Best Commercial Tankless Water Heaters

Best Commercial Tankless Water Heaters

When you’re on the hunt for the best commercial tankless water heater, you’re likely looking for a high BTU unit that offers an impressive flow rate. We’ve checked out the span of reputable tankless water heater manufacturers and have compiled our list of models that we think will fit the bill. In a comparison of good commercial tankless water heaters, we think we’ve drilled down to the important benefits to give you a great overview of the most important details.

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  • RL75eN
  • Brand: Rinnai
  • Dimensions: 9.3 x 14 x 23 inches
  • GPM: 7.5
  • Weight: 50.6 pounds
  • Warranty: Manufacturers

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  • IR4000
  • Brand: SuperGreen
  • Dimensions: 14 x 6 x 20 inches
  • GPM: 2.2 GPM
  • Weight: 25 pounds
  • Warranty: Manufacturers

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  • RUC98iN
  • Brand: Rinnai
  • Dimensions: 10 x 18.5 x 26 inches
  • GPM: 9.8 GPM
  • Weight: 82 pounds
  • Warranty: Manufacturers

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  • RL94iN
  • Brand: Rinnai
  • Dimensions: 9.3 x 14 x 23 inches
  • GPM: 9.4 GPM
  • Weight: 50 pounds
  • Warranty: Manufacturers

1. Rinnai RL75eN Natural Gas Tankless Water Heater

commercial-tankless-water-heaters-1This Rinnai unit is for external, outdoor installation only, so it would work best in a warm climate that is moderately protected from bad weather elements, and especially not in an area that ever freezes. Its natural gas energy source and its 7.5 gallons per minute (GPM) water flow capacity puts it in the reasonable lower range for price.

The RL75eN gas range is from 10,300-180,000 BTU and has an Energy Factor (EF) of 0.82. It is a direct electronic ignition and the gas and water line connections are all ¾ inch pipe connections, but are compatible with ½ inch lines.

The RL95eN is also engineered with an enhanced scale detection protection, so it will help reduce the possibility of damage to the unit and parts. Even so, it wouldn’t hurt to install external filters or water softeners if you have hard water in your area.

Rinnai has created an integrated, trademarked Circ-Logic recirculation program, which essentially cycles an external pump at pre-set intervals and temperatures to reduce strain on the water heater and keep your water at comfortable temperature levels. For a residential setting, the RL75eN comes standard with a digital controller, and the temperature can be controlled from 85-140°F. For a commercial setting, you must purchase a separate commercial controller for temperatures of 98-185°F.

As far as the warranty goes, Rinnai gives a 12-year warranty on its heat exchanger, offers 5 years on parts, and a 1-year labor warranty for residential installations.

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2. SuperGreen IR4000 Infrared Electric Tankless Water Heater

commercial-tankless-water-heaters-2Now this IR4000 is something very special. As the name indicates, SuperGreen has created what they call the world’s only infrared hot water systems. The IR4000 does not have a heating coil or element, but instead uses high-power quartz heating elements that are eco-friendly. The biggest benefit to you the consumer is that your water will have no direct contact with any heating elements inside the unit, thus increasing the unit’s lifespan. As an added perk, the four redundant far-infrared heating elements also have a self-cleaning design, for a maintenance-free operation. That is a big difference from most tankless water heaters that require a vinegar flush or cleaning every 6 months to a year.

You can expect a maximum of 2.2 GPM with the IR400, and it is commercial grade. For warm climates, the SuperGreen IR4000 can heat water for one shower and a sink at the same time. This one-of-a-kind electric tankless water heater is also very efficient, operating at 99% thermal efficiency. You can also be thankful for a zero NOx guarantee. For install, you will have about 25 pounds to mount, and the IR4000 runs about 14” wide by 20” high by 6” deep.

Some of the nitty details: it uses a maximum of 9 kilowatts of power, and runs on 220 volt service. The inlet and outlet pipe fittings are ¾ inch. You must have a minimum household electrical service of 125 amps to run the IR4000. You need a 40 amp double-pole breaker and will need to run #8 wire. You can use this system for everything from a hybrid setup to extend the life of your tank, to using this for solar heat backup, radiant heating or hydronic heating.

Customer service at SuperGreen is based in the USA and is readily available to talk about any sizing or installation questions. If you have any questions about the best product choice for your residential or commercial setup, contact their support team. As far as price goes—you won’t find a cheaper unit on our commercial list.

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3.Rinnai RUC98iN Concentric/Twin Pipe Natural Gas Tankless Water Heater

commercial-tankless-water-heaters-3The RUC98iN falls squarely in the middle of our price range for the best commercial tankless water heaters. Its features make users rave about its options. Rinnai is pretty proud of the fact that they are the only water tank manufacturer to offer two installation options in one unit—saving you the hassle of buying extra parts, and saving lots of time on a retrofit in a tight space. This Rinnai tankless water heater offers two options for natural gas venting—both concentric and PVC pipe options are found on the top of the unit for convenient access during installation.

This concentric vent design is very unique with its important safety benefits. The concentric vent means that it holds both intake and outtake pipes, so the vent is cool to the touch as the warm air is insulated inside. If a intake or outtake pipe develops a leak, the air stays in the concentric vent and does not enter the home. The dangers of a gas leak are immeasurable; from fire and combustion to carbon monoxide poisoning.

The Rinnai RUC98iN is quiet, compact, and gives you immediate hot water when you want it. Because the water is being heated on demand, there can be a slight drop in water pressure if multiple showers are running at the same time. Also, be sure give a tankless unit about 8-10 seconds to clear the cold water out of the pipes before jumping into the shower expecting hot water.

The Rinnai RUC98iN is certified through Energy Star with a rating of 0.96. This tankless water heater will not only work to save you money on your energy bill, but will also save space—it is about the size of a small suitcase at 10 x 18.5 x 26 inches.

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4. Rinnai RL94iN Indoor Natural Gas Tankless Water Heater

commercial-tankless-water-heaters-4This Rinnai unit is for indoor installation only. Its natural gas energy source and its
9.4 gallons per minute (GPM) water flow capacity puts it generally in the middle of the price range for our commercial tankless water heater list. The venting method on the RL94iN is concentric—which means the interior and exterior pipe-in-one system allows your hot exhaust to exit through an interior tube, while fresh air enters through the outer layer.

It’s probably important for you to know that the RL95iN gas range is from 9,900-199,000 BTU and has an Energy Factor (EF) of 0.83, so it is Energy-Star qualified. The RL95iN is also engineered with an enhanced scale detection protection, so it will help reduce the possibility of damage to the unit and parts. Even so, it wouldn’t hurt to install external filters or water softeners to help diminish mineral deposits, especially if you have hard water in your area.

Rinnai has created an integrated, trademarked Circ-Logic recirculation program, which essentially cycles an external pump at pre-set intervals and temperatures to reduce strain on the water heater and keep your water at comfortable temperature levels. The RL95iN also has a minimum activation level of 0.4 GPM—which means you shouldn’t have to run the tap too long to get a bit of hot water. For a residential setting, the RL94iN comes standard with a digital controller, and the temperature can be controlled from 85-140°F. For a commercial setting, you must purchase a separate commercial controller for temperatures of 98-185°F.

The Rinnai RL94iN, as with all Rinnai tankless water heaters, is designed to always provide maximum performance and operating efficiency using either a ¾” or ½” gas line, as long as sufficient gas flow is available. Be sure to consult the operation and installation manual for complete information on gas sizing.

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  • T-D2-OS-NG
  • Brand: Takagi
  • Dimensions: 8.5 x 13.8 x 20.3 inches
  • GPM: 10.0
  • Weight: 45 pounds
  • Warranty: Manufacturers

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  • C 1210 ESC
  • Brand: Bosch Thermotechnology
  • Dimensions: 17.9 x 11.2 x 30.5 inches
  • GPM: N/A
  • Weight: 90 pounds
  • Warranty: Manufacturers

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  • RL94eN
  • Brand: Rinnai
  • Dimensions: 9.3 x 14 x 23 inches
  • GPM: 9.4
  • Weight: 46 pounds
  • Warranty: Manufacturers

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  • NCC1991-DVLP
  • Brand: Noritz
  • Dimensions: 13.8 x 10.6 x 22.3 inches
  • GPM: N/A
  • Weight: 77 pounds
  • Warranty: Manufacturers

5. Takagi T-D2-OS-NG Outdoor Natural Gas Tankless Water Heater

commercial-tankless-water-heaters-5The Takagi T-D2-OS-NG is an outdoor unit with a natural gas fuel source hookup. It would work well for high-need residential areas, like possibly space heating or radiant or hydronic floor heating systems. It is capable of running up to four simultaneous showerheads in warmer climates, or two in cooler climates. For smaller commercial operations like beauty salons or spas, or even a small cafe or restaurant, this is a great unit as well.

Since this is an outdoor unit, the T-D2-OS-NG also comes standard with freeze protection and includes a remote control. It will also alert you if there are any other safety issues, such as overheating, surge protection, and troubleshooting diagnostic codes. Takagi offers a 15-year limited heat exchanger warranty, 5 years of warranty on limited parts, all for residential use. As far as commercial use and warranty: You get a 10-year limited warranty on the heat exchanger, and 5 years of warranty on limited parts.

The T-D2-OS-NG has an Energy Factor (EF) of 0.82 for natural gas heating. It is a low NOx emission heater, with max BTUs of 199,000 and pulling 120 volts to run. For your installation, you’ll want to make sure your water connections are ¾ inch pipes.

You can expect, at the very lowest temperature rise, you will get 10 GPM. That should be plenty for almost any residential need, including a home with 3-4 bathrooms or high-water use appliances like Jacuzzi tubs or multiple showerheads. At a 35°F temperature rise, the maximum flow rate is 8.0 GPM, and you can get abou 4.4 GPM at a 70°F rise.

If you are expecting to run this in a commercial application, Takagi offers their Easy-Link system to connect and control up to four units without a Multi-Unit Controller. Best of all, this unit is very reasonably priced while also being able to function in a commercial space. It is the second most economical price in our commercial list.

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6. Bosch C 1210 ESC NG Natural Gas Indoor Commercial Condensing Tankless Water Heater

commercial-tankless-water-heaters-6You are looking at the highest-end fully condensing gas tankless water heater from Bosch with their C 1210 ESC. This high-performance heater is best for commercial use, as it throws 225,000 BTUs and can reach temperatures of 180°F—so it would work well for commercial laundry applications, spas or salons, restaurants or other washing stations with high hot water needs. It offers an impressive 12.1 GPM flow rate at a 35°F temperature rise, and even at at 55 degree rise, it still gives a flow rate of 7.7 GPM.

By harnessing the exhaust gas heat and using it to preheat the incoming cold water, the condensing C 1210 ESC offers you increased thermal efficiency at 98% and reduced emissions—easily eclipsing the 2012 Low NOX emissions standards set by SCAQMD (California — South Coast Air Quality Management District).

While you will find the C 1210 ESC at the high end of the price range, the flow rate and the fact that it is the only ASME-certified condensing version on the market today give you clues to its price point. This heater features an electronic ignition system and can vent with 3-inch or 4-inch PVC, CPVC, ABS, or category III stainless steel either through the side wall or up through the roof, at a maximum distance of 63 feet. Available for those who want it, is a concentric venting option. Gas connections are ¾ inch lines.

Since this unit is designed for either indoor or outdoor installation, the C 1210 ESC comes with built-in freeze protection and an externally accessible water filter. However, it does not come with a pressure relief valve.

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7. Rinnai RL94eN Outdoor Natural Gas Tankless Water Heater

commercial-tankless-water-heaters-7This Rinnai unit is for external, outdoor installation only, so it would work best in a warm climate that is moderately protected from bad weather elements, and especially not in an area that ever freezes. Its natural gas energy source and its 9.8 gallons per minute (GPM) water flow capacity puts it in the reasonable mid-range for price.

You’ll naturally want to know that the RL95eN gas range is from 9,900-199,000 BTU and has an Energy Factor (EF) of 0.83, so it is Energy-Star qualified. It is a direct electronic ignition and the gas and water line connections are all ¾ inch pipe connections.

The RL95eN is also engineered with an enhanced scale detection protection, so it will help reduce the possibility of damage to the unit and parts. Even so, it wouldn’t hurt to install external filters or water softeners if you have hard water in your area.

Rinnai has created an integrated, trademarked Circ-Logic recirculation program, which essentially cycles an external pump at pre-set intervals and temperatures to reduce strain on the water heater and keep your water at comfortable temperature levels. For a residential setting, the RL95eN comes standard with a digital controller, and the temperature can be controlled from 85-140°F. For a commercial setting, you must purchase a separate commercial controller for temperatures of 98-185°F.

You can expect the Rinnai RL95eN to power five different hot water draws or appliance sources at the same time. The RL95eN also has a minimum activation level of 0.4 GPM—which means you shouldn’t have to run the tap too long to get a bit of hot water.

As far as the warranty goes, Rinnai gives a 12-year warranty on its heat exchanger, offers 5 years on parts, and a 1-year labor warranty for residential installations.

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8. Noritz NCC1991-DVLP Commercial Condensing Propane Tankless Water Heater

commercial-tankless-water-heaters-8Noritz has pulled out all of the stops with the NCC1991. As you can guess from the name, this is a fully condensing unit, with a max capacity of 199,900 BTU. You will find this heater as the very highest price-wise on our list for good commercial tankless water heaters, but you must know that with that price point comes increased capacity, efficiency and of course premium features.

Noritz has designed the NCC1991 with a dual heat exchanger—both stainless steel and copper. The stainless steel component captures the heat from exhaust gases and uses that residual heat to preheat the water before it flows through the main copper heating element. The copper element is 25% thicker than most other copper heat exchangers. It also reduces your carbon dioxide output, making this a low-NOx water heater and giving you an impressive 94% efficiency with the propane fuel source.

That dual heat exchanger also allows for a significant lowering of the exhaust temperature, which allows you to use more cost-effective PVC pipe for venting. This condensing heater allows you to use 3-inch or 4-inch PVC for venting, saving you money versus other units that require stainless steel.

This direct-vent unit is designed to be used indoors, and can be wall mounted with its compact design. The NCC1991 has a direct electronic ignition, needs 120 volts to power it, and includes a remote thermostat to control the temperature output from 100-185°F. The power cord and remote controller cord are both included, and this unit is designed to easily connect to a second unit with the Quick Connect setup, or with up to 24 units with a System Controller.

As far as flow rate, as typical, it all depends on your temperature rise demands. If you’re in a warmer climate and only need a 30°F rise, you can get up to 11.1 GPM from the Noritz NCC1991, one of the highest GPM rating of all our reviewed tankless water heaters. Even at an incredible 140°F rise, you’ll still receive 2.7 GPM, an impressive feat for even a lower priced unit.

As you’ve probably guessed from the commercial nature of this unit, yes it is true, the connections for water and gas lines are all ¾ inch connections. The condensate drain is ½ inch threaded. As an added bonus, Noritz includes a five-year limited warranty on the heat exchanger for commercial use, and a limited 5 year warranty on parts.

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Summary

When you’re looking for a good commercial tankless water heater, you have likely brought a specific list of features that you want. If you’ve taken the time to read through our review, we truly hope you’ve found just the right fit for your home or business. In this era of information accessibility, it can be somewhat overwhelming to research all of the commercial tankless water heater reviews, so we’ve done all the hard work for you. By diving deep into manufacturer specs and customer reviews, the best seem to float to the top and offer you a great on-demand hot water experience.