Tankless water heaters are at an all-time high in popularity, thanks to their high energy efficiency and the sheer convenience they offer. If you’re already in the market, it’s quite probable you already know why they are such a great purchase. But for the uninitiated, with a tankless water heater, you can reduce your energy bills by up to 30% if you use around 30-40 gallons of water every day. Instead of keeping water hot in a tank like traditional heaters, this type of water heater gives you hot water on demand, all the time.
Given their appeal, there are too many in the market, and it’s hard to zero in on one. Understanding this dilemma of yours, we decided to do the heavy lifting for you and do a comprehensive research of the various options in the market.
Here, we look at how these units work, their different types, their benefits, and of course, we have listed our recommendations for the best Tankless Water Heaters in the market.
Tankless Water Heater Reviews 2018
Our #1 Recommendation – EcoSmart ECO 27 Electric
Designed with energy efficiency in mind, this water heater is one of the most affordable ones in the market. It is a small capacity model that is great for the home or office. With the help of a patented self-modulating technology, it draws the right amount of energy when it needs it. EcoSmart ECO 27 offers you high value for money when you want to save on water heating costs. A great buy to meet the needs of a small household.
Our #2 Recommendation – Eccotemp Systems FVI-12 Natural Gas 3.5GPM
Simply stated, the Eccotemp Systems FVI-12 is a high-powered natural gas heater for indoor home use that provides powerful heating, to meet the demands of a small household with multiple devices. It is a lightweight and compact water heater that is not going to take up more space than it needs to in your home.
Our #3 Recommendation – Camplux 5L 1.32LGPM Outdoor Propane Water Heater
This model is rated as one of the most effective thanks to the low water pressure startup. If you are a fan of the outdoors and love the RV life, this water heater is all you need to fulfill your water needs on the go. It’s easy to set up in the outdoors and comes with a shower handle to maximize convenience. It is a small capacity tankless water heater that will showcase its efficiency in small applications.
|Model||GPM||Type||Dimensions in Inches||Weight||Rating|
|EcoSmart Eco 27||3GPM / 6GPM cold and warm climate||Electric 27kw 240V||17H x 17W x 3.625 D||13.75 pounds||4.8/5|
|Rheem RTE 13||4GPM||Electric 13kw 240V||7.2H x 7.2W x 7.2D||7.35 pounds||4.8/5|
|Stiebel EltronTempra Plus||Varies with the water flow and ambient temperature||Electric 19kw 240V||16 5/8W x 14.5H x 4 5/8D||15.4 pounds||4.7/5|
|Sio Green SIO 18 Whole House Infrared||2.5 GPM / 4.5 GPM cold and warm climate||Electric Infrared 240V 18kw||20H x 14W x 6D||27 pounds||4.7/5|
|Eccotemp Systems FVI-12||3.5GPM||Natural Gas |
120V electric power
|25H x 15.5W x 6D||33 pounds||4.9/5|
|TAKAGI T-KJr2-IN-NG||6.6GPM||Natural Gas up to 140,000BTU |
110v electric power
|20.3H x 13.8W x 6.7D||38 pounds||4.9/5|
|RheemRTGH-95DVLN Indoor||9.5GPM||Natural Gas |
11,000- 199,000 BTU
|27.5H x 18.5W x 9.8D||79 pounds||4.7/5|
|Rinnai RUC98iN Ultra Series||9.8GPM||Natural Gas up to 199,000BTU |
120V electric power
|26H x 18.5W x 10D||82 pounds||4.8/5|
|Camplux 1.32GPM||1.32GPM||Propane Gas |
2 D-size batteries
|14.6H x 11.4W x 5.5D||10.1 pounds||4.6/5|
|Rheem RTG-64XLP 6.4GPM Low NOx Version||6.4GPM||Propane gas||26H x 14W x 10D||54 pounds||4.6/5|
|Takagi T-T-KJr2-OS-LP||6.6GPM||Propane gas |
|20.3H x 13.8W x 6.7D||38 pounds||4.6/5|
Best Electric Tankless Water Heaters
Best for Home: EcoSmart Eco 27
EcoSmart is a highly cost-effective model. Compared to others, you will get the most value from this unit; even more so if you need it for a small household.
EcoSmart comes in a thoughtful design. It is compact-sized, requiring little space during installation. With the help of a self-modulating technology, it ensures only the necessary amount of energy will be drawn to heat the water, which makes the EcoSmart Eco 27 very efficient in using energy.
It is an ideal pick whether you live in a Northern or Southern climate. If water temperatures reach below 400F, you can get up to 3 gallons of water per minute. If you require one for a home that has two showers, this is the perfect choice for you.
And if you live in areas where water temperatures do not need a high-temperature rise, it can deliver up to 6 gallons of hot water per minute.
So it is ideal for households in colder climates with 1 or two fixtures, or for larger setups in moderate climates. You have every reason to pick this unit as it is efficient in all temperature spectrums.
The user-friendly model also allows you to adjust the water temperature in increments of 1-degree from 800-1400F. This feature is so intuitive since you get just the right level of heat for different purposes. Whether it is for the shower, your bath, the dishwasher, etc.
The electric tankless water heater excels in cold temperatures as it does in warm temperatures. It favors you if you live in the Northern climate since most water heaters will barely raise the water temperature enough if the ambient temperatures keep on fluctuating to the lows.
You will love it more because of its durability thanks to the use of premium stainless and copper components.
You get a lifetime warranty on this unit which makes it an extremely lucrative purchase. The warranty is transferrable, and for its price, EcoSmart Eco 27 is quite a reasonable buy.
- Provides a digital system for temperature control
- Compact size for limited space
- Performs well in extreme temperatures
- Offers water heating savings by up to 50%
- Cannot service large homes
2nd Best Pick for Home: Rheem RTE 13
Rheem is a famous brand when it comes to the production of electric and gas tankless water heaters. The Rheem 13 has emerged as a reliable tankless water heater for single-shower households, or medium-sized ones with a couple of limited-flow showers. It is suitable for indoor use, and it has an energy star for energy efficiency.
With the use of brass and copper heat exchanger, this heater can give up to 4 GPM. It is an efficient model if you are looking for an average-sized unit to fulfill the needs of a medium-sized household. We especially like that it can distribute the heat evenly ensuring that you get uniformly heated water at all times.
This unit requires only 0.4GPM to activate the water heating process. It needs 240V 13kw to give a constant amount of output at the temperature you set. Also, it has a temperature regulating mechanism using a dial and an LED status which lets you know whether it is activated or not.
Rheem RTE 13 is pretty easy to install. It comes as a single unit where you only need to input the waterlines and secure it on a secure wall. It is also compact which leaves you with a lot of options for places where you can install this unit.
This water heater can perform well at optimum levels. This is where you get a temperature rise of 50degrees Fahrenheit if the input water temperatures are at 55 degrees Fahrenheit to give you 1050F. In these conditions, you will obtain 1.75 GPM making it suitable for homes and other places where the need for hot water is not too high.
- Uses durable copper/brass heat exchanger
- Comes with a 10-year warranty
- Fits comfortably in small spaces
- Very cost-effective
- Easy to install
- Does not come with all the necessary accessories
Best for Cold Climates: Stiebel Eltron Tempra Plus
Electric water heaters struggle when used in colder climates. But the Stiebel Eltron Tempra Plus is designed to give you liberal amounts of hot water when the mercury plummets. With the host of features on offer, it is hard to argue why the Stiebel Eltron Tempra Plus is not one of the most advanced and well-rounded options on the market.
This unit boasts of a sturdy build quality which gives you long-term reliability. Another striking feature is the tankless heater’s noiseless functioning. The high-quality electronic parts and cover are why, unlike most other heaters in the market, this one works in absolute silence. To take things up a notch, it utilizes self-modulating technology that allows it to draw a constant amount of energy irrespective of the amount of water it heats. Best of all, it automatically adjusts the water flow to suit high demands. So you can expect an abundant supply of hot water, heated very efficiently despite the high demand.
The output water will always be at the ideal temperature even in frigid weather.
This unit bears a sleek design to allow installment in packed homes. You will love that it has digital temperature control and that you can save yourself some energy bills. What’s more, like in other electric heaters, it does not need any venting. It will only require annual maintenance to keep it in ideal working condition year after year.
Most users agree that this is one of the most efficient designs for multiple outlet devices since you can run two showers and the dishwasher without affecting the temperature of the water. It does not have a maximum flow rate because of the internal self-adjustment mechanism, making it even more applicable for busy homes.
- Auto-modulation saves on energy
- Flow control for constant temperature even on high demand
- Does not require venting
- Ideal for homes with high hot water demand
- Durable unit with a 7-year warranty
- It is costlier than other electric tankless water heaters.
- Comes with a pre-requisite of only being installed by an expert
Best Low-Maintenance Tankless Water Heater
Sio Green SIO 18 Whole House Infrared
If you are not game for flushing out limescale every 6-12 months (to be fair, who is?), you have yourself a winner with the Sio Green SIO 18 Infrared Electric Water Heater. Unlike most conventional electric heaters, it uses Quartz heating elements to heat the water as it runs through the chambers. It does not have any heating coils so you won’t need to maintain any parts.
This model is one of its kind in the market. Unlike units that require water to come into contact with metal, water runs through heated water chambers using infrared energy. It is perhaps the best eco-friendly option, and also the healthiest, as there are no chances of mineral deposits gathering over time.
SIO 18 extends its durability by eliminating corrosion over time. It also offers the lowest power drain which indicates it will save you more energy costs.
This unit, like a few other top-notch offerings, uses self-modulating technology to reduce energy draws further. It will cool down as soon as the water is shut off. For cold climates, we find that it will only be sufficient for small homes since it can deliver 2.5GPM making it suitable for individual use, or smaller households with a single shower and another limited flow fixture.
It can deliver relatively higher flow in warm climates. We also recommend this for use in RVs since it has a small power drain as well as a reasonable flow rate for your needs on the go.
- Coil-less technology eliminates corrosion and limescale deposits
- High-standard self-modulating technology
- Uses Quartz heating elements which are recyclable
- Environment-friendly: no venting required
- Useful for small-demand applications only
Best Natural Gas Tankless Water Heaters
Best for Medium Demand: Eccotemp Systems FVI-12 Natural
If you are searching for a powerful unit to run two devices without compromising the water temperature, you will love the EccoTemp Systems FVI-12 Natural Gas model. It can deliver hot water at a rate of 3.5GPM at optimum conditions.
This model is a high-powered unit; great for instant hot water showers, baths, and kitchen use. It is pressure-triggered as it needs a water pressure of 40 psi to sustain a continuous flow of water. You will like that it has separate controls for the water temperature and the gas pressure. The user-friendly design offers you a digital display allowing you to read and adjust water temperature.
This model comes with all the necessary accessories to help install it with no fuss. You will receive a stainless steel vent kit, the showerhead, gas regulator, and the hose, adapters, and quick connect for the output water.
This unit can provide a temperature rise of up to 450F to a flow rate of 4.0GPM of water in ideal conditions. If you need to supply multiple devices, it reduces the output flow to provide you with water at the temperature you set it.
This unit only requires a standard power unit of 120V. The natural gas heater’s compact size saves you unnecessary hassles in the installation process.
Because of the limited flow rate per minute, it is best to satisfy the daily needs of small homes. It is also ideal for cottages and vacation cabins.
- Individual controls for the water temperature and gas pressure
- Quick to install since it comes with all the accessories
- Adjusts water flow to maintain constant water temperature
- Low-priced for a natural gas water heater
- Needs flushing after four months which is quite a short time by industry standards
Best Compact Design Natural Gas Tankless Water Heater
TAKAGI T-KJr2-IN-NG Indoor Unit
One reason for opting for gas-powered water heaters is their capacity to meet more hot water demands. The Takagi T-KJr-IN-NG is a unique model that operates on natural gas with a gas input of up to 140,000 BTU. Its ability to serve the demands of a medium-sized household, even in significantly colder climates, has earned it rave reviews from many corners.
This gas-fed tankless model can provide water supply comparable to that of a 40-gallon tank water heater. It can fulfill the demands of a busy home since you can supply hot water to several appliances.
The fact that it comes with thermistors and air-fuel ratio sensors ensures that this unit works efficiently at all times. The air-fuel ratio sensors keep track of minimizing pollutants to the environment. Temperature safety controls minimize the risk of overheating since it will auto-shutoff when the temperature gets too high.
This unit is excellent for a wide variety of uses. This includes radiant heating and hydronic baseboard applications.
The heater delivers an impressive flow rate of 6.6GPM. It is handy since it will run multiple showers at the same time at an ideal temperature. Also, it provides a remarkable temperature rise which provides excellent heating, whether it is winter or summer.
- Reliable in high flow water rate needs
- 5GPM activation rate
- Ample safety measures (surge breakdown, digital meter protection, and freeze protection)
- Has an Air-Fuel Ratio Sensor
- Comes with a temperature control feature
- High-quality design improves durability
- It requires professional installation which can be expensive
Best for Large Home
Rheem RTGH-95DVLN 9.5GPM Indoor
The Rheem RTGH-95DVLN is not by any means an entry-level tankless water heater. It is a powerful prolific unit, providing up to 9.5GPM of flow rate in optimum conditions. It can deliver hot water in the busiest of homes. If your family regularly uses over four showers, all of them can run at the same time, so you get to enjoy the luxury of hot water, no matter the situation. While the price may be prohibitively high, if you’re in the market for a tankless heater that can meet all your demands without a fuss, this is one for you.
Rheem is best known for their practical designs. This model is an excellent example of what they can achieve. Surprisingly compact for its power, it is built for indoor use, and vents to the outside for efficient airflow. It comes with stainless steel, and a copper heat exchanger to improve the life of the unit as well as provide high thermal efficiency.
With the intelligent electronic controls, this unit maintains its effectiveness in meeting the demands of large residences. The hot start programming is an effective means of reducing water temperature fluctuations so that no water outlet will receive cool water while another gets super-hot water.
For safety purposes, there is a Guardian overheat film which protects it from overheating. It also includes a remote control for temperature adjustments. With the self-diagnostic mechanism, it allows for troubleshooting so that you can be in the know of any lurking problems and remedy many of them yourself.
When a unit offers a flow rate of 9.5GPM, it is obvious that it can satisfy multiple points of application. It is straightforward to operate thanks to the intuitive digital display. This does not mean it will be simple to install so you will need to procure the services of a professional plumber.
Nevertheless, it provides 94-percent energy efficiency thanks to its stainless steel heat exchanger. Even better, it is technically a condensing unit, implying it absorbs the heat from the exhaust gasses vented out, enhancing energy efficiency and savings for you.
If you have huge water supply demands, you have every reason to go for the Rheem RTGH-95DVLN.
- High water flow rates of up to 9.5GPM
- Low NOx version is safe to install in homes
- Stainless steel heat exchanger provides up to 94% energy efficiency
- Perfect for cold weather due tothe freeze protection mechanism
- Minimal flow rate required for constant hot water
- Expensive to buy and install
Best for Commercial Use
Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
The Rinnai RUC98iN Ultra Series brings lots of innovative features to the table. It is sure to save you time and money as you fulfill the hot water demands of a commercial setting.
This water heater bears a flow rate of 9.8GPM. It is a great choice for both home and commercial use. It is compact in that it will not require a large installation room, but it is not lightweight by any means. It comes with a control panel that gives you access to the power button, controls for the water temperature and gas pressure, and a digital display.
You will be able to lock the temperature using a button to prevent unauthorized access. This implies the water will remain at the ideal preferred temperature when used in a commercial setting like a hospital.
Rinnai RUC98iN has an energy factor of 0.95. It showcases high energy efficiency that is much higher than other natural gas units in its class. This unit can run several applications thanks to its gas burn rate from 15,200 to 199,000BTU.
With this water heater, you will only need 0.4GPM to get it running and giving hot water continuously.
- Two venting options
- Ultra low NOx emission suitable for indoor use
- 8GPM is ideal for commercial settings
- Simple to operate the control panel
- Comes with a long warranty of up to 12 years
- Energy saving factor of 0.98
- High price tag, but it can be installed through a DIY application which will need a professional inspection
Best Propane Tankless Water Heaters
Best Tankless Water Heater for RV: Camplux 1.32GPM Propane Water Heater
Designed for the outdoors, Camplux is the perfect companion for adventures. It delivers water at 1.32GPM so you can enjoy a convenient hot shower away from home.
Camplux is an efficient compact water heater that is easy to set up in the outdoors. You get the convenience of continuous water flow especially if you are camping or taking a road trip. You will be able to hook up the gas and water supply effortlessly thanks to the available connections. It comes with a showerhead, so you’re ensured a great time outdoors despite the location.
Instead of connecting to an electric socket, this model uses a pair of D Cell batteries to power the onboard thermostat. This way, you can control the temperature settings alongside the water flow.
The stainless steel burner increases its longevity since it isn’t prone to corrosion.
The compact design of the Camplux makes it the ideal unit to use in the RV, for example. This is because, with the little space available for all your things, the last thing you want is a tank-style water heater that will take all the spare space that you have.
It is best suited for individual applications so you can only run one shower at a time or the washer alone. It has a decent water temperature rise of up to 114.80F which will depend on the temperature of the incoming water.
We are confident you will love the Camplux unit if you are an avid camper.
- Provides control settings for the temperature and water flow
- Portable design is ideal for living the RV life
- Uses a high-quality stainless steel burner
- Comes with connections for water and gas power
- Provides enough temperature rise for most individual applications
- Not ideal for home use
Best for Outdoor Installation
Rheem RTG-64XLP 6.4GPM Low NOx
Although the Rheem RTG-64XLP is a low NOx version, it will require installing outside. This is a model designed for residential use. It can run up to three appliances without temperature interference.
This is a solid model that exhibits efficiency since it delivers up to 6.4GPM with a 350F temperature rise. It is recommended for warm climates as it is more prone to temperature fluctuations due to ambient temperatures. However, we like that even then, you can expect a water flow of 5GPM as it strives to provide water at the set temperature.
This water heater can reach high temperatures up to 1800F. It is easily programmable so that each time you use it the heat output will always be as expected. The heater requires a minimum amount of 0.26GPM only to begin continuous water flow.
The Rheem RTG-64XLPis a highly functional tankless heater. From the burners to the ease of installation, you will not experience difficulties when using it. It is designed to burn less gas and produce fewer fumes making it an appropriate unit if you have little installation space outside your house.
You don’t have to resort to no hot water when you can have a continuous supply with the Rheem RTG-64XLP.
- Comes with a thermostat wire and remote control
- It is a low NOx version for reduced production of harmful fumes
- It can deliver up to 6.4GPM at optimum conditions
- It is an energy efficient device
- It should not be installed indoors because of the fumes
Best on a Budget
Takagi T-T-KJr2-OS-LP Outdoor Tankless Water Heater
Tankless water heaters usually come at a hefty price. And when you want to install a new system on a budget, the options can be limited. Takagi T-T-KJr2-OS-LP is an anomaly in the sense that it offers all the expected pleasures at a reasonable price. It gives you the opportunity to have hot water on demand without overly high expenses involved.
This is a capable water heater that should ideally be installed outdoors. We feel this is an improved model that concentrates on power and energy efficiency. In fact, this model has an energy factor of 0.82 and is approved by the US Department of Energy. It has a maximum gas intake of 140,000 BTU while providing an 82% energy efficiency.
It is a fully-modulating water heater that draws just enough fuel to maintain the required hot water flow. It also adjusts the water flow to ensure there are no fluctuations in the output heat.
This model cycles water at 6.6GPM max. It will run two baths or three showers if you do not need a high-temperature rise. This rate is most applicable for warmer climates where the outdoor weather doesn’t influence the temperature of water into the extreme.
The freeze protection feature is a thoughtful addition since you can depend on it when the weather goes left. It also has an overheating and surge protection feature.
Takagi T-T-KJr2-OS-LP is one of the best compact models from the Takagi brand. Despite its small size, it still manages to offer an impeccable flow of water to provide you with hot water for a few applications at a time.
- It is affordably priced
- Great energy efficiency rate for an outdoor propane water heater
- It has overheating, surge and freeze protection
- 6GPM is ideal for a variety of applications
- Compact size allows small space installation
- It is freeze-proof up to a certain degree, up to the water temperature of 30 F.
How does a Tankless Water Heater Work?
These water heaters deliver hot water on demand. Unlike traditional heaters, the water is not stored in a tank but runs from the source to the heater which has a set of coils or burners and then proceeds to the faucet for use.
They come with a rated maximum temperature at a given flow rate. If you are installing it to use with the shower, for example, you may have a fair idea of the temperature of the water from the source.
The demand also determines the temperature of the water. Say two people are taking a shower, the application of the water is higher which means it may not have enough time to heat before it is called to use again. The more the output fixtures, the cooler the water will be if you don’t choose the right size for your requirements.
That’s why you may need more than one tankless water heaters stationed at different demand locations.
What is the Right Size Tankless Water Heaters?
No one likes the idea of an ice-cold shower, but if your water heater cannot meet your household demands, you may be in for some unwanted cold baths.
Determining the right size water heater can be a tricky subject, but is important for the most fulfilling experience.
- How many appliances do you expect to run and what is their total flow rate?
Know the total flow rate from all your outlets. This is going to be the total demand flow rate of your water heater.
- What is your Desired Temperature Rise?
The temperature of the incoming water minus the temperature of the output water is the temperature rise.
If the water in your area tends to get too cold, you may need to increase the water temperature by more than 60degrees. But let’s assume your incoming water is at 490F. Your water heater will need to provide a temperature rise of 560F to get to the ideal temperature of 1050F.
Assuming you want to use the shower while someone else is running a bath, the shower will intake 2.6 gallons of water a minute while the tub will require 3 gallons of water a minute. Both of you will amount to 5.6 gallons of water a minute.
The water heater, in this scenario, should be able to raise the temperature of 5.6 gallons of water a minute by 560F.
Types of Tankless Water Heaters
The fuel that these water heaters use categorizes them into following types.
- Electric Tankless Water Heaters
These are the cheapest kind. They run on electric coils to heat the water as it is drawn into the heater. Their only drawback is that they are small so they are ideal for small to medium households with no excessive usage. If you want to stick to an electric model, you may need several units to meet the demands of a large home.
- Natural Gas Tankless Water Heaters
These heaters have the highest flow rates in a minute than their other counterparts. Natural gas water heaters are powerful units; thus, they are useful for large homes since you may need only one of them to provide the desired temperature rise for all your appliances. These models are the most expensive and will require ventilation and proper installation.
- Propane Tankless Water Heaters
Just like the natural gas water heaters, they use burners and heat exchangers to heat the water directly as it enters the unit. Propane heaters are generally smaller and surprisingly light in weight. Most units are quite energy efficient. The difference is in the way they burn the fuel, and are tricky to operate in confined spaces. They will need power vents for exhaust gases and yearly inspections.
How to Install a Tankless Water Heater
For installation, it is advisable to utilize the skills of a professional plumber. But if you are willing to go DIY, then you need to know how to turn off the water from the main supply line of your house and follow a few guidelines.
For a gas-powered water heater, you will need to:
- Install the required gas line for the water heater
- Install copper water lines for the new water heater
- Build a secure platform for the water heater. It should be a covered platform, with the vents passing through to the outside, in case you’re installing a natural gas or propane water heater
- Secure the water heater to the platform using screws
- Attach the gas shut-off valve and the sediment trap. Next, connect the stainless steel line (corrugated). Ensure it is tightly secured with nuts
- Connect the water heater to the water supply line
- Turn on the gas and check for any leakages through a gas sniffer
- Connect the venting pipes, connectors, and elbows
- Install the interior and external metal thimble from the outside wall
- Connect the water heater to the electric supply and perform proper insulation
- Turn the gas on and press the on/start button.
Maintaining a Tankless Water Heater
To keep your water heater efficient, it is vital to carry out maintenance at least once every year. You will need to remove limescale that will gather around the heat exchange elements over time. If left unchecked, you may experience longer burn times, accompanied by strain and an eventual lack of heating of the water. This would ultimately translate to a short service life.
The maintenance process usually involves flushing out the limescale using undiluted white vinegar. The filter should also undergo cleaning which involves running it under cold water.
The best way to ensure superior usage is to follow the manufacturer’s instructions that accompany the heater.
Advantages of a Tankless Water Heater
- Low Operation Costs
This is perhaps their biggest advantage. The fact that no water is on standby means that energy is not being used to keep the water hot until the time it is used.
They require very little installation space, for the most part. They can be mounted on the wall, under the sink, and any other position that demands hot water. Consequentially they’re very easy to use.
The longevity of these models cannot be underestimated. This is because any breakdown is quick to fix. All the parts in a tankless water heater are replaceable. In contrast, it is unlikely you will be able to replace a leaking storage tank on a tank-style water heater.
- Continuous Supply of Hot Water
Usually with a traditional water heater, if water runs out of the tank, you will need to wait for it to reach the ideal temperature before you use it. But tankless heaters heat the requisite amount of water directly from the source thus giving you an endless supply of hot water on demand.
- Low Maintenance
You don’t have to worry about the effect that the tank has on water. In traditional tank-style heaters, minerals deposit in the tank 24 hours a day. Tankless units eliminate mineral deposits and rusty water that could run through the pipe from the tank so you get to enjoy fresh water from the supply every day. The deposits can undermine the tank over time, resulting in possible extra expenditure.
Disadvantages of Tankless Water Heaters
- High Initial Costs
They cost way more than traditional water heaters. Some may even cost upwards of 3 times the cost of a conventional heater, which is a hefty difference. But on the flip side, you will be able to recoup all that cost because of lower energy bills over time.
- May not be Enough
These can only heat so much water in a minute. They may never deliver the right temperature if the demand is high. This means you may need to invest in a number of them to satisfy the needs of a large household, or invest in a bigger one suited for your requirements.
- Not all are Eco-Friendly
Electric water heaters are environment-friendly. But gas-powered models require to vent exhaust fumes, which means they are not exactly green. If you are looking to make better energy choices, an electric water heater may be a much better idea.
Why not upgrade to a tankless system with one of the models from our list. These units save on space, are energy efficient, and they guarantee a continuous flow of hot water. You can expect outstanding performance whether you want a small model for residential use or you are looking for high water flow rate for a large home or commercial use.
Our top recommendation for home is the EcoSmart ECO 27 Electric Tankless Water Heater. It is self-modulating to help it draw enough energy depending on the flow rate.
The Rinnai RUC98iN Ultra Series is an ideal pick for commercial use. With a flow rate of 9.8GPM, it provides one of the highest water-flows thanks to the use of natural gas.