10 Best Tankless Hot Water Heater – Buying Guide

Last Updated on April 18, 2021 by Michael

tankless hot water heaterThe best tankless hot water heater helps you save on energy costs and provide instant hot water. It has no water tank that requires constant heating to keep at the same hot temperature. So, the heater only heats water when you demand it. The plumbing experts will also advise and recommend a tankless heater for households. It is because these require less maintenance and lower your repair expenses. Therefore, the water heaters without a tank are best for residences and offices. However, before you decide to buy any, read its reviews. When you read its features, you learn a lot about its uses.

 

Is A Tankless Hot Water Heater Better?

The advantages of these tankless heaters are that they save spaces and provide instant hot water. There is no need for you to wait like in the case of traditional geysers. Also, these stop working when there is no demand for hot water. They have sensors and other intelligent features that make these last longer. So, reading these benefits, you might be considering buying one. That is why we have a review of the top ten heaters. All of these are tankless and come with the best features.

Best Tankless Hot Water Heater Review

1. EcoSmart ECO 11 Electric Tankless Water Heater

ecosmart eco 11

The EcoSmart ECO 11 Electric Tankless Water Heater comes with a lifetime warranty. All of the materials of this heater are of premium quality. Thus, EcoSmart is confident to provide a guarantee for life. It is a heater that uses Patented Self Modulation Technology. Also, the design of this product is patented. EcoSmart has years of experience in producing quality heaters and accessories. This brand provides innovative heaters for the home or office use. It is why Amazon suggests this model. The electric heater is easy to install and takes less space.

The design of this water heater lets you mount it anywhere you want. There is an LED that shows the temperature. Its self-modulation tech uses energy only if it needs to. Therefore, it saves energy from wastage. So, the electricity bills will be lower. This model from EcoSmart uses 13KW and provides 1-3 GPM. The digital temperature control lets you set the temp from 80 to 140° F. There is a digital LED that shows the numerical temperature value. All of its elements are replaceable for easy maintenance or repairing. These features make it one of the best water heaters at an affordable price. Read more about it.

Pros
  • The price is budget-friendly.
  • It saves on energy costs.
  • There is a lifetime warranty for the heater.
  • The flow rate is 1-3 gallons per minute.
  • There is digital temperature control.
Cons
  • It is best for medium size family homes.

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2. Bosch Electric Mini-Tank Water Heater Tronic 3000 T (Best Point of use)

Best tankless hot water heater

It is a mini water heater that you can install under the sink, floor, or mount on a wall. The Bosch heater provides hot water to three sources at the rate of 4 gallons per minute. You can use it for RVs, offices, baths, kitchens, shops, and homes. There is a thermal efficiency of 98% for this water heater. Thus, it allows you to save on electricity bills. All of the materials of this water heater are of premium quality. That is why these last long, and there is less need for maintenance.

The Bosch Electric Tronic 3000T electric heater delivers instant hot water to two sinks simultaneously. The size of this heater is compact, but it performs like any standard water heater. Also, you can select the 2.5 gallons, 4 gallons, or 7 gallons capacity heater as per your need. It has a glass-lined tank for durability and quality service. There is thick CFC-free foam insulation for better heat performance. So, you can use it for three different applications. It can also supplement an existing water heater.

Pros
  • It is compact.
  • You can install it with comfort.
  • The water heater is best for RVs, boats, offices, and homes.
  • There is a glass-lined tank.
  • All of the materials are of high quality.
  • There is a bracket for mounting on a wall.
Cons
  • It is best for tiny homes or apartments.
  • It is a bit pricey.

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3. Rheem RTEX-18 18kW 240V Electric Tankless Water Heater (Best Value Electric)

tankless hot water heater

The Rheem RTEX-18 18kW electric tankless water heater comes with a LED display. There is a digital thermostat that you can control with comfort. All of the materials of this heater are of premium quality to make it durable. Thus, it is on the third spot in our top ten list. These features make it one of the best heaters for getting instant hot water. You can install it under the sink, mount it on the wall, or anywhere else. This tankless heater will save on energy costs. Also, it is best for baths and getting hot water in the showers.

Installing this water heater is simple because of the 3.4-inch NPT connectors. It can provide a flow rate of up to four gallons per minute. So, you can use two sinks at a time. The durable copper immersion and the two heating elements are serviceable on the field. Thus, the heater is durable and will last for many years. There will be less need for maintenance or repairs. The digital temperature display makes it easy to read the water temperature. Plus, you can change the thermostat using digital controls. Therefore, Amazon also suggests you buy and take advantage of it.

Pros
  • There is an external digital thermostat with controls.
  • It has an LED display for temperature reading.
  • All of the materials are of high quality.
  • There is self-modulation technology.
  • The flow rate is up to 4.4 GPM.
Cons
  • It is expensive.

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READ: How to Install Tankless Water Heater in Bathroom

4. Rinkmo Electric Tankless Water Heater (Best for RV)

Best tankless hot water heater for rv

The Rinkmo tankless electric water heater comes with many features at an affordable price. It is an 11KW tankless heater that is best for baths, kitchens, RVs, and offices. This water heater requires two 30AMP breakers and two 12AWG wires. So, it functions well and saves on energy costs. There is a high flow rate of 1.5 liters per minute for this heater. All of the materials are durable. It will operate for many years because the design keeps electric and water components apart. Thus, you will be safe from maintenance or repair expenses.

 

The Rinkmo tankless heater is high-efficient and reduces your utility costs up to 60%. It is because the electric heater is 97 to 98% economical. The heater stays away from corrosion because the electric and water parts are separate. This water heater takes only three seconds to heat the water. So, you will not have to wait like the traditional heaters. There is an LED that shows the temperature. Also, the LED displays the LL or HH alarm when the inlet water temp is below 37°. All of the design uses the silicone wires for durability.

Pros
  • The price is budget-friendly.
  • There is a LED.
  • You can control the temperature with a digital temp display.
  • It uses all silicone designs.
  • All of the materials are of high quality.
  • There will be no corrosion.
Cons
  • It is for medium size families.

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5. Rinnai Indoor Tankless Hot Water Heater, V65iP, Propane, 6.3 GPM (Best Value Gas)

Best tankless hot water heater reviews

The Rinnai V65iP propane tankless heater is the best economical solution for your home or office use. There are many benefits of an electric water heater. However, these electric heaters consume electricity and cost you. Therefore, a propane heater is more budget-friendly. You can connect this water heater with a Smart App. Also, these heat water fast and have higher flow rates. Thus, the Rinnai Indoor heater has a high flow rate of 6.5 GPM. Plus, controlling the features using a Smart app is more reliable. You can set the water temperature or turn on the vacation mode.

You can install it for using hot water at kitchens, baths, washing laundry, or dishes. There will be no shortage of hot water because the gas tankless heater has higher flow rates. The Control-R 2.0 mobile app lets you use daily schedules and control its features. There is a 120-months warranty for this product. Also, the brand provides a 60-month parts warranty and a 1-year warranty for labor. Hence, all of the materials for this heater are tested and durable. The design and compact size also let you save space when installing it.

Pros
  • The natural gas heater is economical to use.
  • It has a flow rate of 6.5 GPM.
  • There is a 120-months warranty.
  • You can control it using a Smart app.
  • There is a LED for displaying temperature.
  • The temperature is easy to set using touch controls.
Cons
  • It is expensive.
  • A professional needs to install it.

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6. Happybuy Tankless Water Heater Propane 18L

happybuy

The design uses stainless steel and heat-resistant materials. The Happybuy tankless heater uses 36KW power and natural gas supply. So, you can use it with electricity or natural gas, as you demand. All of the materials for this water heater are of high quality. It has a flow rate of 4.8GPM when using 36KW electricity.

There will be no water leaks or any other problems. There are 6-in-1 multi protections for this water heater. Its flow rate increases when it uses natural gas. It can heat the water from 50 °F to 140 °F. It has an LED screen and knobs.

Pros
  • The materials are high temperature resistant.
  • It can use electricity and LPG, or natural gas.
  • There are multi protections for the heater built-in.
  • You can adjust water temperature using knobs.
  • It has summer and winter operation modes.
  • You can mount it on a wall.
Cons
  • It is expensive.
  • A professional needs to install it.

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7. Stiebel Eltron Tankless Water Heater (Best for Large Family)

stiebel eltron

The Stiebel Eltron water heater without a tank provides continuous hot water. It is possible because of its Advanced Flow Control patented technology. You can never run out of hot water when taking showers. Another benefit of this water heater is that it is compact and easy to install. This electric heater is best for baths, kitchens, homes, and offices. There are premium quality materials that make it durable. It has an eco-friendly design with energy-saving features. So, it helps to lower your electricity bills. There are no loud noises when it heats the water. Also, it has a digital temperature display.

The heater can heat water from 68° to 140°F. It comes with a 3-year warranty for the parts and a 7-year warranty for leaks. All of the interior use a solid copper heating system. It has a power rating of 24KW and requires 150A of minimum electricity. Some monitors let save energy and lower your expenses. It is best for use for the whole house or the offices. These are the reasons why Amazon recommends it.

Pros
  • There are preset temperature and memory buttons for this water heater.
  • It is easy to operate.
  • There are LED and digital temperature controls.
  • All of the materials are durable and long-lasting.
  • It comes with a 3-year parts warranty.
Cons
  • The system is expensive.

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8. Thermoflow 12KW at 240V Tankless Water Heater

Thermoflow 12KW

The Thermoflow 12KW electric tankless heater heats the water fast and has a flow rate of 2.34 GPM. It is best for small apartments or tiny homes with medium size family. This water heater lets you save on energy costs. There is a 2-year warranty for this water heater. All of the materials are of premium quality and build. Also, there is an LED display for checking or adjusting the temperature. The design of this heater is compact and easy to install. You can mount it on a wall or fix it under the sink. However, it requires a power source.

There is self-modulation technology that lets you save energy. Plus, this ensures a steady hot water flow in any case. It has an electronic temperature control that makes sure you get uninterrupted hot water. So, it is best for small apartments and baths. Installing it is easy, and there are all accessories inside the package.

Pros
  • It has electronic temperature controls.
  • There are LED and digital temperature adjustments.
  • The design is compact and durable.
  • It saves up to 50% of energy.
  • You can mount it on a wall.
Cons
  • It is best for small apartments or homes.

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9. ECOTOUCH Tankless Water Heater Electric 240V (Best budget)

tankless hot water heater reviews

When you need instant hot water inside the baths or at the kitchen sink, the ECOTOUCH heater is the best. It is a compact and 5.5KW rated water heater. However, its compact size by no means undermines its performance. This heater for water in baths and faucets has a flow rate of 1.2 GPM. Also, some sensors monitor for saving energy and heating water with optimum proficiency. The digital temperature control and the LED display show the adjustments and temperature. Some of the protections it has are overheating dry heating and leakages protection.

The ECOTOUCH heater adjusts hot water temperature automatically. It uses 5.5KW of electricity. Whatever the flow rate is and the temp is, it will set temp accordingly. So, there are no sudden shortages of hot water in the baths or the kitchens. You can install it under the sink or mount it on a wall.

Pros
  • It has a digital temperature display and controls.
  • The flow rate is 1.2 GPM.
  • There is automatic adjustment of water temperature.
  • All of the materials are durable and of premium quality.
  • It has a touch panel control.
  • The price is budget-friendly.
Cons
  • It is best for small homes or apartments.

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10. Marey ECO110 220V Self-Modulating 11 kW

Best tankless hot water heater 2021

This water heater comes from a German design and has a rating of 11KW. It is the best tankless electric heater for use in apartments or tiny homes. There is a corrosion-free patented design and materials for this heater. That is why it will last longer than most water heaters. Also, all of the parts and connectors are of high quality. All of the focus is on the hot water delivery and durability of the product. It is easy to adjust hot water temperature because of the touch panel. There is an LCD that shows the setting controls and the temperature readings.

The electric heater from Marey saves up to 60% of energy. Thus, it helps you save on utility bills. It can support a sink and a shower at the same time. However, if you want a water heater for multiple baths, it is not the one. It is best for bachelors and small-size family homes. The company provides a 5-year warranty for the Marey ECO110 water heater.

Pros
  • It comes with a 5-year warranty.
  • There is an LCD touch panel with a display and settings.
  • The water heater saves up to 60% of energy.
  • All of the materials are of premium quality.
Cons
  • It is for small size apartments or homes.

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What Is The Best Tankless Hot Water Heater To Buy

Here are a few things that you need to know when you decide to buy the best tankless hot water heater. There are many brands and different features to choose from. Thus, you can use these tips to understand it better.

Price

The price of the tankless water heater depends on its capacity to heat water. The higher flow rate and more energy-consuming units are pricey. It depends on the number of users and the demand for hot water. So, if you are two or three, an 11KW or small capacity heater is enough.

Features

The features of a tankless water heater can be its ability to use electricity or natural gas. Also, many have digital temperature controls and LEDs. There are some with touch panel controls and flow rate sensors. However, the more features it has, the more expensive it will be.

Installation

It is better if you hire a professional who knows to plumb and about electric tankless heaters. In case you know how to install it you can. Also, some of the States require an official inspection and license to use natural gas or electric water heaters.

Maintenance

Most of the electric and natural gas tankless water heaters need no maintenance or repairs. Also, these come with a 1-year to a 5-year warranty for the parts and product. However, in case of repairs, you can call an expert.

 

Frequently Asked Questions (FAQs)

What are the most trusted tankless water heater brands?

The Bosch, EcoSmart, ECOTOUCH, Stiebel, Thermoflow, and Rinkmo are popular brands.

Is there a warranty for the water heaters without a tank?

Most of the tankless water heaters come with a 1 to 5-year warranty.

Is there a need for maintenance?

The electric or gas heaters without a tank do not require regular maintenance. However, you can ask an expert to check it every once a year for leaks or other problems.

Where to buy it?

You can buy these from online stores or supermarkets. You can also buy these from Amazon with confidence.

Conclusion

When you want to buy the best tankless hot water heater for home, RV, or office use, you can use our reviews. We present the top ten tankless heaters that are best for home or office use. There are electric and natural gas heaters. Also, there are mini and standard-size water heaters. So, you can buy the one that suits your hot water demands.

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