Looking for an efficient & convenient way to heat your water? A tankless water heater might be the perfect solution. Tankless water heaters are becoming increasingly popular due to their ability to provide hot water on demand while being more energy-efficient than traditional tank-style water heaters. With the best tankless water heater, you don’t need to worry about running out of hot water or dealing with a tank that takes up valuable space.
When shopping for the best tankless water heater, it’s essential to consider the size of the unit, the type of fuel used, and its energy efficiency. To help you make the best choice, I’ve rounded up the best tankless water heater on the market today.
Benefits Of Owning The Best Tankless Water Heater
Tankless models offer many benefits and often have a more expensive upfront cost. Despite the initial expense, you may be able to get a refund from the government and save up to one-third of your costs compared to a traditional storage-tank water heater.
The best tankless water heater is highly advantageous because they require very little area compared to traditional water heaters since they don’t need to keep a large quantity of water stored beforehand to supply enough hot water to your property. The quick warming process allows you to utilize your house’s comforts without abandoning the shower or laundry cycle.
- Tankless water heater saves you money and energy.
- This water heater offers instant access to hot water.
- The best tankless water heater takes less space than storage-tank water heaters.
Comparison Of Best Tankless Water Heater
IMAGE | MODEL | FEATURES | COST | RATING |
 | Rinnai Indoor Tankless Hot Water Heater | 7.5 Gallons capacity, Natural gas power source, Smart and Durable design | CHECK PRICE | 4.5 / 5 |
 | EcoSmart ECO 18 Electric Tankless Water Heater | 18000 watts, ac_dc power source, 75 amperage | CHECK PRICE | 4.5 / 5 |
 | Rheem Tankless Electric Water Heater | Adjustable digital temperature display, Corded electric power source, Self-modulating power control | CHECK PRICE | 4.2 / 5 |
 | Stiebel Eltron Tankless Water Heater | Requires hard wiring power source, Offers 68° to 140°F output water temperature, Eco friendly unit | CHECK PRICE | 4.6 / 5 |
 | Rinnai Outdoor Tankless Hot Water Heater | 5.3 Gallons capacity, Natural gas power source, Endless hot water | CHECK PRICE | 4.5 / 5 |
 | EcoSmart ECO 11 Electric Tankless Water Heater | Endless on-demand hot water, 2 Gallons capacity, ac_dc power source | CHECK PRICE | 4.4 / 5 |
 | Hike Crew Portable Propane Water Heater | Convenient compact design, Comfortable campsite showers, Sleek LCD display | CHECK PRICE | 4.1 / 5 |
 | EcoTouch Point-Of-Use Tankless Water Heater | 9 Liters capacity, 240V/60Hz power source, Instant & endless hot water | CHECK PRICE | 4.2 / 5 |
Best Tankless Water Heater In 2023
Rinnai Indoor Tankless Hot Water Heater
SPECIFICATIONS
- 7.5 Gallons capacity
- Natural gas power source
- Smart, Durable design
- Requires professional to install
TODAY’S BEST DEALS
| PROS | CONS |
| + Super efficiency heater + Energy-saving benefits + Saves valuable space + Constant hot water + Easy installation + Great value + Durable | – Customer support needs improvements |
This gas-powered tankless water heater has a higher flow rate than electric models. It is installed indoors to keep the cold air from impacting its heating performance.
Rinnai heater is perfect for medium- and large-sized homes with a 7.5 GPM flow rate. It is easy to install, has a quiet operation, and saves money on utility bills.
This tankless water heater only heats when it is necessary to conserve energy. It fits in many spaces but offers up to 7.5 GPM (5 fixtures at once).
Rinnai heater has an enhanced scale detection that prevents severe and long-term damage to the unit. It is easy to install. In addition, you’ll be able to reuse the vent system.
This heater provides consistent hot water with accurate temperature control features. It has excellent & easy to follow installation instructions.
EcoSmart ECO 18 Electric Tankless Water Heater
SPECIFICATIONS
- 18000 watts
- ac_dc power source
- 75 amperage
- 0. 3 GPM activation flow
- Lifetime warranty (for residential use)
TODAY’S BEST DEALS
| PROS | CONS |
| + Endless hot water + Saves energy, time & space + Highly durable + Easy to use + Simple to install + Affordable | – Weak tech support |
ECO 18 tankless water heater falls in the middle of electric units and has a 1.8 to 4.3 gallons per minute flow rate.
It has an adjustable temperature setting that lets you modify the water temperature generated in single-degree increments ranging from 80 to 140 degrees Fahrenheit.
With the most advanced, self-modulating technology, this water heater saves 60% on water heating costs.
ECO 19 water heater is a fantastic unit that takes up very little room and saves money on heating water. It saves up to 12 cubic feet of storage space.
This tankless water heater is easy to install, reliable and affordable. If you have a 240v 40 amp set up, you can quickly install it!
Rheem Tankless Electric Water Heater
SPECIFICATIONS
- Adjustable digital temperature display
- Corded electric power source
- Self-modulating power control
- 1.95 GPM flow rate
- 240 volts
TODAY’S BEST DEALS
| PROS | CONS |
| + Saves water, money, energy, and space + Great for warmer climates + Excellent small heater + Powerful performance + Optimized operation + On-demand hot water + Good quality heater | – Low flow rate |
This electric water heater is equipped with a controllable cord and has a visually-appealing easy read temperature indicator.
Located beneath the display is a control knob which makes it easy to choose the preferred water temperature. This handy heater can be fitted beneath any sink.
This tankless water heater is effective. It quickly heats water when you need it and when you don’t need water, it gets turned off and saves electricity.
Rheem heater offers up to 5.9 gallons of hot water per minute (GPM) in warm climates, enough for 3 showers at once. It provides continuous hot water but at reduced flow rates. Digital temperature control on the front of each model allows easy set-point adjustment.
This heater doesn’t require venting, so it can be installed anywhere inside the home. It is excellent in warmer climates.
Stiebel Eltron Tankless Water Heater
SPECIFICATIONS
- Requires hard wiring power source
- Offers 68° to 140°F output water temperature
- Eco-friendly unit
- 24kW, 240V
- 18000 watts
TODAY’S BEST DEALS
| PROS | CONS |
| + Great unit for colder weather + Small, sleek white design + Easy to install + Energy-efficient + Affordable | – Definite design flaws |
This electric tankless water heater can produce between 1.5 and 4.5 gallons of water every minute. Furthermore, its advanced self-adjusting technology and small size guarantee continuous energy savings with no ventilation requirement.
Stiebel heater has advanced flow control patented technology that automatically maintains water temperature for constant comfort. It provides endless hot water for your whole house.
This eco-friendly unit saves energy with auto-modulation & can electronically control water flow. The electronic switch activates the water heater, and it’s noise-free.
You’ll like the longevity and reliability of this water heater. It has worked for more than 10 years. In addition, it is beautifully designed and is available at a very reasonable price.
Rinnai Outdoor Tankless Hot Water Heater
SPECIFICATIONS
- 5.3 Gallons capacity
- Natural gas power source
- Endless hot water
- Enjoy energy-saving benefits
TODAY’S BEST DEALS
| PROS | CONS |
| + Amazing tankless water heater + Saves energy and space + Super high efficiency + Easy to install + Great value + Compact + Durable | – Not enough information for proper install |
This gas-powered water heater is usually placed on the house exterior, making it the most suitable selection for residents with limited space to put it inside or for people who don’t want to set up an exhaust system with the heater.
The Rinnai heater is lightweight (33 pounds) and easy to install. It has a space-saving design that conserves energy as it heats only when necessary.
The heater has a high performance of 5.3 GPM hot water flow rate for a powerful and constant stream. It has enhanced scale detection, reducing the possibility of severe and long-term damage to the unit.
Rinnai tankless water heater offers the most advanced technology with comfort and value. You will like this heater’s efficiency, ease of operation, temperature control, and savings.
EcoSmart ECO 11 Electric Tankless Water Heater
SPECIFICATIONS
- Endless on-demand hot water
- 2 Gallons capacity
- ac_dc power source
- 13KW, 240 Volts
TODAY’S BEST DEALS
| PROS | CONS |
| + Saves energy, time, and space + Very small and powerful + Endless hot water + Energy-efficient + Easy installation + Great performance | – Minor issues |
EcoSmart water heaters are 90% smaller than traditional tank heaters. It might be installed on a wall or at the point of use.
This water heater is 99% thermal energy efficient. It is ideal for hot water for a bathroom, small sink, office breakroom, and other point-of-use or low-flow applications.
EcoSmart heater has a 1.3–3.1 GPM low flow rate and is enough for a small household of 1-2 people. It provides consistent performance within just 1 degree temperature.
This heater is easy to set up, provides consistent performance, and does energy savings. It comes with a convenient temperature adjustment knob.
Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of the selected temperature.
Hike Crew Portable Propane Water Heater
SPECIFICATIONS
- Convenient compact design
- Comfortable campsite showers
- Sleek LCD display
- 12V/5A DC input voltage
- Propane gas type
- Portable
TODAY’S BEST DEALS
| PROS | CONS |
| + Awesome device to have in your camping supplies + Amazing outdoor showers + Superior safety features + Instant water heater + Value for money + Easy to use + Affordable | – Quality needs improvements |
The Hike Crew heater combines a house’s comforts with camping toughness.
An in-built pump is positioned into a water body and fixed to a propane tank to supply endless hot water for showers while camping, cleaning dishes, and purifying tools. The top handle acts as a carrying case system.
The Hike Crew heater is portable & includes a hand tap and shower head to provide hot water wherever you want. It can either be powered by AC or DC.
This small device features an emergency cutoff that activates when the water supply runs out or the temperature reaches 125°F.
This lightweight and movable appliance has a capacity of 1 gallon per minute and 42,000 BTUs, making it portable but inappropriate for any other purpose.
EcoTouch Point-Of-Use Tankless Water Heater
SPECIFICATIONS
- 9 Liters capacity
- 240V/60Hz power source
- Instant & endless hot water
- Smart self-modulation
- Upgraded heating system
TODAY’S BEST DEALS
| PROS | CONS |
| + Energy-efficient + Easy to install & use + Safe & durable + Premium quality + Lightweight design | – Customer service needs improvements |
The 1.5 GPM and 30,500 BTU are unsuitable for a normal tankless water heater. However, this heater is sufficient to provide hot water to a single bathroom or kitchen when used as a point-of-use unit.
This system has a 99 percent effectiveness rate, implying that hardly any warmth is squandered before the water gets to your shower, fixture, or installation.
The compact size and smooth, user-friendly interface blend with contemporary home designs, making the heater a decorative piece.
The self-modulation control keeps an eye on the water temperature to stop it from changing between hot and cold during operation.
This machine provides warmth throughout the house but could be an excellent hybrid choice for a main bathroom.
Buyer’s Guide On The Best Tankless Water Heater
Here are some factors to consider before you pick the best tankless water heater:
Indoor vs. Outdoor
If you do not have enough room in your house or cannot set up the ventilation system required for a gas-powered water heater, then an outdoor heater is a viable solution.
Nevertheless, solar water heaters are less effective during winter as they are directly exposed to freezing temperatures, requiring them to exert more effort to warm the passing water.
Use
Before figuring out the best tankless water heater, consider how your family will use it. If you are considering replacing your conventional tank heater, a large-capacity whole-house tankless water heater might be the optimal choice.
A mini point-of-use water heater may meet your requirements if you’re trying to find a hot water system for an extra room, a bar setup, or to avoid an extended plumbing line.
Installation
Installing electric water heaters is simpler than gas-powered ones due to their modest size, allowing them to fit into a wider range of spaces. Once you have selected the ideal location, attach the water heater to your electricity supply and plumbing.
Suppose you decide to put in a gas-operated water heater inside your house. In that case, you must ensure it is adequately ventilated so that the hazardous gases produced by the burning fuel do not linger and contaminate the air in your home.
The installation of this device is not only expensive and time-consuming, but it also restricts where you can place it since you need to make room for the unit, air vents, and air ducts.
Power Source
Tankless water heaters utilize electricity or gas for power.
- Electric – Electric water heaters are linked to one’s residential electrical setup. As the fluid flows through the device, a detector in the heating element initiates the burner, and a thermostat starts functioning to heat the water to the selected temperature. An electric water heater is usually cheaper than a gas-powered one. However, it is not as effective when heating the water.
- Gas – Gas-fired water heaters are more economical, making it possible to heat enough water to run multiple machines simultaneously. It is possible to divide them into two groups based on whether they contain one or two heat exchangers, namely non-condensing and condensing.
- Non-condensing – A non-condensing unit comes with a heat exchanger. It produces exhaust around 300 degrees Fahrenheit. This unit wastes excess heat that could be utilized to warm more water. However, it is more affordable than its condensing counterpart. The unit and installation cost is less because you can use the same ventilation from previous gas-powered tank-style water heaters.
- Condensing – Compressed water warmers have a subsequent warming framework that takes the hot fumes created by the first warming framework and utilizes it to heat more water. Although the price of this water heater is higher than a non-condensing version, the product’s energy efficiency allows you to save money in the long term.
Flow Rate (GPM)
The capacity of tankless water heaters is calculated by their gallons per minute (GPM) output of hot water. The flow rate of electric water heaters is lower than non-condensing gas heaters, and the flow rate of non-condensing gas heaters is lower than condensing gas heaters.
When deciding how much water flow rate is necessary, consider the number of appliances you want to use concurrently and the amount of water each device needs. For instance, a kitchen tap needs a flow rate of 0.5 gallons per minute, a shower head requires 2.5 gallons per minute, a dishwasher requires 1 gallon per minute, and a washing machine needs 1.5 gallons per minute.
If you plan to use the dishwasher and shower simultaneously, you will need a unit with a minimum flow rate of 3 gallons per minute to keep up with your usage.
Maintenance And Warranty
The frequency of maintenance for a tankless water heater depends on the model and type. It is advisable to have it serviced by a professional on an annual or semi-annual basis. As a result of the mineral content (commonly referred to as “hard” water) in various water sources, a specialist may need to descale your tankless water heater.
It is essential to have a qualified technician install the new tankless water heater to ensure the validity of the manufacturer’s warranty.
Capacity
Capacity is the amount of hot water a tankless water heater provides. When you have determined whether you should get an entire house water heater or a point-of-use water heater, you have to figure out the maximum hot water capacity that the water heater provides. This will determine the size of the best tankless water heater.
The number of inhabitants in your residence, the expected temperature increase, the maximum flow rate, and the local weather conditions determine the size of the best tankless water heater. Sizes are expressed in kilowatts for electric water heaters or BTUs for gas water heaters.
Power Source | Water Heater Cost | Installation Cost | Energy | Cost Availability |
| Electric | Low | Low | High | Very common |
| Natural Gas | Medium | High | Low | Common |
| Propane | High | High | Middle | Less common |
FAQs (Frequently Asked Questions) On The Best Tankless Water Heater
1. What are the drawbacks of a tankless water heater?
A tankless water heater can heat surplus water at one time. The water temperature will fluctuate if you want more hot water than the unit can generate. For instance, if you’re running the dishwasher, washing machine & shower simultaneously, the heater will provide water at all three locations.
2. What is the most common problems with tankless water heaters?
Here are the six common problems with tankless water heaters:
- System overload
- Air supply or exhaust blockage
- Flame failure
- Mineral buildup
- Cold water sandwich
- Ignition failure
3. How do I choose a tankless water heater?
You need to consider two things before buying a tankless water heater. One is the flow rate, meaning the water measured in gallons per minute for a fixture or appliance. And the other is temperature rise, which is the difference between groundwater and desired hot-water output temperatures.
Summary: Best Tankless Water Heater
The Rinnai Indoor Tankless Hot Water Heater is an excellent option for providing constant hot water. This unit plugs into the electrical source and produces up to 1.95 GPM hot water.
In addition, the unit is equipped with a digital temperature display and a control knob. This allows you to adjust the flow rate and the desired water temperature.
The unit also offers an instant heat-up function. This makes sure that you get hot water whenever you need it.
Each house has its own needs, and sometimes you must decide between matching a tank-style water heater against a tankless water heater. Although both options can offer you hot water, you should choose the best tankless water heater for your home to provide you with the most affordable and effective hot water.
I hope this article on the best tankless water heater sounds helpful!
