Best Indoor Tankless Water Heater

Mostly of the tankless water heaters are indoor installation, they are more convenient in using and has long service life. Because of the hot demand, there are many brands and many types of indoor tankless water heaters on the market of 2019. In order to better help you choose the most suitable one, we made detailed reviews of best indoor tankless water heater for you.

Best Indoor Tankless Water Heaters Reviews

There are many brands and types of indoor tankless water heaters on the market of 2019, in order to help you choose the most suitable one, we have made detailed reviews for you as follow:

1. Rinnai RUC98iN Ultra Series Tankless Water Heater

tankless water heating systems for homes
residential tankless water heater

Feature:

  • 9.8 gpm flow rate

The flow rate of this unit reaches as high as 9.8 gallons, it is able to support three or four bathrooms use the same time. High flow rate of it also enables to supply constant hot water for you. It takes up 20 seconds for water to heat up in the units.

  • 2 venting options

It offers two venting options, one is concentric PVC and the other is twin pipe, so you can choose whichever is easy to be installed. Temperature of it can reach as high as 185 degrees F, making it possible for commercial use with commercial remote.

  • Energy efficient

The power requirements range from 15200 to 199000 BTU per hour, the higher power requirements are, more powerful as it be. The energy efficient rating is as high as 0.95. But it needs only 2 watt to keep machine up and running.

Pros:

  1. 2 venting options
  2. High energy efficient
  3. Quiet working performance
  4. Unlimited hot water
  5. 5 years warranty on the part
  6. Multiple faucets and showers use simultaneously

Cons:

Need to be installed by professional


2. Rinnai V65IN 6.6 GPM Indoor Low NOx Tankless Natural Gas Water Heater

best indoor tankless water heater
tankless water heater for a house

Features:

  • Low NOx design

This unit meets California and Texas NOx Emissions Standards, maximum BTU is 150000, and maximum energy factor is 0.82. Being a natural gas indoor tankless water heater, it is quite energy efficient.

  • 6.6 gpm

The flow rate of this unit is 6.6 gallons per minute, it can handle two showers use the same time in warm areas. It supports constantly hot water for you.

  • Special venting

One thing you need to be aware is that it requires special venting and needs to place near an outside wall for venting, it requires the aluminum interior vent pipe with PVC outer pipe.

Pros:

  • Light weight and compact design
  • Quiet working condition
  • One button turn on and off for vacation
  • Constantly hot water supply
  • 10 year warranty for heating exchanger
  • Easy installation

Cons:

Needs special venting


3. Stiebel Eltron Tempra Plus 24 kW Tankless Water Heater

residential tankless water heater
home tankless water heater

Features:

  • 5 gallons per minute water flow

The unit provides about 5 gallons of water per minute, which is high flow rate machine. It is able to raise the water by 54 degrees F at 3 gpm. It has built in advanced flow control modules to regulate water pressure by itself.

  • Stable temperature

It has advanced flow control system in order to control water temperature in different flow levels, it is suitable for people in demand of occasional hot water. It has high level electronic parts and a reliable cover to promise long service life of it.

  • Energy efficient

Stiebel boasts that the energy rating reaches as high as 99% and full power modulations enable large power of the machine. Also, it adopts self modulating technology to save more energy.

Pros:

  1. Quiet working condition
  2. Compact design, perfect for small studio use
  3. Ideal in places where supplied water is under 45 degrees F
  4. Full power modulation
  5. High technology adopt

Cons:

Difficult to install, need 240v power and heavy duty wiring


4. Eccotemp FVI-12 Natural Gas Tankless Water Heater

best indoor tankless water heaters
best tankless water heater home use

Features:

  • 3.6 gpm

Flow rate of this unit is 3.5 gallons per minute, it is able to provide one shower and one low rated kitchen faucet the same time. It is said to have a high capacity, but actually it is ideal in studio family use.

  • Digital temperature control

Temperature shows on the screen of the unit, and two buttons are set to adjust the water temperature, one is for flow rate while the other is gas settings. But it is quite difficult to adjust to the exact temperature you want.

  • Stylish compact shape

It is designed light and compact, occupying only small piece of land of your home. It adopts safe electronic ignition system, you can plug it into standard 120v electrical outlet with UL-listed cord.

Pros:

  1. Energy saver
  2. Deliver hot water in a few seconds
  3. Efficient power ventilation
  4. Perfect for small house use
  5. Manual water temperature control
  6. Digital temperature control

Cons:

Hard to get temperature you want exactly


5. Takagi T-KJr2-IN-LP Indoor Tankless Water Heater

best tankless water heater for apartment
best residential tankless water heater

Features:

  • 150 degrees F temperature

Maximum temperature of this unit reaches as high as 150 degrees, perfectly meets the demand of residential use. It demands minimal maintenance during whole using process.

  • 6.6 gpm flow rate

Flow rate of the unit is up to 6.6 gallons per minute, it provides constantly hot water no matter for the climate or season. But in cooler region, the flow rate may drop to 3-5 gpm.

  • Light compact size

It is the lightest and smallest one among all the Takagi products, you can easily install it anywhere you want. Power input of it is 140000 BTU per hour, and energy efficient reaches 81%. But as a propane tankless water heater, it has more upfront costs in venting the gas to outdoor.

Pros:

  1. Digital remote enabled
  2. Multiple bathroom use available
  3. Demands minimal maintenance
  4. Light weighted
  5. Easy to be installed

Cons:

The working noise can be heard


6. Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater

residential tankless water heater reviews
indoor tankless water heater reviews

Features:

  • 185 degrees F temperature

Maximum temperature of it reaches as high as 185 degrees F, able to meet the demand of both residential and commercial use. But the waiting time of the hot water may be a bit long, takes around 1 minute.

  • 10 gpm large flow rate

This units provides 10 gallons per minute of water flow, the huge flow rate provides you with constantly hot water. It demands 199000 BTU per hour to perform in the best way, which is a highly powerful natural gas tankless water heater.

  • Set up simply

It is easy to set up, just adding several gas line. Venting facilities are needed for venting gas to outdoor. It weights light and has compact shape, can be installed anywhere you want.

Pros:

  1. Remote control available with controller
  2. High temperature range
  3. Powerful enough
  4. Commercial & residential use
  5. Light weight and compact shape
  6. Huge water flow

Cons:

Needs to be installed by professionals


7. Naiven NPE-240-A Tankless Gas Water Heater

indoor tankless water heater
top rated indoor tankless water heater

Features:

  • ComfortFlow technology equipped

This unit is regarded as high technological tankless water heater, it has built in hot buffer tank and recirculation pump, in order to eliminate cold water sandwich and save water bills by reducing the waiting time for hot water.

  • Stable water temperature

Temperature of it keeps stable all the using time, the internal technology enable it quickly correct the temperature once it draws stop suddenly. External interface shows water temperature and error codes. You can turn the machine off easily with the button.

  • Condensing technology

The condensing technology of it recovers the unused extra heat to reduce energy consumption and carbon dioxide emissions. It keeps exhaust temperature low, it provides up to 0.97 UEF, which is highly energy efficient type.

Pros:

  1. Hot buffer tank and recirculation pump built in
  2. Clear installation and using instructions
  3. Short waiting time for hot water.
  4. Intelligent preheating technology
  5. Easy operated
  6. Powerful
  7. Large flow rate enabled

Cons:

Slight working noise can be heard


8. Atmor 27kW/240V Electric Tankless Water Heater

best tankless water heaters for home
best home tankless water heater

Features:

  • Digital temperature control

The digital temperature control enables you set water temperature in increments of 1 degrees, temperature and error codes shows on the scree. Easy operation setting makes it easy to adjust the temperature accurately.

  • Advanced ThermoPro technology

It is equipped with advanced Atmor’s ThermoPro self modulating sytem, it regulates the amount of energy required to heat water. And it is able to automatically detect water flow, turn it on and off by itself, so as to eliminate wasted water flow and lower the water consumption.

  • 90-135 degrees F

Temperature range of the unit reaches between 90-135 degrees F, it proves to save about 50% electricity bill each month. Durable stainless steel interior and corrosion resistance performance allows for high heat efficiency and longer life expectancy.

Pros:

  1. set temperature in increments of 1 degree.
  2. Durable stainless steel interior
  3. Save 50% on electricity bill
  4. Self modulating system regulates the amount of energy required to heat water
  5. Automatically detect water flow
  6. Small footprint

Cons:

Need to install a pressure relief device, and you need to buy it from manufacturer


9. Eccotemp i12-LP Liquid Propane Indoor Tankless Water Heater

best tankless water heater for home
best indoor tankless water heater

Features:

  • 3 gpm flow rate

The flow rate of this unit is 3 gallons per minute, it activates only when hot water is demanded, no pilot light is needs and much energy consumption is reduced. It is said to use as whole home tank, supporting two things the same time, but we still suggest it to be used for tiny or small home.

  • Modern design

Sleek modern design and easy operated LED display control enables to adjust water temperature easily. Black tempered glass front panel is set to show temperature, automatic temperature controls with energy saving mode and child lock technology is set for avoiding unintentionally adjusting.

  • Safe ignition

It requires safe electronic ignition system, you need to plug it into standard 110 v electrical outlet with UL-listed cord.

Pros:

  1. Energy efficient
  2. Horizontal stainless steel vent kit
  3. Safe electronic ignition system
  4. Automatic temperature control
  5. Sleek modern design
  6. Easy operation

Cons:

It needs to be plugged in


Features Of Indoor Tankless Water Heater

1. Long service life

The using life of indoor tankless water heater is quite long, installed inside the home. the heating machine is not affected by bad weathers, such as wind, rain or long term erosion by complicated outdoor weathers. Thus the service life of indoor tankless water heater reaches as long as 10-15 years, some even reaches 20 years.

2. Various specifications

For indoor tankless water heater, the specifications and types are various, giving your more options and choices. Large flow rate indoor tankless water heaters such as whole house tankless water heaters can be used for large family, and portable type can be used for small tiny home. Different specifications will meet different demands of yours.

3. Flexible installation spots

The installation spots of indoor tankless water heater can be quite flexible, you can either install it on point of use, or in the bathroom for shower use. If you do not have much space in bathroom, you can also install it somewhere convenient in the kitchen.

4. Large flow rate

Not all the indoor tankless water heater have large flow rate, for some point of use tankless water heaters, flow rate can be so low as 2 gpm. But as most of them are used for supporting multiple bathrooms the same time, flow rate of indoor tankless water heaters are normally large.

best residential tankless water heater
best tankless water heater residential

Types Of Indoor Tankless Water Heaters

According to the using applications, indoor tankless water heaters can be divided into whole house type and point of use type.

Whole house tankless water heater needs to support multiple bathrooms or faucets use, thus the flow rate and power are both large, reaching 9 gpm even. It can also be used as commercial tankless water heater. We have made detailed whole house tankless water heaters reviews for you, you can check out for more information.

Point of use tankless water heater is quite small and compact in shape, some of which are small enough to be installed right under kitchen sink. Flow rate is normally small, reaching around 3 gpm. Of course some large flow rate types can also be used for point of use tankless water heaters, you just need to install near the application fixture and the waiting time can be shortened to large extent. For more information on point of use types, please have a look at our best point of use tankless water heater reviews.

Based on energy power source, they can be divided into natural gas tankless water heater, propane tankless water heater as well as electric tankless water heater.

Which Is Best, Propane, Gas Or Electric Tankless Water Heater?

As for indoor tankless water heaters, both natural gas and propane types need to install ventilation facilities along with the heating machine to let out wasted gas, but not for electric one.
Indoor propane tankless water heater is quite a clean machine, it does little harm to environment. The power and flow rate of it is a bit higher than electric one.

Tankless gas indoor water heater, however, can sometimes adopt propane as major power too. The power is normally large and can be used as whole house tankless water heater. Using costs of gas types are much cheaper.

Electric tankless water heater is quite flexibility on its installation spots, it can be installed anywhere you want because no ventilation facilities are required. But the using costs of it is relatively high.

There is no absolutely best indoor tankless water heaters, because the size of families, budgets, home locations, applications and also daily water use are different for each family. Each of the three types tankless water heaters have their own advantages and shortcomings, before selecting, you need to take all the factors into consideration. If you have trouble in choosing, or want to know more information of each type, please check out more on Amazon or on our reviews we made for you.

residential tankless water heater reviews
indoor tankless water heater reviews

The Best Tankless Water Heaters

Indoor Tankless Water Heater vs. Outdoor

Indoor tankless water heater is installed at home, either on the wall of bathroom or kitchen, so it is hardly affected by weathers. However, outdoor tankless water heaters need to stay outside after installation, it needs enclosure to prevent the machine from being corroded by rain or sunshine for long time. Even with the protection cover, it is affected to large extent. Therefore, compared with indoor tankless water heaters, the service life of outdoor type can be a bit shorter.

Indoor tankless water heater installation can be more flexible than outdoor types, for outdoor tankless water heater, it needs to be installed right outside the bathroom wall for short waiting time of hot water. But as for indoor types, you can install wherever is convenient.

The other difference between indoor tankless water heater and outdoor type is ventilation. Both natural gas and propane tankless hot water heaters need ventilation facilities to let out gas for safety when installed indoor. However, if you get it hooked outside, no ventilation is needed and much money is saved on it.

Indoor Tankless Water Heater Price

Price levels of each types of indoor tankless water heaters are different, it depends on the applications, flow rate and power of machine. Normally the whole house types are more expensive than point of use types. And price of gas, propane and electric tankless water heaters are also different to large extent.

Apart from heating machine price, you should also regard using costs as important factor. To some of the water heaters, the using costs are even expensive than purchasing price. It is influenced by energy efficient and waiting time of the machine. Besides, the installation and maintenance costs are also a large sum of money.

Only after integrating the two elements of costs together can you choose the most suitable and cost effective one. If you want to know more details about best indoor tankless water heaters on the market, you can check it out on Amazon freely.

tankless gas indoor water heater
tankless water heater gas indoor

FAQ:

1. Can indoor tankless water heater be installed outdoor?

It depends, if there is clear remark on the products for outdoor installation, then you can hook it up outside. Or it needs to be installed indoor only. You can ask the manufacturer for sure before and after buying.

2. Do all the indoor tankless water heaters need ventilation facilities?

No, only natural gas and propane tankless hot water heaters need to install venting kits, electric tankless water heater does not need.

Summary

Indoor tankless water heaters have many types and applications, all above top 9 best indoor tankless water heaters we recommended for you have their own advantages and shortcomings, you can choose according to your basic needs and budget.

To sum up, we picked out top 3 best indoor tankless water heaters for different needs as follow:

Tankless Water Heater Best Type
Rinnai RUC98iN Tankless Water Heater Best whole house type
Rinnai V65IN 6.6 GPM Tankless Water Heater Best one for middle size home use
Stiebel Eltron Tempra Plus 24 kW Tankless Water Heater Best electric type

If you have interest in the item and would like to get more information on the products, please check out freely on Amazon. There will always be large discount on Amazon, so you can save large sum of money in purchasing. If you still have any other problem in selecting best suitable one, you can just contact us for more.