Many tankless water heaters require indoor installation; they are more convenient in using and have a long service life. As a result of their high demand, there are many brands, types and comparison of indoor tankless water heater vs outdoor online.
To help you pick the most suitable one. We compiled a detailed best indoor tankless water heater reviews for you.
Table of Contents
Best Tankless water heater for Indoors
To sum up, we picked out the top 3 best indoor tankless water heaters for different needs as follow:
| Tankless Water Heater | Best Type |
| Best whole house type | Rinnai RUC98iN Tankless Water Heater |
| Best one for middle size home use | Rinnai V65IN 6.6 GPM Tankless Water Heater |
| Best electric type | Stiebel Eltron Tempra Plus 24 kW Tankless Water Heater |
Top 8 Best Indoor Tankless Water Heaters on the Market
To kick off this Best Indoor Tankless Water Heaters Reviews article today, we shall first examine the many different types and the many indoor tankless water heater brands out there on the market. So, you can choose the best one that meets your needs, we have made detailed reviews for you as follow:
This is a top rated residential tankless water heater on the market.
Feature:
- 9.8 GPM flow rate
With a good flow rate that reaches up to 9.8 gallons, it is able to provide support for ¾ bathrooms use simultaneously. The high flow rate of this unit also allows it supply constant hot water for you. It takes only 2 seconds for the water to heat up in the device.
- Dual venting options
It offers 2 venting options, one is a twin-pipe and the other is concentric PVC, so you can pick whichever is simple to be installed. The temperature of each can go as high as 185 degrees F, making it possible for commercial use with the commercial remote.
- Energy efficient
It needs power between the range from 15200 to 199000 BTU per hour, the higher power requirements are, more powerful as it is. The energy-efficient rating maximum is 0.95. But only 2 watts is needed to keep the machine up and running.
Pros:
- Silent working performance
- Dual venting options
- Highly energy sufficient
- Limitless water
- 5 years warranty on the part
- Many showers and faucets use simultaneously
Cons:
Installation needs to be carried out by a professional. So, that is an additional cost.
Perhaps, the best tankless water heater for a house, this unit is worth every penny spent.
Features:
- Low NOx design
This unit meets Texas NOx Emissions and California Standards, highest BTU is 150000, and maximum energy factor is 0.82. Being a natural gas indoor tankless water heater, it has proven to be energy efficient.
- 6.6 GPM
This unit flow rate is only 6.6 gallons per minute; it can take on two showers use the same time in warm areas. It supports frequent hot water for you.
- Special venting
One thing you should be aware of is that it needs special venting and has to be placed near an outside wall for venting plus requires the aluminium interior vent pipe with PVC outer pipe.
Pros:
- Has a compact and lightweight design
- It is quiet while working
- One button for One button turns on and off for vacation
- Frequent hot water supply
- 10-year warranty for heating exchanger
- Installation is simple
Cons:
Requires special venting
Another home tankless water heater natural gas user.
Features:
- 5 gallons per minute of water flow
The unit is able to provide around 5 gallons of water per minute, which is a high flow rate machine. It is able to raise the water by 54 degrees F at 3 GPM. It has in-built advanced flow control to regulate water pressure by itself.
- Stable temperature
It’s flow control system is advanced to controlling water temperature in various flow levels is a walk in a a park. It is perfect for people who need occasional hot water. It has high-level electronic parts and a reliable cover to promise long service life of it.
- Energy efficient
Stiebel is armed with that energy rating reaching up to 99% and complete power modifications enabling large power of the machine. Plus, it adopts self-modulating technology to store up more energy.
Pros:
- It adapts high technology
- Its compact design makes it perfect for small studio use
- Quiet working condition
- Ideal in places where supplied water is under 45 degrees F
- Full power modulation
Cons:
Installation is hard as it need 240v power and heavy-duty wiring
Being one of the best tankless water heater home use, this device will beat your imagination.
Features:
- 3.6 GPM
The flow rate of this unit reaches 3.5 gallons each minute, and it is more than capable of handling a single shower. It can do one shower and one low power consuming kitchen faucet at the same time. It is said to be of high capacity, but really, it is ideal in a studio family use.
- Digital temperature control
Temperature are displayed on the screen of the unit, and 2 buttons are there to adjust water temperature; in fact, one is for gas settings and the other for flow rate. But it is quite hard to adjust to get the exact temperature you want.
This is top in our list of best gas fired instantaneous water heater on the market.
- Stylish compact shape
It is designed to compact and light, taking up only a small piece of land of your home. It uses safe electronic ignition system, you can plug it into standard 120v electrical outlet with UL-listed cord.
Pros:
- Digital control of temperature
- Saves energy
- Delivers hot water in a couple of seconds
- Perfect fit for small house use
- Efficient power ventilation
- Manual water temperature control
Cons:
Difficult to get the temperature you want exactly
This sits on #5 of our best residential tankless water heater reviews. If you haven’t gotten any so far, I recommend you buy this.
Features:
- 150 degrees F temperature
The highest temperature of this unit goes as high as 150 degrees, and it perfectly meets the demand for residential use. It requires little minimal maintenance during the whole using process.
- 6.6 GPM flow rate
The flow rate of the unit goes as high as 6.6 gallons per minute; it provides frequent hot water no matter the season or climate. But in the cooler region, the flow rate may drop to 3-5 GPM.
- Light compact size
It is the smallest and lightest unit amongst all series of Takagi products, it can be easily installed 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:
- Its weight is light
- Installation is simple
- Requires little maintenance
- Many bathroom use available
- Digital remote enabled
- Light-weighted
- Easy to be installed
Cons:
The working noise can be heard
Enjoying this indoor tankless water heater reviews? Keep reading…
Features:
- 185 degrees F temperature
The highest temperature of this unit goes as far 185 degrees F, able to meet the demand of both commercial and residential use. But the waiting time of the hot water may be a bit long, takes around 1 minute.
- 10 GPM large flow rate
This unit offers 10 gallons per minute of water flow, the big flow rate provides you with frequent hot water. It requires 199000 BTU per hour to perform in the best way possible, which is a highly powerful indoor tankless water heater natural gas device.
- Set up simply
Setting up this device is easy, simple add many gas line. Venting facilities are required for venting gas to outdoor. It shape is compact and weight is light, plus, it can be installed anyplace you want.
Pros:
- It is powerful enough for you to enjoy
- Has a high temperature range
- Compact shaped and weight is light
- Large water flow
- Remote control available with a controller
- High-temperature range
- Commercial & residential use
Cons:
Needs to be installed by professionals
The top rated indoor tankless water heater is one of the best indoor propane tankless water heater out there.
Features:
- ComfortFlow technology equipped
This unit is said to be a high technological tankless water heater, it has built-in hot buffer tank and recirculation pump, to eliminate cold water sandwich and save water bills by bringing down the waiting time for hot water.
- Stable water temperature
The temperature of this unit is stable when used; the internal technology allows it to correct the temperature in flash speed once it drops suddenly. The external interface display error codes and temperature. You can turn off the machine with ease by clicking the button.
- Condensing technology
The condensing technology of it recovers the unused extra heat to reduce carbon dioxide emissions AND energy consumption. It keeps exhausted temperature low, it provides up to 0.97 UEF, which is a highly energy-efficient type.
Pros:
- Huge water flow rate
- Manual and installation are simple to understand
- Recirculation pump and hot buffer tank are built in
- Short waiting time for hot water.
- Intelligent preheating technology
- Easy operated
- Powerful
Cons:
Slight working noise can be heard when in use
Being one of the best home tankless water heater to try. We think you’d like this one!
Features:
- Digital temperature control
The digital temperature control allows you to set water temperature in increments of 1 degree. The error codes and temperature shows on the screen. Operation is simple and the settings make it simple to adjust the temperature accurately.
- Advanced ThermoPro technology
It is armed with advanced Atmor’s ThermoPro self-modulating system; it regulates the amount of energy needed to heat the water. And it is also 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
The temperature range of the unit falls can go from 90 degrees to 135 degrees F, and has proven to save about 50% electricity bill each month. Durable stainless steel interior and corrosion resistance performance allow for high heat efficiency and longer life expectancy.
Pros:
- Small footprint
- Saves you 50% on electricity bill
- Set temperature in increment if 1 degree
- Durable stainless steel interior
- Self-modulating system regulates the amount of energy required to heat water
- Automatically detect water flow
Cons:
Need to install a pressure relief device, and you should buy it from manufacturer
This is the last on our list of the best indoor tankless water heater
Features:
- 3 GPM flow rate
The flow rate of this unit is 3 GPM and is only activated when hot water is required, no pilot light is required and only little energy is consumed. It is said to be useful as a whole home tank, supporting 2 things the same time, but we still recommend it for a tiny or small home.
- Modern design
Its design is sleek and speaks of modernity in mind. The easy operated LED display control allows it to adjust water temperature easily. Black tempered glass front panel is set to display temperature, child lock technology to prevent unintentional adjusting/use, and temperature controls with energy-saving mode.
- Safe ignition
It needs a safe electronic ignition system. Plus, you also need to plug it into standard 110 v electrical outlet with UL-listed cord.
Pros:
- Operation is simple
- Horizontal stainless steel vent kit
- Energy is efficient
- Safe electronic ignition system
- Automatic temperature control
- Sleek modern design
- Operation is easy
Cons:
It needs to be plugged in
Features of Indoor Tankless Water Heater
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Long service life
The life service of indoor tankless water heaters are quite long, and are installed outside the home. The heating machine is not affected by bad weathers, such as rain, wind or long term erosion by harsh outdoor weathers. So,. The service life of indoor tankless water heater machines reaches 10-15 years, some even enter 20 years.
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Various specifications
The specifications and types are many and this provides you more options/choices of indoor tankless water heater.
The large flow rate indoor tankless water heaters such as portable type can be used for a small tiny home and whole-house tankless water heaters can be used for a large family. Different specifications will meet the different demands of yours.
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Flexible installation spots
The installation spots of indoor tankless water heater can be quite flexible, you can either install in the bathroom for shower use or on point of use. If you do not have much space in the bathroom, you can also install it somewhere convenient in the kitchen.
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Large flow rate
Not all indoor tankless water heaters have a large flow rate, for some supporting multiple bathrooms at the same time, the flow rate of indoor tankless water heaters are typically large but for point of use tankless water heaters, the flow rate can be so low as 2 GPM.
And with this, we come to the end of the best tankless water heater residential
Types of Indoor Tankless Water Heaters
According to application usage, 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 faucets or bathrooms use, so the flow rate and power are both large, reaching 9 GPM even. It can also function as a 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 heaters are quite compact in shape and small in size, some of which are tiny enough to be installed right under the kitchen sink. Flow rate is typically 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 a 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 the energy power source, they can be divided into the natural gas tankless water heater, propane tankless water heater as well as the electric tankless water heater.
Which Is Best Indoor Water Heater Electric, Propane, or Gas Unit?
As far as indoor tankless water heaters go, both propane and natural gas types require ventilation facilities to be installed along with the heating machine to let out wasted gas, but not for an electric one.
Indoor propane tankless water heaters are clean machines. They do little harm to the environment and the flow rate and power is a bit higher than the 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.
The electric tankless water hear is quite flexible when it comes to picking installation spots, it can be installed anywhere you desire because no ventilation facilities are required. But the usage cost of it is relatively high.
There are no absolute best indoor tankless water heaters, because the home locations, budgets, size of families, applications and the use of daily water vary for each family. Each of the 3 types of tankless water heaters for indoor has its own pro’s and con’s, before buying, you need to take all factors into consideration. If you have trouble in selecting, or want to know more information on each type, please check out its pros and cons, before picking, you should take all factors into consideration.
If you have issues in choosing, or want to know more information on each type, please check out more on Amazon or on our reviews we made for you.
Perhaps, our indoor tankless water heater reviews has answered your question: What is the best gas fired instantaneous water heater?
The Best Tankless Water Heaters
- 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
Indoor Tankless Water Heater vs. Outdoor
In recent years, there have been a battle between these two gas types, with more people searching for comparison and Indoor Tankless Water Heater vs. Outdoor guides. Well, count yourself fortunate to be at the right place.
The indoor tankless water heater is installed inside your home, either on the wall of the kitchen or bathroom, so weather hardly affects it. But, outdoor tankless water heaters need to be installed outside as it requires an enclosure to prevent the machine from being corroded by sunshine or rain for long periods. Even with the protection cover, it is affected to a large extent. So, compared with indoor tankless water heaters, the service life of outdoor type can be a bit shorter.
Indoor tankless water heater installation can prove to 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.
Another difference between the indoor tankless water heater and outside type is ventilation. Both propane and natural gas indoor tankless water heaters require ventilation facilities to let out gas for safety when doing indoor installation. But, if you need it hooked outside, no ventilation is required and much money is saved on it.
Indoor Tankless Water Heater Price
Price levels differ in indoor tankless water heaters. The power, flow rate, and the applications of the machine determine its price. Generally, the whole house types are more costly than the point of use types. And the price of propane, gas, and electric tankless water heaters are also different to a large extent.
Aside heating machine price, you should regard using costs as an important factor. To some of the water heaters out there, the using costs are even more expensive than the buying price. It is influenced by waiting time and energy-efficient of the machine. Aside this, the maintenance and installation costs are also a large sum of money.
It is only when you’re integrating the 2 elements of costs together that you can choose the most suitable and cost-effective one. If you want to know more details about the best indoor tankless water heaters on the market, you can check it out on Amazon freely.
The best tankless water heater gas indoor for you waits on Amazon marketplace.
FAQ:
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Can indoor tankless water heater be installed outdoor?
It depends. It’s best to flow instruction son the item. If its recommended for outdoor installation, then you can hook it up outside.
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Do all the indoor tankless water heaters need ventilation facilities?
No, only propane and natural gas tankless hot water heaters require installation of venting kits. The electric tankless water heater do not need this.
Summary
The indoor tankless water heaters have a lot of applications and types, all the listed top 9 best indoor tankless water heaters for gas, natural gas, electric and propane recommended for you have their own pros and cons,. You can select according to your budget and basic needs.
If you are interested in any item and would like to get more information on the products, please check out freely on Amazon. Amazon offers discounts and products at amazing discounts, so you can save a large sum of money in buying. If you still have any other problem in choosing the best suitable one, you can just contact us for more.
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