Looking Beyond the Noritz NR98SVNG 7.5 GPM Indoor/Outdoor? 6 Alternatives Worth a Look

Comparing Noritz NR98SVNG Alternatives

Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater

The Rinnai RUS75eN delivers 7.5 GPM and includes a 12-year heat exchanger warranty. Unlike the Noritz NR98SVNG, which allows indoor or outdoor mounting, this model is built strictly for exterior installation. Its dimensions measure 14.5 inches wide, 35 inches high, and 22 inches long, making it substantially larger than the 23.6-inch-tall Noritz. You lose the indoor installation versatility and dual-unit Quick Connect cord linking of the original. However, you gain a dedicated outdoor chassis with venting compatibility engineered to supply up to six fixtures simultaneously. Choose this Rinnai model if your project requires exterior-only placement and you want a long manufacturer warranty on the heat exchanger.

Noritz 7.5 GPM Outdoor Natural Gas Water Heater

The Noritz NR98-OD NG provides 7.5 GPM flow and 199,000 BTU of heating performance with a sensitive 0.05 GPM activation rate. Unlike the Noritz NR98SVNG, which supports indoor placement alongside outdoor options, this model functions purely as an exterior heater. Eliminating indoor capability removes the need for indoor venting runs entirely. You give up the dual indoor-outdoor flexibility and the included 6-foot power cord and remote thermostat bundle found on the NR98SVNG. You should pick the NR98-OD NG instead if you know your water heater will reside permanently on an outside wall and you need ultra-low flow activation for continuous hot water delivery during low-demand tasks.

Ranein 8.5 GPM Outdoor Natural Gas Water Heater

The Ranein RHO19K-NG weighs 44 pounds, making it 10 pounds lighter than the 54-pound Noritz NR98SVNG. It features standard 3/4-inch connections and an 8.5 GPM capacity rating. While the Noritz installs indoors or outdoors, the Ranein is restricted to outdoor placement and specifies operation below 2,000 feet elevation. You give up the commercial-grade copper piping, unit-linking capabilities, and indoor venting choices provided by the Noritz. However, its lighter chassis simplifies exterior mounting brackets. You should choose the Ranein model if your home sits below 2,000 feet elevation, requires outdoor-only installation, and needs standard 3/4-inch connections for feeding multiple household fixtures without the bulk of a 54-pound heater.

Rinnai 7.6 GPM Outdoor Natural Gas Water Heater

The Rinnai REU-VE2737WD-US-N offers a 7.6 GPM flow rating and non-condensing exterior heating with built-in LED diagnostic monitoring. At 53.3 pounds, its weight closely matches the 54-pound Noritz NR98SVNG. However, its cabinet measures 10.8 inches in length compared to the 13.8-inch depth of the Noritz, offering a slightly shallower profile. You lose the indoor installation choice and quick-connect pairing found on the Noritz, as this Rinnai model is strictly outdoor-rated. In return, you get direct visual feedback from the integrated diagnostic display. Choose this unit instead if you need an exterior non-condensing water heater capable of supplying up to six fixtures with clear onboard troubleshooting readouts.

APUS 190,000 BTU Outdoor Natural Gas Water Heater

The APUS AP-AWH-W26NG delivers 8.1 GPM and 190,000 BTU while weighing 42.5 pounds, notably lighter than the 54-pound Noritz NR98SVNG. It has a significantly slimmer form factor at 6.54 inches wide and 6.54 inches long, compared to the 10.6-inch width and 13.8-inch length of the Noritz. It also features app-based temperature management. What you give up is the Noritz unit's indoor installation capability, thick commercial-grade copper heat exchanger, and dual-unit linking. Pick the APUS if you have limited exterior wall space, prefer managing water temperature via mobile app, and need an 8.1 GPM flow rate for high-demand outdoor natural gas applications.

Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater

The Rheem RTG-95XLN-3 delivers a 9.5 GPM flow rate, coming closest to the 9.8 GPM maximum flow of the Noritz NR98SVNG. It weighs 39.3 pounds and measures 20.8 inches tall by 9.4 inches deep, making it nearly 15 pounds lighter and more compact than the 54-pound Noritz. It also includes WiFi functionality. You sacrifice the indoor mounting adaptability of the Noritz, as the Rheem is engineered solely for outdoor, non-condensing use. You also give up the QC-2 cord linking capability. Choose the Rheem RTG-95XLN-3 if you have high hot water demand across multiple simultaneous showers and want a lighter, outdoor-specific heater with WiFi integration.

Quick picks

Our 7 picks

1 Best overall

Noritz 9.8 GPM Natural Gas Tankless Water Heater

Best for: high-flow indoor or outdoor natural gas installations

Fuel Type

Natural Gas

Flow Rate

9.8 GPM

Installation Location

Indoor/Outdoor

Dimensions

13.8 × 10.6 × 23.6 inches

Weight

54 pounds

View on Amazon: Noritz 9.8 GPM Natural Gas Tankless Water Heater

This Noritz unit is a natural gas tankless water heater designed for indoor or outdoor setup. It delivers flow rates up to 9.8 GPM and features a commercial-grade copper heat exchanger with 25 percent thicker piping. The package includes a remote thermostat and a six-foot power cord. You can link two units together using a quick-connect cord. It suits you if you need high-capacity domestic hot water from natural gas.

Pros

• Delivers flow rates up to 9.8 GPM
• Commercial-grade copper heat exchanger with 25% thicker piping
• Includes remote thermostat and 6-foot power cord
• Supports linking two units via QC-2 Quick Connect Cord

Cons

• Requires natural gas connection
• Unit weighs 54 pounds

Good fit if

• You need flow rates up to 9.8 GPM.
• You have an indoor or outdoor natural gas hookup.
• You plan to link two units for extra hot water capacity.

Skip if

• You require a liquid propane or electric power source.
• You need a lightweight unit under 50 pounds.

Verdict: Noritz Indoor/Outdoor Natural Gas Tankless Water Heater delivers flow rates up to 9.8 GPM with commercial-grade copper piping. It provides flexible indoor or outdoor installation options along with dual-unit linking capability.

2 Also great

Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater

Best for: outdoor natural gas setups needing 7.5 GPM

Fuel Type

Natural Gas

Flow Rate

7.5 GPM

Installation Location

Outdoor

Dimensions

35 x 14.5 x 22 inches

View on Amazon: Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater

This Rinnai natural gas tankless water heater delivers a flow rate of up to 7.5 GPM for outdoor setups. It supports up to six appliances at once and measures 35 by 14.5 by 22 inches. You also get flexible venting options like PVC or CPVC using an adaptor. It suits you if you need an outdoor natural gas unit backed by a 12-year heat exchanger warranty.

Pros

• Delivers a maximum flow rate of 7.5 GPM
• Serves up to 6 appliances simultaneously
• Supports PVC and CPVC venting with a dedicated adaptor
• Includes a 12-year heat exchanger warranty

Cons

• Requires professional installation per manufacturer guidelines
• Labor warranty coverage is limited to 1 year
• Requires an adaptor for PVC and CPVC venting setups

Good fit if

• You need an outdoor natural gas unit providing up to 7.5 GPM
• You run up to 6 hot water fixtures at the same time
• You want 12 years of residential heat exchanger warranty coverage

Skip if

• You plan to self-install without a professional technician
• You require an indoor natural gas model without purchasing extra hardware

Verdict: Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater delivers strong flow for running up to six fixtures at once. Its flexible venting compatibility and 12-year heat exchanger warranty make it a dependable outdoor natural gas option.

3 Best premium

Noritz 7.5 GPM Outdoor Natural Gas Water Heater

Best for: outdoor natural gas setups needing high capacity

Fuel Type

Natural Gas

Flow Rate

7.5 GPM

BTU

199,000 BTU

Installation Location

Outdoor

View on Amazon: Noritz 7.5 GPM Outdoor Natural Gas Water Heater

This outdoor natural gas tankless water heater delivers up to 7.5 GPM using a 199,000 BTU burner. Because it mounts outdoors, you do not need dedicated indoor venting pipe. It features an onboard computer with self-diagnostics and activates at 0.05 GPM. With an 84% thermal efficiency rating, this beige outdoor unit suits you if you want direct exterior setup.

Pros

• High heating capacity rated at 199,000 BTU
• Requires no venting due to outdoor-only design
• Low activation flow rate of 0.05 GPM
• Built-in self-diagnostic onboard computer system

Cons

• Restricted to outdoor installation only
• Thermal efficiency is limited to 84%
• Operates strictly on natural gas without dual-fuel options

Good fit if

• You want an outdoor installation that eliminates the need for venting.
• You need a natural gas unit capable of delivering 7.5 GPM at 199,000 BTU.
• You run fixtures with low flow rates down to 0.05 GPM.

Skip if

• You need to install your water heater indoors.
• You run your home appliances on liquid propane instead of natural gas.
• You require an efficiency rating higher than 84%.

Verdict: Noritz 7.5 GPM Outdoor Natural Gas Tankless Heater delivers 199,000 BTU of exterior heating performance with zero indoor venting needed. Its 0.05 GPM activation and 7.5 GPM output make it reliable for outdoor natural gas setups.

4 Best budget

Ranein 8.5 GPM Outdoor Natural Gas Water Heater

Best for: Multi-fixture outdoor setups below 2,000 feet elevation

Fuel Type

Natural Gas

Flow Rate

8.5 GPM

BTU

190,000 BTU/hr

Installation Location

Outdoor

Dimensions

24.3 x 15.1 x 8.1 inches

Weight

44 pounds

View on Amazon: Ranein 8.5 GPM Outdoor Natural Gas Water Heater

The Ranein outdoor natural gas tankless water heater delivers up to 8.5 GPM with a 190,000 BTU heating capacity. It connects via standard 3/4-inch NPT fittings and supports four to six plumbing fixtures simultaneously. If you need a high-capacity exterior unit for a whole-house setup and live below 2,000 feet elevation, this compact 44-pound model gives you continuous hot water without requiring indoor venting space.

Pros

• High 190,000 BTU rating supporting up to 8.5 GPM
• Standard 3/4-inch NPT water and gas connections
• Bottom-mounted blower with automatic speed adjustment
• Integrated anti-freeze protection system

Cons

• Outdoor installation only
• Not recommended for locations above 2,000 feet elevation
• Requires manual draining via pressure relief valve when idle in freezing weather

Good fit if

• You need an exterior natural gas unit to supply 4 to 6 outlets
• You live at an elevation below 2,000 feet
• You have standard 3/4-inch NPT utility connections in place

Skip if

• You require an indoor water heater installation
• You live at an elevation above 2,000 feet
• You run on liquid propane instead of natural gas

Verdict: Ranein 8.5 GPM Outdoor Natural Gas Water Heater supplies high-volume hot water for multiple fixtures from an exterior mount. It serves homes below 2,000 feet that need outdoor placement with standard 3/4-inch connections.

5 Also great

Rinnai 7.6 GPM Outdoor Natural Gas Water Heater

Best for: outdoor setups running up to six fixtures

Fuel Type

Natural Gas

Flow Rate

7.6 GPM

Installation Location

Outdoor

Dimensions

24.6 x 14.1 x 10.8 in

Venting Type

Non-Condensing

Weight

53.3 pounds

View on Amazon: Rinnai 7.6 GPM Outdoor Natural Gas Water Heater

This Rinnai unit is a non-condensing natural gas tankless water heater built strictly for outdoor installation. It delivers a flow rate of up to 7.6 GPM, allowing you to supply up to six fixtures at once. A compact cabinet measuring 24.6 by 14.1 by 10.8 inches saves wall space outside your home, while an integrated LED screen displays service reminders and error codes to simplify maintenance for your household.

Pros

• Delivers up to 7.6 GPM flow rate to supply up to six fixtures at once
• Built-in LED screen provides service reminders and diagnostic error codes
• Compact outdoor profile measuring 24.6 by 14.1 by 10.8 inches
• Warranty offers up to 15 years on heat exchanger and 5 years on parts and labor

Cons

• Requires a separate Controlr module for WiFi connectivity
• Does not include an internal recirculation pump
• Engineered only for outdoor installation

Good fit if

• You need an exterior natural gas unit capable of running up to six fixtures
• You want on-unit LED alerts for service reminders and troubleshooting
• You have an outdoor mounting space of at least 24.6 by 14.1 inches

Skip if

• You require an indoor tankless water heater installation
• You want built-in recirculation without buying an upgraded model
• You need integrated WiFi functionality without buying extra accessories

Verdict: Rinnai 7.6 GPM Outdoor Natural Gas Tankless Heater provides dependable exterior hot water generation capable of feeding six fixtures at once. It suits homes seeking a compact, non-condensing natural gas setup with straightforward LED diagnostic monitoring.

6 Also great

APUS 190,000 BTU Outdoor Natural Gas Water Heater

Best for: high-demand outdoor natural gas setups

Fuel Type

Natural Gas

Flow Rate

8.1 GPM

BTU

190,000 BTU

Installation Location

Outdoor

Voltage

120V AC

Temperature Control

95°F–149°F, ±1°F

View on Amazon: APUS 190,000 BTU Outdoor Natural Gas Water Heater

The APUS 8.1 GPM Outdoor Natural Gas Tankless Water Heater delivers up to 190,000 BTU for exterior home installations. It provides an 8.1 GPM flow rate with a 0.79 GPM minimum activation threshold and an energy factor of 0.81 UEF. You can manage temperatures between 95°F and 149°F using the wired controller or the Tuya app. This unit suits households needing high-demand outdoor hot water delivery across multiple fixtures.

Pros

• 8.1 GPM flow rate powered by a 190,000 BTU burner
• Digital controls via Tuya app or wired remote from 95°F to 149°F
• Low 0.79 GPM minimum activation flow rate
• Standard 3/4-inch gas and water connections

Cons

• Outdoor installation only
• Non-condensing 0.81 UEF rating
• Limited to a 2-year component warranty

Good fit if

• You need an outdoor natural gas heater delivering up to 8.1 GPM.
• You want mobile app or wired remote control over water temperature.
• You have standard 3/4-inch gas and water plumbing lines.

Skip if

• You require an indoor water heater installation.
• You want higher thermal efficiency than a 0.81 UEF rating.
• You need warranty coverage extending beyond two years.

Verdict: APUS 8.1 GPM Outdoor Natural Gas Tankless Water Heater provides high-volume exterior water heating with app-based temperature management. Its 190,000 BTU burner and 8.1 GPM output handle multiple fixtures without occupying interior wall space.

7 Best 9.5 gpm

Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater

Best for: outdoor multi-shower natural gas demand

Fuel Type

Natural Gas

Flow Rate

9.5 GPM

BTU

199,900 BTU/hr

Installation Location

Outdoor

Temperature Control

±1°F

Certification

CSA

View on Amazon: Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater

This Rheem RTG outdoor tankless water heater runs on natural gas and delivers 9.5 GPM at a 35°F rise with a 199,900 BTU input. It mounts outside, eliminating indoor venting runs, and operates at a 0.82 Uniform Energy Factor. If you need higher flow for 3 to 4 simultaneous showers without indoor equipment footprint, this non-condensing unit gives you precision digital control in a compact 39.3-pound cabinet.

Pros

• 9.5 GPM maximum flow rate powered by 199,900 BTU/hr
• Outdoor wall mounting eliminates indoor exhaust venting requirements
• Digital LED control panel supports precision ±1°F adjustments
• 15-year heat exchanger and 5-year parts warranty coverage

Cons

• Outdoor-only installation restricts indoor placement
• Non-condensing 0.82 UEF rating offers lower efficiency than condensing units
• Base configuration lacks built-in Wi-Fi connectivity

Good fit if

• You need up to 9.5 GPM to run 3 to 4 showers at once.
• You prefer an exterior wall mount to avoid indoor venting runs.
• You have a natural gas supply line capable of 199,900 BTU/hr.

Skip if

• You require an indoor water heater installation.
• You want higher efficiency than a non-condensing 0.82 UEF design provides.

Verdict: Rheem RTG 9.5 GPM Outdoor Natural Gas Heater provides high flow capacity and precise temperature adjustments for homes needing multi-shower output without indoor venting runs.

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