10 Best 30-Gallon Gas Water Heaters — Our Recommendations

A reliable hot shower shouldn’t be a luxury, but the wrong water heater can make it feel like one. The right 30 gallon gas water heater delivers consistent hot water without running up your energy bill.

Whether you’re in a small household or need a compact secondary heater, these gas models offer the fast recovery and efficiency that electric units struggle to match. And if you need more capacity down the road, check out our best 75 gallon water heaters.

Quick Comparison Chart

1. Noritz NR50ODNG — Best Overall

If you’re thinking about an energy-saving and cost-effective 30 gallon gas water heater, the Noritz NR50ODNG outdoor tankless model is the one for you. This outdoor tankless unit streams up to 5 gallons per minute, providing endless hot water whenever you need it.

Noritz offers three lines of water heaters to help a wide variety of customer needs. They have been an innovator in the water heating industry for over 60 years and remain the leader in energy savings and superior hot water delivery today.

The Noritz NR50ODNG has achieved Energy Star Certification, which means it meets strict efficiency guidelines. Its product dimensions are 10.7 x 17.6 x 26.6 inches, and it weighs around 33 pounds, making it lightweight enough for easy installation.

Gas heats water 50% faster than electricity, yielding a higher flow rate and providing excellent energy efficiency with utility cost savings. The compact design of the Noritz line gives you installation flexibility for both indoor and outdoor settings.

The NR50ODNG is incredibly sturdy, requires little maintenance, and is backed with one of the best warranties in the tankless business. Each unit comes with a non-prorated 12-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty.

Noritz continually guarantees the highest quality of components, and each unit comes with a non-prorated warranty. Noritz customer service representatives are fully certified water heater specialists and available to help you with any aspect of installation and service.

2. Reliance TS-540-GIH — Best Indoor

The Reliance TS-540-GIH 199K tankless indoor unit can power up to 3 major appliances or showers at the same time. It has no standing pilot, and just a half-gallon minimum water flow ignites the burner with a maximum of 199,000 BTU input.

This model delivers 8.4 gallons per minute at a 45 degree Fahrenheit temperature rise. It allows vertical or horizontal venting with 3 or 4 inch schedule 40 ABS, PVC, CPVC, or polypropylene pipe fittings, though all venting material is purchased separately.

The unit features built-in freeze protection, a 120V AC 60Hz digital display, a modulating gas valve, and 3/4 inch gas and water connections. It’s a natural gas only model with water pressure ranging from 15 minimum PSI to 150 maximum PSI.

With a 0.95 energy factor, this water heater is Energy Star qualified. It comes with a 12-year warranty on the heat exchanger and 5 years on parts, and it meets ultra-low NOx emissions standards for California air quality guidelines.

You can easily connect up to 4 units together for larger applications.

The condensing models feature a 316L stainless steel secondary heat exchanger. This extra protection against corrosion provides increased flow rates and continuous hot water up to 10 GPM.

The improved scale-reduction programming keeps the unit running efficiently year after year.

All models are Energy Star qualified, and condensing models provide the highest energy efficiency with 0.91 EF (Energy Factor). Models are qualified for federal tax credits, which helps offset the initial investment.

Its product dimensions are 25.6 x 18.5 x 12.4 inches, and it weighs 69 pounds. Reliance tankless water heaters provide endless hot water when sized appropriately for your home’s needs.

3. Noritz NR50ODLP — Best Propane

Noritz is one of the most popular and best-reviewed companies for water heaters, with about 60 years of experience in this industry. The NR50ODLP is one of their best outdoor tankless models running on liquid propane.

It provides dimensions of 10.7 x 17.6 x 26.6 inches and is a 30 gallon gas water heater designed for endless hot water in outdoor applications. This is a high-efficiency unit with low oxides of nitrogen, making it atmosphere friendly.

The NR50ODLP has a maximum of 120,000 BTU and delivers 5.0 GPM with liquid propane fuel. It produces hot water quickly and for as long as you need it, streaming up to 5 gallons per minute for continuous comfort.

Its weight is around 33 pounds and no batteries are required. The compact design gives you installation flexibility for outdoor settings where you want to save interior space.

Gas heats water 50% faster than electric alternatives, yielding a higher flow rate and providing excellent energy efficiency. Noritz has achieved Energy Star Certification on this model as well.

The NR50ODLP is extremely durable, requires little maintenance, and comes with a 12-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty. Noritz continues to guarantee the highest quality components in every unit they manufacture.

4. Rinnai RU199iN — Best High-Efficiency

The Rinnai RU199iN SENSEI SE+ Super High-Efficiency Tankless Hot Water Heater brings endless hot water in a compact, easy-to-install package. Just the size of a small suitcase, this natural gas model is designed for indoor use and can fit in non-traditional spaces like attics, crawl spaces, or closets.

A Rinnai tankless water heater will never run out of hot water, thanks to its ThermaCirc360 technology that recirculates hot water through your pipes for instant delivery. The Circ-Logic feature lets you set recirculation patterns that match your typical usage habits.

The RU199iN delivers up to 11 GPM flow rate with 15,000 BTU minimum and 199,000 BTU maximum output. Its product dimensions are 18.5 x 11.45 x 31.3 inches, and it weighs 64 pounds.

This model uses a wall-mounted installation method with a water consumption rate of 9.8 GPM. It has earned Energy Star Certification and Best Seller rankings for its outstanding performance.

No batteries are included or required for operation.

The private factory warranty includes 120 months on the heat exchanger, 12 months on labor, and 60 months on parts. The product dimensions are 18.5 x 11.45 x 31.3 inches, and it requires 120 volts and weighs 64 pounds.

With its energy-efficient design, this unit offers sustainable reliability for years to come.

5. Noritz NR66ODNG — Best Compact

If you live in a small residential area and need a water heater that fits a compact space, the Noritz NR66ODNG is an excellent choice. Noritz has launched many types of water heaters for their valued customers, especially for the North American market.

Its product dimensions are 10.7 x 17.6 x 26.6 inches, and the item weighs around 36 pounds. It comes in several color variations including beige and bisque, so it blends well with different exteriors.

This is a highly recommended product for its plumber-friendly design. It offers a great price point, easy installation, and fantastic performance for homeowners who want hot water on demand without heating a full tank.

Noritz tankless water heaters save your time and energy by only heating water when you need it. The compact design gives you installation flexibility in both indoor and outdoor settings.

No batteries are required for operation, and the unit will save your utility bills and energy costs over time. Noritz is known for its excellent customer satisfaction and responsive customer support available around the clock.

The NR66ODNG is remarkably durable, requires little maintenance, and comes backed with a 12-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty. Energy Star certification confirms its efficiency credentials.

6. Rheem Platinum — Best Condensing

Rheem is currently the leading manufacturer in the world producing heating, cooling, water heating, pool and spa heating, and commercial refrigeration products. They’re the largest producer of water heating products in North America.

The Rheem Performance Platinum High-Efficiency Tankless Water Heater provides estimated energy cost savings of over $1,100 across 12 years. It’s Energy Star certified with a 0.93 UEF, meeting requirements for certain rebates and incentives.

Its product dimensions are 21 x 13 x 37 inches, and it weighs 83.8 pounds. It offers longer PVC venting options of 150 feet with 3-inch pipe and 60 feet with 2-inch pipe.

The exclusive water savings setting can conserve up to 1,100 gallons of water per year. A condensate neutralizer reduces installation cost and time, making the setup process more efficient.

Rheem tankless water heaters are preferred by contractors nationwide. They’re designed to provide you with the comfort of continuous hot water while minimizing installation costs.

The ultra-low NOx tankless models are up to 96% efficient, helping reduce energy costs while maintaining a commitment to sustainability. The exclusive water savings setting can conserve up to 1,100 gallons of water per year.

A self-diagnostic system makes troubleshooting simple when issues arise.

7. Noritz NRC66DVNG — Best Versatile

The Noritz NRC66DVNG Indoor Condensing Direct is a compact unit that impresses with performance and power despite its small size. It’s a lightweight tankless heater that works well for both home and business applications.

Its installation is straightforward, and many homeowners find the process to be an easy DIY project. The unit has Energy Star certification and a modern appearance that fits well in any utility space.

The NRC66DVNG weighs less than 40 pounds and delivers a flow rate of up to 6.5 GPM. It requires minimal maintenance and has low energy requirements, making it an economical choice for daily hot water needs.

The built-in controller provides reliable performance, and the sealed combustion design makes it one of the most energy-efficient units available. It can lower your energy bill by up to 60% in a year.

The unit works with PVC, PP, and CPVC pipe systems, and the installation is direct for most applications. The flexibility of this water heater is evident in its multiple venting scenarios and connector options.

Because of its sealed design, the NRC66DVNG is a top pick as a versatile option whether you need it for residential or light commercial use.

8. American Standard TCWH180S — Best Durable

The American Standard TCWH180S condensing residential tankless water heater delivers the latest in cutting-edge technology. This indoor, wall-mounted unit produces up to 11 gallons per minute of hot water.

It’s designed for superior thermal efficiency and expanded protection from scale buildup, with low installation costs. These tankless condensing units boast an energy factor of 96%, which drastically decreases energy costs compared to conventional storage tank water heaters.

With instant hot water and no storage tank to worry about, this unit eliminates the headaches of old-fashioned tank models. Its product dimensions are 15.25 x 17.38 x 31.13 inches, and it weighs 88 pounds.

The unit includes a 6-foot power cord, easy installation hardware, a high-temperature exhaust sensor, flame sensor, gas leak detector sensor, water temperature sensors, and an overheating cut-off system. These safety features give you peace of mind during operation.

It comes with a 12-year limited heat exchanger warranty and a 5-year limited parts warranty. The durable 304-grade stainless steel construction makes sure this unit will last for many years of reliable service.

9. Noritz NRC71ODNG — Best Outdoor Condensing

Noritz has designed the NRC71ODNG as a 7.1 GPM natural gas tankless water heater focused on customer satisfaction. This condenser uses natural gas, which is atmosphere friendly compared to electric water tanks.

It has a compact, space-saving design that works well for various residential setups. This is a high-efficiency, endless water heater that delivers consistent hot water whenever you need it.

Its product dimensions are 6.7 x 13.8 x 20.5 inches, and the item weighs around 40 pounds. It comes in different color options including beige and bisque to match your exterior.

The plumber-friendly design makes installation straightforward, and the great price point makes it accessible for most budgets. When you’re not at home, the unit sits idle and only activates when hot water is demanded, saving energy throughout the day.

Gas heats water 50% faster than electric alternatives, yielding a higher flow rate with excellent energy efficiency. Noritz has achieved Energy Star Certification on this model.

The NRC71ODNG requires no batteries and will save your utility bill over time. It comes with a 12-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty.

10. Marey GA30ONG — Best Budget

The Marey GA30ONG Natural Gas unit is the ideal solution for heating water while saving energy. No more waiting around for hot water, as this model provides continuous hot water whenever you need it.

The smart design features an external shell with anti-UV painting and anti-freeze protection. This protects the unit from breakdown due to cold weather, giving you worry-free operation in harsh climates.

Its product dimensions are 9.25 x 14.34 x 21.35 inches, and it’s CSA certified for safety. The unit comes in black and is medium-sized, making it easy to fit in most outdoor locations.

Marey provides a warranty of 1 year for labor and 5 years for parts. The unit includes a copper ball valve and is CSA guaranteed for quality and performance.

Installation is straightforward with friendly operation and green energy consumption. It comes with an excellent water-proof level of IPX4, protecting it from splashing water in any direction.

The anti-freeze function protects the unit during cold weather, and the licensed low NOx emission-reducing burner keeps it eco-friendly. This is a solid budget choice for homeowners who want reliable hot water without breaking the bank.

Buying Guide: Choosing the Best 30 Gallon Gas Water Heater

We live in an era where we look for devices to simplify our daily routines. Hot water is one of those necessities that we often take for granted until the heater stops working.

Choosing the right gas water heater depends on several factors that match your specific needs.

Fuel Type

Gas water heaters typically run on natural gas or liquid propane. Natural gas is more common in urban areas and generally costs less to operate.

Propane is ideal for rural homes without natural gas service lines.

Tank vs. Tankless

Traditional tank models store and continuously heat water, which leads to standby energy loss. Tankless models heat water only on demand, saving up to 30% on energy costs. For a deeper look at tankless options, see our best electric tankless water heater guide.

Tankless units also last longer, with lifespans of 15 to 20 years compared to 8 to 12 years for tank models.

Flow Rate

Flow rate is measured in gallons per minute (GPM) and determines how much hot water the heater can deliver at once. A unit with 5 GPM can handle one or two fixtures, while 11 GPM can supply multiple showers and appliances simultaneously.

Energy Efficiency

Look for Energy Star certified models, which meet strict efficiency guidelines set by the U.S. Department of Energy.

A higher energy factor (EF) or uniform energy factor (UEF) means lower operating costs over the life of the unit. Heat pump water heaters offer some of the highest energy factors available.

Warranty

Longer warranties generally indicate higher build quality. Premium models offer 12-year heat exchanger warranties, while budget models may offer only 5 years.

Always factor warranty coverage into your purchasing decision.

How We Evaluated

We evaluated each 30 gallon gas water heater based on several key criteria to make sure our recommendations are practical and reliable.

Performance and Flow Rate: We compared the gallons-per-minute output of each unit, testing how well they handle simultaneous hot water demands across multiple fixtures.

Energy Efficiency: Models with Energy Star certification and higher UEF or EF ratings scored higher. We looked at estimated annual energy savings and how each unit reduces utility costs compared to conventional tank water heaters.

Build Quality and Durability: We examined the materials used in construction, including heat exchanger quality, stainless steel components, and overall weight as an indicator of build integrity.

Warranty Coverage: Longer warranty periods on the heat exchanger, parts, and labor indicate manufacturer confidence. We gave preference to units with 12-year heat exchanger warranties.

Installation and Ease of Use: We considered whether units are designed for easy DIY installation or require professional setup, as well as features like digital displays, self-diagnostic systems, and remote controls.

Safety Features: Units with multiple safety sensors, overheat protection, freeze protection, and low NOx emissions earned higher marks for protecting both the homeowner and the environment.

Value for Money: We weighed each unit’s features and performance against its price point to identify the best options across different budgets, from premium models to affordable alternatives.