With winter coming up, a commercial tankless water heater is a must-have. Whether you’re looking for a hot steamy bath or you just want hot water in your taps, water-heaters are a necessity.
Commercial tankless water heaters feature a unique mechanism that heats water as it flows through the pipes. All you need to do is set a custom temperature, and you’re good to go. Just turn on the tap, and you get hot water instantly.
Commercial tankless water heaters also have an auto shut-off feature that turns off the heater as soon as it detects that water isn’t used anymore. Considering the wide variety of water heaters available, it might become challenging to pick one. To ease your search and help you find the best commercial tankless water heater, we’ve made a list of the 10 best products. Here are the top 3 picks for you, followed by a detailed review of 10 best commercial tankless water heater.
- Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater – Best overall , compact yet powerful with over 96% efficiency
- Rinnai RL Series HE+ Tankless Hot Water Heater RL75eN – Featuring freeze protection and remote control
- Stiebel Eltron Tempra Plus 24 kW Tankless Water Heater – Best value for money , with over 99% efficiency
Contents
- Best Commercial Tankless Water Heaters
- Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater
- Rinnai RL Series HE+ Tankless Hot Water Heater RL75eN
- Stiebel Eltron 224199 240V Whole House Tankless Electric Water Heater
- Rinnai RL Series HE+ Tankless Hot Water Heater RL75iN
- Rheem RTG-64XLN Outdoor Tankless Natural Gas Water heater
- Takagi T-K4-IN-NG Indoor Tankless Water Heater
- Noritz NC380-SV-ASME NG ASME Tankless Natural Gas Water Heater
- Rheem RTE 13 Electric Tankless Water Heater
- EcoSmart ECO 27 Electric Tankless Water Heater
- Rheem RTEX-18 18kW 240V Electric Tankless Water Heater
- Advantages of a Commercial Electric Tankless Water Heater
- Features to Consider when Choosing a Commercial Electric Tankless Water Heater
Best Commercial Tankless Water Heaters
Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater
Rinnai is one of the most commonly known brands when it comes to water heaters. Rinnai RUR98iN tankless water heater features a 9.8 gallons per minute flow rate, which is ideal for commercial usage. It requires natural gas for its operation.
It features a dual heat exchanger, and the temperatures can rise as high as 185 degrees F. With a dedicated recirculation operation in the heater itself, you no longer have to worry about running out of hot water.
It features a compact design with dimensions being 12.5 x 10 x 26 inches. It can be installed indoors with ease. Even though it is compact in size, it still features high output and provides an endless supply of hot water. No matter the conditions, it only takes about 15-20 seconds to heat up the water, and once it heats up, you get warm water for as long as you need. It also features wifi control for remote operation.
User critics
It is an ideal indoor gas-powered tankless water heater. No matter how many of you use hot water, you will never run out of hot water again!
Pros
- Compact size and easy installation
- A flow rate of 9.8 gallons per minute
- Built-in recirculation system
- Dual heat exchangers
- 12-year warranty on heat exchanger, and a 5-year warranty on heating elements
Cons
- Produces minimal humming sound
Final Verdict
Rinnai RUR98iN Ultra Series is an overall best heater. The only downside to it is the humming sound that it makes. However, if you’re getting an endless supply of water, a minimal humming sound is no bother.
Rinnai RL Series HE+ Tankless Hot Water Heater RL75eN
Rinnai RL Series HE+ RL75eN is an outdoor gas-powered water heater. It features a 7.5 gallons per minute flow rate, which makes it ideal for residential usage. It requires propane for its operation and has to be used outdoors only.
It features a Circlogic technology that recirculates hot water and avoids using excess water. Its temperature can rise as high as 160 degrees F.
Unlike the traditional outdoor water heaters, it is compact in size, with dimensions being 14.02 x 10 x 22.99 inches. It can be installed outdoors on a wall mount and doesn’t take any excess space. It can be used for up to 5 baths while providing a constant supply of hot water. However, in the case of multiple baths, it takes quite some time to heat up.
Rinnai RL75eN features freeze protection –thus keeping your heater equipment safe from outside interferences of the temperature. Like other Rinnai products, it also features wifi control to enable remote operation.
User critics
This product is easy to install and provides you with a constant supply of hot water, with a condition. The flow rate of water must be near the minimum, or else you will get cold water.
Pros
- Compact size and easy installation
- A flow rate of 7.5 gallons per minute
- Built-in recirculation system
- Works excellent for up to 5 baths
- 10-year warranty on heat exchanger, and a 5-year warranty on heating elements
Cons
- Requires flow rate to be near the minimum or more
- Takes quite some time to heat up the water in case of multiple baths
Final Verdict
Rinnai RL Series HE+ RL75eN is an ideal outdoor water heater. It only requires a water flow rate to be, at a minimum, to offer endless supplies of hot water.
Stiebel Eltron 224199 240V Whole House Tankless Electric Water Heater
Siebel Eltron 224199 is a whole house tankless water heater that offers constant hot water all-around your house. It features an advanced flow control that provides you with a continuous flow of hot water. It also maintains a flow rate as per its requirements. It features a 5 gallons per minute flow rate.
For ideal results, it works best when the water supplied to it is under 45 degrees F. It features a space-friendly design, with the dimensions being 21.7 x 20.1 x 9.6 inches. It can be used commercially and as well as in residential properties. Due to the high quality of equipment installed in it, it can withstand any kind of usage.
It runs on a supply of 220V, and its operation is quiet, so you won’t notice any sounds in its operational state. Stiebel Eltron 224199 offers up to 99% efficiency and lowers your total electric bill even when run for 24hrs.
User critics
Stiebel Eltron 224199 has to be one of the most durable products. It is one of the best commercial tankless water heaters, but it requires installation by a professional and a stable supply of 220V.
Pros
- Features an advance flow control
- A flow rate of 5 gallons per minute
- Durable
- Quiet operation
Cons
- Requires installation by a professional
- Requires a stable supply of 220V
Final Verdict
You cannot go wrong with Stiebel Eltron 224199 and its ability to maintain constant hot waters running in your pipes for as long as you want!
Rinnai RL Series HE+ Tankless Hot Water Heater RL75iN
Rinnai RL75iN is an indoor tankless water heater. It features a 7.5 gallons per minute flow rate, which makes it ideal for your day to day usage. Whether you’re washing dishes with it or you’re child is having a long bath, you will never run out of hot water with this product. Its temperature can rise as high as 160 degrees F.
It requires natural gas for its operation. It also features a Circ-Logic technology that recirculates hot water in your pipes to increase efficiency. Its compact design with dimensions being 14 x 9.3 x 23 inches makes it easy to install in any part of your bathroom.
It also features a digital display that allows you to efficiently operate it and set your desired temperature. It can efficiently run two to three fixtures at a time.
User Critics
Rinnai RL75iN successfully lowers your monthly gas costs and provides you with heated water for as long as you want it to. It also produces minimal noise in running conditions.
Pros
- Compact in size, allows easy installation
- A flow rate of 7.5 gallons per minute
- Built-in recirculation system
- 12-year warranty on heat exchanger, and a 5-year warranty on heating elements
Cons
- Noisy operation
- Requires a professional to install the venting kits
Final Verdict
Rinnai RL75iN efficiently provides you with a hot water supply in up to 3 fixtures. However, it might produce minimal noise when operating like any other piece of electronics.
Rheem RTG-64XLN Outdoor Tankless Natural Gas Water heater
Rheem RTG-64XLN is an outdoor tankless water heater. It operates on natural gas and provides you with an environment-friendly operation due to the low NOx. It features a 6.4 gallons per minute flow rate, which makes it ideal for commercial as well as residential properties.
It serves you with an energy-efficient operation with up to 82% thermal efficiency. It is compact in size, with dimensions being 14 x 10 x 26 inches, which makes it easy to install it in small areas. Keep in mind that it is an outdoor water heater.
It also comes buil-in with an overheat firm wrap that protects the heat exchanger from damage due to continuous usage of the water heater.
User Critics
With almost no wastage of water, this commercial tankless water heater provides you with an instant supply of hot water. It keeps the water warm at your desired temperature.
Pros
- Can be used for multiple fixtures
- A flow rate of 6.4 gallons per minute
- Energy-efficient
- Features a protective wrap for the heat exchanger
Cons
- Need to be installed with care
Final Verdict
Rheem RTG-64XLN is an ideal outdoor water heater. It works flawlessly for commercial properties because of its multiple fixture support.
Takagi T-K4-IN-NG Indoor Tankless Water Heater
Takagi T-K4-IN-NG is a dream come true for most of the people out there. It operates on natural gas. Takagi features an 8.0 gallons per minute flow rate, which makes it ideal for long-term usages. Its temperatures can rise as high as 167 degrees F.
It provides you with an eco-friendly alternative to the traditional water heaters because of the low NOx emissions. It features a compact design with dimensions being 8.5 x 13.8 x 20.5 inches.
This compact and space-saving design makes it easy to install in either format, whether horizontally or vertically. However, it does require venting kits, but it does what it says, provides you with an endless supply of hot water in up to 3 fixtures.
It also features freeze protection to keep the heater equipment safe from outside interferences of the temperature. Unlike any other tankless water heater, it features a whopping 15-year heat exchanger warranty and up to 5-year parts warranty.
User Critics
Takagi T-K4-IN-NG is hands down the best when it comes to providing an endless supply of heated water for up to 3 fixtures.
Pros
- Compact design allows for easy installation
- A flow rate of 8.0 gallons per minute
- Eco-friendly low NOx design
- 15-year warranty on heat exchanger, and a 5-year warranty on heating elements
Cons
- Takes 20 seconds to heat up water
Final Verdict
Takagi T-K4-IN-NG will not let you down in any way. It features an advanced eco-friendly design that saves the environment from any harmful emissions while providing you with a constant supply of hot water.
Noritz NC380-SV-ASME NG ASME Tankless Natural Gas Water Heater
Noritz NC380-SV-ASME operates on natural gas. It features a whopping 13.2 gallons per minute flow rate. Its temperatures can rise as high as 180 degrees F.
Its dimensions being 29.7″ x 19.1″ x 11.8″ inches, makes it easy to install on both indoors and outdoors surfaces. It requires a separate ventilating kit, but once it is configured and installed, it provides you with warm water for as long as you need it.
It serves you with an energy-efficient operation with up to 80% thermal efficiency. It works both for commercial and residential properties, but it is designed with commercial usage kept in mind.
User Critics
Since it is a commercial-grade water heater, it needs to be installed by a trained professional.
Pros
- Commercial-grade water heater
- Temperature can be set at a whopping 180 degrees F
- Energy-efficient
Cons
- Requires installation by a professional
Final Verdict
Noritz NC380 is an ideal water heater built for commercial properties with more significant usage compared to homes. It efficiently provides an output of 13.2 gallons per minute.
Rheem RTE 13 Electric Tankless Water Heater
Rheem RTE 13 is an indoor tankless water heater. It is fully electric and only requires a stable supply of 240V. It features a 4 gallons per minute flow rate, which makes it ideal for apartment usage.
It features a space saving design with the dimensions being 7.25 x 7.25 x 7.25 inches only. Its compact design allows it to install it in small households. It efficiently provides a constant supply of hot water for up to 2 fixtures.
It is simple yet effective, featuring a standard analogue dial which makes it easier for you to set your desired temperatures. Its temperature can rise as high as 140 degrees F.
User critics
Rheem RTE 13 might be compact in size, but when it comes to functionality, it doesn’t disappoint you in any way.
Pros
- Compact design allows for easy and quick installation
- A flow rate of 4.0 gallons per minute
- Fully electric operation
- Copper-based heat exchanger
- Features an LED to indicate when in operating conditions
- 10-year warranty on heat exchanger, and a 1-year warranty on heating elements
Cons
- Requires a stable supply of 240V
Final Verdict
Rheem RTE 13 might not look like much when it comes to the size, but it is a feature-rich all-electric commercial tankless water heater which will not let you down in any way.
EcoSmart ECO 27 Electric Tankless Water Heater
EcoSmart ECO 27 electric tankless water heater is one of the most favourited water heaters of all times. It features a 6.5 gallons per minute flow rate, which makes it ideal for all kinds of usages.
It is designed with space-saving kept in mind, with the dimensions being 17 x 17 x 3.625 inches it can easily be installed on all surfaces. Its temperature can rise as high as 140 degrees F. It can be used for up to 4 baths while providing a constant supply of hot water.
It features a unique combo of a digital screen and analogue dial to control the temperature and set it according to your desired conditions. It comes built-in with 3 heat exchangers to ensure a quick and constant supply of hot water for all your needs. These 3 heat exchangers are energy efficient and only run when required.
User critics
EcoSmart Eco 27 works wonders. The only downside to it is that it requires periodic maintenance like any other product.
Pros
- A flow rate of 6.5 gallons per minute
- Space-saving design
- Ideal for multiple fixtures
- 3 heat exchanges that run as per requirements
- Lifetime warranty
Cons
- Requires periodic maintenance
Final Verdict
EcoSmart Eco 27, as it says in the name itself. It is energy efficient and cuts down on up to 50% of your total electricity costs.
Rheem RTEX-18 18kW 240V Electric Tankless Water Heater
Rheem RTEX-18 is an indoor electric tankless water heater. It features a 4.4 gallons per minute flow rate, which works for most of the large-medium households. Its temperature can rise as high as 160 degrees F.
It features a unique and stylish design that looks good on all kind of walls, whether you install it in your kitchen or your bath. Its dimensions being 18.25 x 3.5 x 14.5 inches makes it easy to install.
It can be used for up to 2-3 fixtures with a constant supply of hot water. It offers two heat exchangers that are manufactured from copper. It comes with a built-in digital screen for temperature and also features an analogue dial for easy control of the temperature.
User Critics
Rheem RTEX-18 has been making its name since the very first tankless water heater. You won’t see any temperature fluctuations anymore with this product. However, it requires proper installation according to the instructions provided.
Pros
- Unique and sleek design
- A flow rate of 4.0 gallons per minute
- Ideal for multiple fixtures
- Two heat exchangers
Cons
- Requires proper installation by a professional
Final Verdict
Rheem RTEX-18 provides you with a constant supply of hot water with a sleek and unique design. It works great for up to 3 fixtures.
Advantages of a Commercial Electric Tankless Water Heater
Commercial electric tankless water heaters are also referred to as instantaneous water heaters. These provide hot water as you need it. Whereas traditional water heaters feature 30 gallons or 50 gallons, depending on the brand and the requirement, which works by storing and heating water in the tank. This can lead to an increase in your gas costs because these heaters run 24hrs.
Commercial electric tankless water heaters work by heating water as it flows through the pipes when you turn on the tap. While it may take about 10-20 seconds depending on the model, once it starts providing you heated water, it works for as long as you need it until you entirely run out of water. These are energy-efficient and lower your total gas costs by 25-50%.
Features to Consider when Choosing a Commercial Electric Tankless Water Heater
There are a few factors or features that you need to consider before buying a commercial tankless water heater.
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Water Flow Rate
The water flow rate of a tankless water heater is the first and foremost factor that comes to play when buying one. To ensure you get the most out of your water heater, you should consider the number of fixtures that you require hot water in and pick a model with the desired water flow rate.
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Temperature Range
The second thing that you need to consider is the temperature range If you require hot water in your shower, sink, kitchen, you need a heater with at least 130 degrees F max temperature.
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Efficiency
Tankless water heaters are supposed to be running 24hrs. It needs to be energy efficient to lower your total electricity and gas costs.
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Warranty
Every piece of electronics requires a warranty. A tankless water heater can be a bit costly when it comes to maintenance. Therefore you need an extended warranty from the manufacturer.
