers strong flow and precise temperature regulation without integrated Wi-Fi hardware.
Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor propane whole-home water heating setups
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Liquid Propane
- BTU
- 180,000 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- Digital LED, ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater Affiliate link
This outdoor tankless water heater burns liquid propane to deliver up to 8.4 GPM at a 35°F rise, powered by a 180,000 BTU/hr burner. Its 0.82 UEF non-condensing design mounts directly outside, removing the need for dedicated indoor exhaust venting. It suits you if you run a multi-bathroom home on propane and want an exterior installation that saves interior wall space.
Pros
- Outdoor setup eliminates indoor exhaust venting
- Delivers 8.4 GPM at a 35°F rise with 180,000 BTU/hr output
- Digital LED panel allows temperature adjustments in 1°F increments
- Includes a 15-year heat exchanger and 5-year parts warranty
Cons
- Non-condensing 0.82 UEF rating is lower than condensing models
- Requires liquid propane supply rather than natural gas
- Outdoor-only mounting is not suitable for indoor utility closets
Good fit if
- You need an exterior liquid propane unit that does not require indoor venting.
- You supply hot water for three to four simultaneous showers in moderate climates.
Skip if
- You use natural gas instead of liquid propane.
- You require an indoor installation inside a basement or utility room.
Verdict: Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater provides reliable whole-house hot water output without taking up indoor living space. Its outdoor non-condensing design avoids indoor venting ductwork while serving multiple fixtures simultaneously.
Rheem RTGH Series 8.4 GPM Indoor Propane
Best for: indoor propane homes with multiple bathrooms
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Liquid Propane
- BTU
- 157,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- Digital LED, ±1°F
- Certification
- CSA
View on Amazon: Rheem RTGH Series 8.4 GPM Indoor Propane Affiliate link
This indoor condensing tankless water heater runs on liquid propane and supplies 8.4 GPM at a 35°F rise. Powered by 157,000 BTU/hr, it achieves a 0.93 Uniform Energy Factor using direct vent technology. It delivers enough output for three to four simultaneous showers. If you have an indoor liquid propane setup and need continuous hot water across multiple bathrooms, this model fits your home.
Pros
- 0.93 Uniform Energy Factor condensing efficiency
- 8.4 GPM flow rate at 35°F rise
- Digital LED control with ±1°F temperature accuracy
- 15-year heat exchanger and 5-year parts warranty
- Built-in freeze protection and CSA safety certification
Cons
- Requires liquid propane supply instead of natural gas
- Indoor direct-vent installation only
- Base configuration lacks integrated Wi-Fi
Good fit if
- You use liquid propane for your home fuel supply.
- You need 8.4 GPM capacity for three to four simultaneous showers.
- You want an indoor direct-vent heater with a 0.93 UEF rating.
Skip if
- You require a natural gas connection.
- You want to mount the unit outdoors.
- You prefer built-in Wi-Fi connectivity out of the box.
Verdict: Rheem RTGH 8.4 GPM Indoor Propane Water Heater delivers high-efficiency condensing performance for propane-powered homes requiring multiple simultaneous hot water taps. Its 0.93 UEF rating and 157,000 BTU/hr burner provide reliable indoor direct-vent operation.
Rheem 8.4 GPM Indoor Propane Tankless Water Heater
Best for: indoor propane homes running multiple simultaneous showers
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Liquid Propane
- BTU
- 180,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- Digital LED, ±1°F
- Certification
- CSA
View on Amazon: Rheem 8.4 GPM Indoor Propane Tankless Water Heater Affiliate link
This indoor Rheem RTG unit delivers up to 8.4 GPM at a 35°F temperature rise using liquid propane. It provides 180,000 BTU/hr of heating capacity and holds an energy rating of 0.82 UEF. The wall-mounted non-condensing design features direct venting and digital LED temperature control with 1°F precision. It suits you if your home runs on propane and needs to supply hot water to three or four fixtures simultaneously.
Pros
- 180,000 BTU/hr heat output
- 8.4 GPM flow rate at a 35°F rise
- Digital LED control with plus or minus 1°F adjustments
- 15-year heat exchanger and 5-year parts warranty
- Built-in freeze and flame failure safety protection
Cons
- Lacks built-in WiFi connectivity
- Non-condensing 0.82 UEF efficiency
- Requires dedicated indoor direct venting
Good fit if
- You have an indoor setup that uses liquid propane fuel.
- You need to run three to four fixtures at the same time.
- You prefer push-button temperature adjustments in 1°F increments.
Skip if
- You use natural gas instead of liquid propane.
- You want an outdoor installation that avoids indoor venting work.
- You require built-in WiFi monitoring features.
Verdict: Rheem RTG 8.4 GPM Indoor Propane Tankless Heater delivers 180,000 BTU/hr of on-demand heating for multi-bath homes plumbed for propane. It provides dependable non-condensing operation with digital temperature controls.
Rheem IKONIC 8.4 GPM Propane Tankless Heater
Best for: Propane homes wanting recirculation and Wi-Fi control
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Liquid Propane
- BTU
- 157,000 BTU/hr
- Installation Location
- Indoor
- Dimensions
- 28.6 x 17.3 x 13.7 inches
- Features
- WiFi
View on Amazon: Rheem IKONIC 8.4 GPM Propane Tankless Heater Affiliate link
This indoor condensing unit delivers up to 8.4 GPM using liquid propane and a 157,000 BTU burner. It includes built-in recirculation to cut the wait time for hot water and built-in Wi-Fi for phone-based monitoring. If your home runs on propane and needs simultaneous hot water for multiple fixtures like showers and sinks without adding external recirculation hardware, this setup provides a self-contained indoor solution.
Pros
- Built-in recirculation pump reduces wait time for hot water
- Integrated EcoNet Wi-Fi tracks usage and allows mobile control
- Compact chassis requires only 0.5-inch side-to-side clearance
- Ultra-low NOx burner lowers greenhouse gas emissions
Cons
- Requires an optional conversion kit for outdoor installation
- Weighs 86 pounds, requiring sturdy wall mounting
- Designed strictly for liquid propane, not natural gas
Good fit if
- You use liquid propane as your home fuel source.
- You want built-in recirculation without installing an external pump.
- You prefer mobile app management for water heater temperatures and alerts.
Skip if
- You need a natural gas connection rather than propane.
- You plan to mount the unit outdoors without purchasing conversion accessories.
Verdict: Rheem IKONIC 8.4 GPM Propane Heater with Recirculation pairs high-output propane heating with integrated recirculation and wireless monitoring. It serves multi-fixture indoor layouts that require steady supply without separate auxiliary pumps.
Rheem IKONIC 8.4 GPM Natural Gas Water Heater
Best for: indoor natural gas tank-to-tankless retrofits
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Natural Gas
- BTU
- 157,000 BTUs
- Installation Location
- Indoor
- Dimensions
- 28.6 x 17.3 x 13.7 inches
- Weight
- 77.6 pounds
View on Amazon: Rheem IKONIC 8.4 GPM Natural Gas Water Heater Affiliate link
This indoor condensing tankless water heater delivers up to 8.4 GPM using natural gas and a 157,000 BTU burner. It features dual heat exchangers and supports flex venting alongside standard half-inch gas lines, which simplifies tank replacements. If you need whole-house continuous hot water from a natural gas hookup without re-piping larger gas lines, this indoor unit fits your setup.
Pros
- Dual heat exchangers for condensing operation
- Compatible with 1/2-inch gas lines and flex venting
- 157,000 BTU maximum heat input with 8.4 GPM flow rate
- 15-year limited warranty
Cons
- Indoor installation only
- Natural gas only, not compatible with liquid propane
- Unit weighs 77.6 pounds
Good fit if
- You have an indoor natural gas supply with a 1/2-inch line.
- You want an 8.4 GPM flow rate backed by a 15-year limited warranty.
- You plan to replace an existing tank heater using flex venting.
Skip if
- You need an outdoor water heater installation.
- You use liquid propane instead of natural gas.
Verdict: Rheem IKONIC 8.4 GPM Indoor Natural Gas Heater provides 157,000 BTUs and 8.4 GPM with flexible venting options for indoor installations. It suits natural gas households that require straightforward retrofits using existing half-inch gas lines.
Rheem RTG Outdoor Natural Gas Tankless Water Heater
Best for: outdoor natural gas installations in cold climates
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Natural Gas
- Installation Location
- Outdoor
- Dimensions
- 23.6 x 13.9 x 13.9 inches
- Weight
- 54 pounds
View on Amazon: Rheem RTG Outdoor Natural Gas Tankless Water Heater Affiliate link
This outdoor natural gas unit delivers up to 8.4 GPM while consuming 157,000 BTU per hour. It features built-in freeze protection rated to -30 degrees and Hot Start Programming to prevent cold water bursts. Because it mounts outside, you avoid indoor venting runs entirely. It suits households that use natural gas and need multi-fixture hot water performance in cold climates without taking up interior utility space.
Pros
- Delivers an 8.4 GPM flow rate using 157,000 BTU per hour
- Freeze protection rated down to -30 degrees
- Hot Start Programming minimizes cold water bursts
- Ready for an optional recirculation pump kit
Cons
- Outdoor installation only
- Requires a dedicated natural gas line
Good fit if
- You need an exterior-mounted heater that runs on natural gas.
- You live in an area where temperatures drop down to -30 degrees.
- You want an 8.4 GPM flow rate without dedicating interior space to venting.
Skip if
- You need an indoor water heater.
- You use liquid propane rather than natural gas.
Verdict: Rheem 8.4 GPM Outdoor Natural Gas Tankless Water Heater delivers steady high-capacity flow for outdoor setups, backed by freeze protection down to -30 degrees. It is a solid choice if you want to free up indoor space while maintaining reliable natural gas output.
Specifications side by side
| Spec | Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater | Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater | Rheem RTGH 8.4 GPM Indoor Natural Gas Heater | Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater | Rheem RTGH Series 8.4 GPM Indoor Propane | Rheem 8.4 GPM Indoor Propane Tankless Water Heater | Rheem IKONIC 8.4 GPM Propane Tankless Heater | Rheem IKONIC 8.4 GPM Natural Gas Water Heater | Rheem RTG Outdoor Natural Gas Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas | Natural Gas | Natural Gas | Liquid Propane | Liquid Propane | Liquid Propane | Liquid Propane | Natural Gas | Natural Gas |
| Flow Rate | 8.4 GPM | 8.4 GPM | 8.4 GPM | 8.4 GPM at 35°F rise | 8.4 GPM at 35°F rise | 8.4 GPM at 35°F rise | 8.4 GPM | 8.4 GPM | 8.4 GPM |
| BTU | 180,000 BTU/hr | 180,000 BTU/hr | 157,000 BTU/hr | 180,000 BTU/hr | 157,000 BTU/hr | 180,000 BTU/hr | 157,000 BTU/hr | 157,000 BTUs | not stated |
| Installation Location | Indoor | Outdoor | Indoor | Outdoor | Indoor | Indoor | Indoor | Indoor | Outdoor |
| Temperature Control | ±1°F | ±1°F | ±1°F | Digital LED, ±1°F | Digital LED, ±1°F | Digital LED, ±1°F | not stated | not stated | not stated |
| Certification | CSA | CSA | CSA | CSA | CSA | CSA | not stated | not stated | not stated |
| Dimensions | 24.2 x 13.5 x 10.3 inches | 20.8 x 13.5 x 9.4 inches | 23.7 x 17.7 x 9.8 inches | 20.8 x 13.5 x 9.4 inches | 23.7 x 17.7 x 9.8 inches | 24.2 x 13.5 x 10.3 inches | 28.6 x 17.3 x 13.7 inches | 28.6 x 17.3 x 13.7 inches | 23.6 x 13.9 x 13.9 inches |
| Venting Type | Non-Condensing | Non-Condensing | not stated | Non-Condensing | not stated | Non-Condensing | not stated | not stated | not stated |
| Features | not stated | WiFi | WiFi | WiFi | WiFi | WiFi | WiFi | not stated | not stated |
| Weight | 46.5 pounds | 39.3 pounds | 59.9 pounds | 39.3 pounds | 59.9 pounds | 46.5 pounds | 86 pounds | 77.6 pounds | 54 pounds |
| Size | 8.4 GPM (Standard) | 8.4 GPM (No WiFi) | 8.4 GPM (No WiFi) | 8.4 GPM (Non-WiFi) | 8.4 GPM (Without WiFi) | 8.4 GPM (No WiFi) | 8.4 GPM (w Recirc) | 8.4 GPM | not stated |
| Color | Gray | Gray | Gray | Gray | Gray | Gray | Gray | Gray | Gray |
| Model | RTG-84DVLN-3 | RTG-84XLN-3 | RTGH-84DVLN-3 | RTG-84XLP-3 | RTGH-84DVLP-3 | RTG-84DVLP-3 | RECTGH-SR84iP | RECTGH-S84iN | RTG-84XLN-1 |
For lower fixture demand, you can compare flow rates in the best categories with 4 0 gpm.
How to choose the right one
-
Match fuel to supply
Confirm your home uses natural gas or propane before comparing models. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater requires a natural gas line. If you have propane, select the Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater. Using the wrong fuel type prevents ignition and damages the unit. Check your existing gas connection type. Ensure your supply pressure matches the unit requirements. Do not mix fuel sources. This is the first step in selection.
-
Decide installation location
Choose between indoor and outdoor placement based on your space. Indoor units need proper venting and clearances. The Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater is built for exterior walls. It saves indoor space and avoids ductwork. Outdoor models resist weather elements. Indoor models protect internal components from freezing. Verify local codes for placement. Consider accessibility for maintenance. Your location choice dictates the venting method and unit durability.
-
Check venting needs
Venting type affects installation complexity and efficiency. Non-condensing units use standard vents. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater uses this format. Condensing models capture heat from exhaust. The Rheem RTGH 8.4 GPM Indoor Natural Gas Heater offers higher efficiency. Condensing units often require specific PVC venting. This changes installation costs. Match the venting type to your existing infrastructure. Non-condensing is simpler. Condensing saves energy. Choose based on your home setup.
-
Verify flow capacity
All models here deliver 8.4 GPM. This flow rate supports multiple bathrooms. It handles simultaneous showers and sinks. Check if you need recirculation. The Rheem IKONIC 8.4 GPM Propane Tankless Heater includes integrated recirculation. This feature reduces wait times for hot water. It adds convenience for large homes. Other models lack this hardware. You may need an external pump. Confirm your fixture count. 8.4 GPM suits most whole-house needs. Verify peak demand matches this capacity.
-
Assess physical dimensions
Measure your installation space carefully. Units vary in size and weight. The outdoor propane model weighs 39.3 pounds. The indoor condensing propane unit weighs 59.9 pounds. The IKONIC propane model is heaviest at 86 pounds. Ensure your wall or pad supports the weight. Check width and height clearances. The indoor natural gas unit is 13.5 inches wide. Larger models need more space. Plan for service access. Measure before purchasing to avoid fit issues.
Frequently asked questions
What is the difference between the RTG and RTGH Rheem models?
The RTG series uses non-condensing technology, while the RTGH series features condensing efficiency with a 0.93 UEF rating. Condensing models are slightly heavier and larger due to their heat exchanger design. You should choose RTGH for higher efficiency in indoor installations. Select RTG if you prefer a lighter, more compact unit for outdoor or standard indoor use.
Can I use these tankless heaters in freezing outdoor temperatures?
Yes, the outdoor Rheem RTG 8.4 GPM Natural Gas Water Heater includes freeze protection down to -30 degrees. This feature helps prevent internal damage when installed outside in cold climates. Other outdoor propane models also support exterior installation. Always verify the specific model’s climate ratings before placing the unit in unheated environments during winter.
Do all 8.4 GPM Rheem models include Wi-Fi connectivity?
No, connectivity varies by model. The outdoor natural gas and propane units lack integrated Wi-Fi hardware. Some indoor models also omit this feature. However, the Rheem IKONIC series includes wireless monitoring capabilities. You must check the specific attributes for each model to confirm if remote control features are included in your chosen unit.
Which Rheem 8.4 GPM heater is best for propane homes?
The Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater is a strong choice for outdoor setups. For indoor use, the Rheem RTGH Series 8.4 GPM Indoor Propane offers high condensing efficiency. The Rheem IKONIC 8.4 GPM Propane Heater adds recirculation features for steady hot water delivery. Select based on your need for efficiency versus convenience features.
How do the dimensions compare between indoor and outdoor Rheem units?
Indoor models are generally taller and wider to accommodate venting components. For example, the RTGH indoor units measure 17.7 inches wide and 23.7 inches tall. Outdoor units are more compact, often standing 20.8 inches tall and 13.5 inches wide. The IKONIC series is the largest, measuring 28.6 inches in height. Measure your installation space carefully before purchasing.
What venting options are available for indoor Rheem tankless heaters?
Indoor natural gas models typically use non-condensing venting, requiring standard exhaust ductwork. The RTGH series uses condensing technology with direct-vent operation for higher efficiency. Some models support flexible venting configurations for easier retrofits. Always follow the manufacturer’s installation guidelines for vent pipe sizing and clearance to ensure safe and efficient operation in your home.
Is recirculation built into the Rheem 8.4 GPM heaters?
Most standard models do not include built-in recirculation pumps. The Rheem IKONIC 8.4 GPM Propane Heater is an exception, featuring integrated recirculation for immediate hot water. Other units require a separate auxiliary pump for recirculation functionality. If you want hot water instantly at the tap without running the main unit’s recirculation cycle, the IKONIC series is your best option.