10 Best Tankless Water Heaters with 8.4 GPM, Compared
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Finding the best tankless water heaters with 8 4 gpm requires careful attention to installation requirements and fuel type. We compared 10 models using only the specifications published on their listings. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater leads this list because it delivers 180,000 BTU output for reliable indoor whole-home natural gas installations. This guide helps you decide which unit fits your home’s layout and energy source. You will see how venting, size, and efficiency ratings differ across each option. Focus on the data that matches your specific plumbing and gas connections.
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 output for reliable indoor whole-home performance.
- You want the most compact model on the list Camplux 8.4 GPM Outdoor Propane Tankless Water Heater Its 6.5-inch width and 6.5-inch length are the smallest dimensions here.
- You need built-in recirculation for indoor propane setups Rheem IKONIC 8.4 GPM Propane Tankless Heater It pairs built-in recirculation with Wi-Fi monitoring for indoor propane use.
- You need freeze protection down to -30 degrees Rheem RTG Outdoor Natural Gas Tankless Water Heater Its built-in freeze protection ensures operation in freezing outdoor climates.
Our 10 picks
Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater
Best for: indoor whole-home natural gas installations
- 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
The Rheem RTG is an indoor natural gas tankless water heater engineered for whole-house supply. It delivers up to 8.4 GPM at a 35°F temperature rise using a 180,000 BTU burner, supporting three to four fixtures simultaneously. Featuring a 0.82 UEF rating and direct-vent design, it provides continuous hot water for multi-bathroom homes that already utilize natural gas.
Pros
- Supplies 8.4 GPM at a 35°F rise via a 180,000 BTU burner
- Digital LED control panel adjusts temperature in ±1°F increments
- Includes built-in freeze protection and flame failure safety features
- Compact wall-hung frame measuring 24.2 by 13.5 by 10.3 inches
Cons
- Requires direct venting hardware for indoor installation
- Energy efficiency is limited to a 0.82 UEF non-condensing rating
Good fit if
- You have a dedicated natural gas line and need indoor direct-vent mounting.
- You run up to three or four hot water fixtures at the same time.
- You want digital temperature adjustments with single-degree precision.
Skip if
- You rely on liquid propane rather than a natural gas supply line.
- You need an outdoor-mounted water heater to avoid cutting indoor vent runs.
- You want a condensing unit with an efficiency rating higher than 0.82 UEF.
Verdict: Rheem RTG 8.4 GPM Indoor Natural Gas Tankless Heater provides 180,000 BTU output for indoor residential setups with existing natural gas hookups. It serves multi-bath demands reliably with precise single-degree temperature settings.
Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater
Best for: outdoor setups needing multi-bath natural gas 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
This outdoor natural gas tankless water heater delivers up to 8.4 GPM at a 35°F temperature rise using 180,000 BTU/hr. Because you mount it outside, it eliminates indoor venting requirements. With a 0.82 Uniform Energy Factor and digital temperature control precise to 1°F, it suits households needing simultaneous hot water for multiple bathrooms without taking interior wall space.
Pros
- Outdoor installation eliminates the need for indoor venting
- Delivers 8.4 GPM at a 35°F temperature rise
- Digital LED panel provides temperature control accurate to ±1°F
- 180,000 BTU/hr natural gas heating capacity
Cons
- Requires outdoor wall mounting
- Lower 0.82 UEF rating compared to condensing alternatives
Good fit if
- You have an exterior wall location and want to avoid installing indoor venting.
- You run natural gas and need hot water for three to four simultaneous fixtures.
Skip if
- You need an indoor-mounted unit or use liquid propane.
- You want a higher-efficiency condensing unit.
Verdict: Rheem RTG 8.4 GPM Outdoor Natural Gas Water Heater provides high flow for multiple bathrooms while removing the need for indoor venting.
Rheem RTGH 8.4 GPM Indoor Natural Gas Heater
Best for: large homes needing efficient indoor 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
This indoor condensing tankless water heater delivers up to 8.4 GPM at a 35°F temperature rise using natural gas. Powered by a 157,000 BTU burner with a 0.93 Uniform Energy Factor, it supports three to four simultaneous showers. If you need steady hot water for a multi-bathroom home, its direct-vent indoor design and digital temperature control with precision adjustments to within one degree provide exact output.
Pros
- Delivers 8.4 GPM at a 35°F rise via a 157,000 BTU natural gas burner
- 0.93 Uniform Energy Factor condensing operation
- Digital LED control with ±1°F temperature precision
- 15-year heat exchanger and 5-year parts warranty coverage
Cons
- This 8.4 GPM size configuration lacks built-in WiFi
- Direct-vent indoor design requires dedicated interior venting space
Good fit if
- You have an indoor natural gas hookup and space for direct venting.
- You need to run three to four showers simultaneously in a multi-bathroom home.
- You want high condensing efficiency with a 0.93 UEF rating.
Skip if
- You require liquid propane fuel or an outdoor installation.
- You want built-in WiFi controls included on this specific unit.
Verdict: Rheem RTGH 8.4 GPM Indoor Natural Gas Heater provides high condensing efficiency and 8.4 GPM flow for multi-bath indoor setups. Its precise digital temperature control and 157,000 BTU output deliver dependable whole-home hot water.
Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor propane installations needing high flow
- 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
This Rheem RTG outdoor tankless water heater runs on liquid propane and delivers up to 8.4 GPM at a 35°F temperature rise. Its 180,000 BTU burner and non-condensing design carry a 0.82 UEF rating. Because you install it outdoors, it eliminates indoor exhaust venting runs. It suits multi-bathroom homes using propane fuel that need whole-house hot water capacity without indoor venting hardware.
Pros
- Delivers 8.4 GPM at a 35°F temperature rise with 180,000 BTU/hr output
- Outdoor installation requires no indoor exhaust venting
- Digital LED control panel allows temperature adjustments in ±1°F steps
- Includes 15-year heat exchanger and 5-year parts warranty coverage
Cons
- Requires a liquid propane supply rather than natural gas
- Non-condensing 0.82 UEF rating is lower than condensing units
- Lacks integrated Wi-Fi connectivity
Good fit if
- You have an exterior wall location that eliminates indoor venting requirements.
- You use liquid propane and need up to 8.4 GPM for multiple simultaneous fixtures.
- You want push-button digital temperature adjustments down to 1°F increments.
Skip if
- You require an indoor installation or use a natural gas utility connection.
- You want integrated Wi-Fi app monitoring and control.
Verdict: Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater delivers 180,000 BTU/hr output for multi-shower households without requiring indoor venting ducts. It provides dedicated propane performance with straightforward digital temperature controls.
Rheem RTGH Series 8.4 GPM Indoor Propane
Best for: Indoor propane homes needing multiple showers
- 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
This indoor tankless water heater burns liquid propane to supply 8.4 GPM at a 35°F temperature rise. Its condensing design uses 157,000 BTU/hr and achieves a 0.93 Uniform Energy Factor. It fits your household if you run up to three to four fixtures at once and vent indoors. You control settings through an onboard digital LED interface accurate to within 1°F.
Pros
- 0.93 Uniform Energy Factor condensing operation
- Delivers 8.4 GPM at 35°F rise via 157,000 BTU/hr
- Digital LED control with ±1°F precision
- Integrated freeze protection system
Cons
- Requires dedicated indoor direct venting
- Does not include WiFi connectivity
- Operates only on liquid propane
Good fit if
- You have an indoor utility space configured for direct venting.
- You run your household on liquid propane rather than natural gas.
- You require up to 8.4 GPM to operate three to four showers simultaneously.
Skip if
- You use natural gas for your home utilities.
- You need an outdoor-mounted water heater.
- You want integrated wireless app control out of the box.
Verdict: Rheem RTGH Series 8.4 GPM Indoor Propane provides high-efficiency condensing output for homes requiring multiple simultaneous hot water fixtures. Its 0.93 UEF rating and 157,000 BTU burner deliver steady indoor performance on dedicated propane lines.
Camplux 8.4 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor propane setups needing 199,000 BTU
- Flow Rate
- 8.4 GPM (what this guide is about)
- Fuel Type
- Propane
- BTU
- 199,000 BTU/hr
- Installation Location
- Outdoor
- Voltage
- 120 V
- Temperature Control
- ±0.5°F
View on Amazon: Camplux 8.4 GPM Outdoor Propane Tankless Water Heater
This Camplux outdoor tankless water heater burns liquid propane to provide up to 8.4 GPM. Rated at 199,000 BTU, it heats water between 95°F and 167°F for four to eight fixtures simultaneously. The unit mounts outside to preserve interior space and includes a 32.8-foot remote for indoor operation. It suits your home if you need high heat output from an exterior propane supply.
Pros
- 199,000 BTU heating capacity with up to 8.4 GPM flow rate
- Includes 32.8-foot remote for indoor temperature control
- Starts at low water pressure of 0.02 MPa
- Precise water temperature management within ±0.5°F
Cons
- Outdoor installation only
- 84% thermal efficiency rating
- 1-year limited warranty
Good fit if
- You need an exterior liquid propane unit delivering 199,000 BTU.
- You want to adjust water temperature from inside via a wired remote.
- You operate fixtures in an area with low water pressure down to 0.02 MPa.
Skip if
- You require an indoor installation or natural gas fuel.
- You want a warranty period longer than one year.
Verdict: Camplux 8.4 GPM Outdoor Propane Tankless Water Heater provides 199,000 BTU of exterior heating capacity for multiple simultaneous fixtures. The bundled 32.8-foot remote and low 0.02 MPa start pressure make it practical for outdoor propane installations.
Rheem 8.4 GPM Indoor Propane Tankless Water Heater
Best for: indoor multi-bath homes running on liquid propane
- 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
This indoor liquid propane tankless water heater delivers up to 8.4 GPM at a 35°F rise using a 180,000 BTU burner. Its non-condensing design features a 0.82 Uniform Energy Factor and direct venting. You can adjust water temperatures in single-degree increments on the digital LED display. It suits multi-bathroom households that use propane fuel and need simultaneous hot water across three to four fixtures indoors.
Pros
- Delivers 8.4 GPM at a 35°F temperature rise via 180,000 BTU input
- Digital LED panel allows precision temperature adjustments of ±1°F
- 15-year heat exchanger and 5-year parts warranty coverage
- Built-in freeze protection and flame failure safety systems
Cons
- Lacks built-in WiFi connectivity
- Requires dedicated indoor direct-vent routing
- 0.82 UEF rating reflects non-condensing operation
Good fit if
- You have an indoor installation space set up for liquid propane.
- You need to run three to four fixtures simultaneously at an 8.4 GPM rate.
- You want direct LED temperature control with one-degree adjustments.
Skip if
- You use natural gas instead of liquid propane for your fuel source.
- You require an outdoor installation or integrated WiFi connectivity.
Verdict: Rheem RTG 8.4 GPM Indoor Liquid Propane Heater delivers reliable high-capacity output with precise digital controls for homes using liquid propane. Its direct-vent indoor configuration easily handles multi-fixture demand without requiring wireless networking.
Rheem IKONIC 8.4 GPM Propane Tankless Heater
Best for: indoor propane homes wanting built-in recirculation
- 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
This indoor condensing tankless water heater runs on liquid propane and delivers up to 8.4 GPM with a 157,000 BTU/hr burner. It features built-in recirculation to cut down wait times at fixtures, alongside built-in EcoNet Wi-Fi for mobile app control and tracking. If you need a whole-home propane unit with integrated pump support and smart monitoring, this unit fits indoor setups with compact side clearances.
Pros
- Delivers 8.4 GPM flow rate using 157,000 BTU/hr
- Built-in recirculation system to minimize wait times
- Integrated EcoNet Wi-Fi for app-based controls and alerts
- Compact half-inch side-to-side clearance requirement
Cons
- Outdoor placement requires a separate conversion kit
- Total unit weight is 86 pounds
Good fit if
- You supply your home with liquid propane instead of natural gas.
- You want integrated recirculation without plumbing in an external pump.
- You want mobile Wi-Fi controls for temperature and usage monitoring.
Skip if
- You have a natural gas hookup rather than propane.
- You want an outdoor setup without buying an optional conversion kit.
Verdict: Rheem IKONIC 8.4 GPM Propane Tankless Heater pairs built-in recirculation with mobile Wi-Fi monitoring for indoor propane setups. It delivers strong 8.4 GPM flow while allowing tight half-inch side wall clearances.
Rheem IKONIC 8.4 GPM Natural Gas Water Heater
Best for: indoor tank retrofits on natural gas
- 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
The Rheem IKONIC 8.4 GPM Indoor Natural Gas Water Heater is an indoor condensing unit delivering up to 8.4 GPM from a 157,000 BTU burner. You get dual heat exchangers, compatibility with existing half-inch gas lines, and multiple venting options including room air intake and flex venting. At 77.6 pounds, it suits indoor replacements where you want continuous hot water across simultaneous fixtures without resizing your gas supply line.
Pros
- Delivers 8.4 GPM using a 157,000 BTU burner
- Connects directly to standard 1/2-inch gas lines
- Supports flex venting, room air intake, and long vent runs
- Features dual heat exchangers and a 15-year limited warranty
Cons
- Restricted to indoor installations only
- Operates exclusively on natural gas without propane support
- Weighs 77.6 pounds and requires structural wall mounting
Good fit if
- You need 8.4 GPM flow for multiple indoor fixtures on natural gas.
- You are replacing a storage tank using an existing 1/2-inch gas line.
- You require flexible venting paths such as room air intake or long vent runs.
Skip if
- You need an outdoor-mounted water heater.
- You use liquid propane instead of natural gas.
- You require an integrated recirculation pump in the base unit.
Verdict: Rheem IKONIC 8.4 GPM Indoor Natural Gas Water Heater provides whole-home capacity and versatile venting options for indoor installations using existing half-inch gas lines.
Rheem RTG Outdoor Natural Gas Tankless Water Heater
Best for: freezing outdoor climates using natural gas
- 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
This unit provides an 8.4 GPM flow rate powered by natural gas at 157,000 BTU per hour. It mounts outdoors and includes freeze protection down to -30 degrees. Hot Start Programming reduces cold-water bursts, while recirculation kit support is built in. If you need high flow from an exterior natural gas heater for cold weather, this suits you.
Pros
- Delivers up to 8.4 GPM flow rate
- Consumes 157,000 BTU per hour using natural gas
- Freeze protection rated down to -30 degrees
- Hot Start Programming minimizes cold water bursts
- Recirculation pump kit ready
Cons
- Outdoor installation only
- Operates only on natural gas, not propane
Good fit if
- You have an exterior installation location with natural gas supply lines.
- You need freeze protection for temperatures down to -30 degrees.
- You require an 8.4 GPM continuous hot water flow rate.
Skip if
- You require an indoor-mounted water heater.
- You rely on liquid propane fuel instead of natural gas.
Verdict: Rheem RTG Outdoor Natural Gas Tankless Water Heater provides 8.4 GPM flow and 157,000 BTU output for exterior mounting. Its built-in freeze protection down to -30 degrees ensures operation in freezing climates.
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 | Camplux 8.4 GPM Outdoor Propane Tankless Water Heater | 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 | 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 | 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 | 199,000 BTU/hr | 180,000 BTU/hr | 157,000 BTU/hr | 157,000 BTUs | not specified |
| Installation Location | Indoor | Outdoor | Indoor | Outdoor | Indoor | Outdoor | Indoor | Indoor | Indoor | Outdoor |
| Voltage | not specified | not specified | not specified | not specified | not specified | 120 V | not specified | not specified | not specified | not specified |
| Temperature Control | ±1°F | ±1°F | ±1°F | Digital LED, ±1°F | Digital LED, ±1°F | ±0.5°F | Digital LED, ±1°F | not specified | not specified | not specified |
| Certification | CSA | CSA | CSA | CSA | CSA | CSA, UL | CSA | not specified | not specified | not specified |
| 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 | 22.2 x 6.5 x 6.5 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 specified | Non-Condensing | not specified | not specified | Non-Condensing | not specified | not specified | not specified |
| Features | not specified | WiFi | WiFi | WiFi | WiFi | not specified | WiFi | WiFi | not specified | not specified |
| Weight | 46.5 pounds | 39.3 pounds | 59.9 pounds | 39.3 pounds | 59.9 pounds | 40.8 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) | 6.86 GPM-LP | 8.4 GPM (No WiFi) | 8.4 GPM (w Recirc) | 8.4 GPM | not specified |
| Color | Gray | Gray | Gray | Gray | Gray | White | Gray | Gray | Gray | Gray |
| Model | RTG-84DVLN-3 | RTG-84XLN-3 | RTGH-84DVLN-3 | RTG-84XLP-3 | RTGH-84DVLP-3 | WA686LP | RTG-84DVLP-3 | RECTGH-SR84iP | RECTGH-S84iN | RTG-84XLN-1 |
Is 8.4 GPM the right flow rate for your home?
An 8.4 GPM rating supports multiple simultaneous fixtures, such as two showers and a kitchen sink. This capacity suits large households with high demand. Smaller units, like the Camplux model listed at 6.86 GPM, may struggle during peak usage. If you have fewer bathrooms or lower usage, this high flow is unnecessary. Choose 8.4 GPM only if your plumbing and fuel supply can handle the load.
Worth it if
- You have multiple bathrooms running water at the same time
- You need whole-home hot water for large families
- You want to avoid temperature drops during peak usage
Skip it if
- You have only one bathroom or low usage
- Your gas lines cannot support high BTU input
- You prefer a smaller, less expensive unit
If you also run outdoor equipment, you can compare flow rates for the best pressure washers with 4 0 gpm.
How We Selected These Units
We identified these models by scanning Amazon listings for the specific 8.4 GPM flow rate. This metric defines the maximum water volume each unit delivers, which is critical for whole-home comfort. We included only the primary variant for each product family to keep the comparison focused on distinct performance tiers. All data comes directly from published specification sheets and feature lists on the product pages. We do not handle or test these units personally. The selection relies strictly on the manufacturer's stated capabilities for flow and energy output.
How to Choose the Right Unit
-
Match Your Fuel Source
Your existing gas lines determine which heater fits. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater requires a natural gas hookup. If you use propane, choose the Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater. The Camplux WA686LP also runs on propane. Verify your supply type before buying. Using the wrong fuel type prevents operation. Ensure your home has the correct gas line connection for the specific model you select.
-
Select Installation Location
Decide if you need indoor or outdoor mounting. Indoor units, like the Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater, require proper venting and space. Outdoor models, such as the Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater, handle weather exposure. The Camplux WA686LP is also designed for exterior use. Indoor units often need more clearance. Outdoor units save interior space. Check your available area and climate conditions to pick the right location for your setup.
-
Check Venting Requirements
Venting needs vary by model and location. Indoor natural gas units like the Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater use non-condensing venting. Condensing models, such as the Rheem RTGH 8.4 GPM Indoor Natural Gas Heater, offer higher efficiency but different venting. Outdoor units generally do not require indoor ducts. Review the venting type in the specs. Proper venting ensures safe operation. Incorrect venting can cause safety hazards. Match the venting system to your home’s existing infrastructure or plan for new installation.
-
Verify BTU Output
Higher BTU output supports better performance. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater provides 180,000 BTU. The Camplux WA686LP offers 199,000 BTU. The Rheem RTGH 8.4 GPM Indoor Natural Gas Heater delivers 157,000 BTU. Higher BTU helps maintain temperature at high flow. Check the BTU rating in the attributes. Ensure the output matches your hot water demand. Adequate heating power prevents temperature drops during use. Compare BTU figures to find the right power level for your household.
-
Consider Recirculation Features
Built-in recirculation saves water and time. The Rheem IKONIC 8.4 GPM Propane Tankless Heater includes this feature. It allows hot water to circulate instantly. Other models may not have built-in recirculation. You might need an external pump. Check the specs for recirculation support. This feature reduces wait time for hot water. It also improves efficiency by reducing waste. Decide if you want integrated recirculation or a separate system. This choice affects installation complexity and water usage.
-
Review Physical Dimensions
Size matters for installation space. The Camplux WA686LP is compact, measuring 6.5 inches wide. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater is larger at 13.5 inches wide. The Rheem IKONIC 8.4 GPM Propane Tankless Heater is taller at 28.6 inches. Measure your available space before buying. Ensure the unit fits your designated area. Consider clearance requirements for maintenance. Compare width, height, and length specs. Proper sizing ensures a secure and accessible installation. Check dimensions to avoid fitting issues.
-
Check WiFi Connectivity
WiFi allows remote monitoring and control. Some Rheem models, like the RTG 8.4 GPM Outdoor Natural Gas Tankless Heater, include WiFi. Others, such as the Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater, may not. Check the features list for WiFi support. Remote access helps you adjust settings from anywhere. It can also provide diagnostic information. Decide if you need smart features. WiFi-enabled units offer convenience but may require a network connection. Verify connectivity options before purchasing.
Frequently asked questions
Can an 8.4 GPM tankless heater run two showers at once?
Yes, an 8.4 GPM flow rate supports multiple simultaneous fixtures. This capacity suits large households with high demand, such as two showers and a kitchen sink. Models like the Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater deliver 180,000 BTU output to maintain steady performance during peak usage times.
Do I need special venting for indoor natural gas models?
Indoor natural gas units require specific venting configurations. The Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater uses non-condensing venting. In contrast, condensing models like the Rheem RTGH 8.4 GPM Indoor Natural Gas Heater offer higher efficiency but may have different venting requirements for your installation.
Which 8.4 GPM heater is best for outdoor use?
Outdoor units eliminate the need for indoor venting ducts. The Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater provides high flow for multiple bathrooms while removing the need for indoor venting. It is designed for exterior mounting and includes features like built-in freeze protection for cold climates.
Is WiFi connectivity standard on all 8.4 GPM heaters?
No, WiFi is not standard on every model. Some units, like the Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater, include WiFi for remote monitoring. Others, such as the Rheem RTG 8.4 GPM Indoor Natural Gas Water Heater, do not list this feature in their specifications. Check the attributes carefully.
What is the smallest footprint among these 8.4 GPM units?
The Camplux 8.4 GPM Outdoor Propane Tankless Water Heater has the most compact dimensions. It measures 6.5 inches in width and 6.5 inches in length. This small size makes it practical for tight outdoor spaces, unlike larger indoor models that can exceed 17 inches in width.
Can I use propane instead of natural gas for an 8.4 GPM unit?
Yes, dedicated propane models are available for both indoor and outdoor setups. The Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater delivers 180,000 BTU/hr output for multi-shower households. Indoor propane options, like the Rheem IKONIC 8.4 GPM Propane Tankless Heater, also provide strong flow with built-in recirculation features.
Do any 8.4 GPM heaters include built-in recirculation?
Yes, some models include built-in recirculation for instant hot water. The Rheem IKONIC 8.4 GPM Propane Tankless Heater pairs built-in recirculation with mobile Wi-Fi monitoring. This feature allows for tight half-inch side wall clearances and ensures steady indoor performance without waiting for water to heat up in the pipes.