5+ Best Indoor Gas Tankless Water Heater Reviews And Buying Guides 2020!

There’re in a total of two ways of installing the water heaters, one is the indoor installation, and the other one is the outdoor installation. The indoor installation is the most commonly used way and is often adopted for residential use. In this article, you will be provided with the top 6 indoor gas tankless water heater reviews and also with a guide that will help you in purchasing the most suitable one for you.

So, let’s get started!

Best Indoor Gas Tankless Water Heaters Reviews:

There’re a lot of indoor gas tankless water heaters types available in the market. According to the use, you can divide them into commercial use, residential use, whole-house types, and point of use type. We’ve done reviews for all of them here. You can check these reviews if you have any interest. After making a complete comparison, we have finally chosen a few following models and made the top indoor gas tankless water heaters reviews so that your time can be saved.

1. Noritz NR981-SV-NG Indoor-Outdoor Tankless Water Heater:

Noritz NR981-SV-NG Indoor-Outdoor

Features:

  • 8 GPM Of Water Flow Rate:

The water flow rate range of this device is 0.5 to 9.8 GPM, which is really a high capacity gas indoor tankless water heating unit. It can really support three bathroom and kitchen faucets in the warm regions and two bathrooms in the cold regions.

  • 100 To 140 Degrees Fahrenheit:

The water temp range of this machine is 100-140 degrees Fahrenheit, ideal for residential use. And there’re nine heating options available that you can go for.

  • Low NOx Design:

It’s created as a low NOx model, so less gas is wasted in the time of using and it’s more energy-efficient as well.

  • 12 Years Of Warranty:

The company promises to keep twelve years of warranty for the heat exchangers. And the outstanding quality allows the users to make use of it for a long time; the copper wall is created based on the commercial-grade; thus, no leakage takes place in use.

Pros:

  • Outdoor and indoor installation accessible both
  • Highly energy efficient
  • Commercial grade copper wall
  • Can be utilized for the high altitude
  • Easy operation

Cons:

  • Waiting time for the heated water is quite long
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2. Navien NPE-180A Premium Condensing Tankless Gas Water Heater:

Navien NPE-180A Tankless water heater

Features:

  • 4 GPM Of Water Flow:

The water flow rate of this indoor gas tankless water heating machine is about 8.4 GPM, ideal for 2 or 3 bathrooms utilized in the warm regions; you can also use kitchen faucets simultaneously.

  • Built-In Buffer Tank & Re-Circulation Pump:

This indoor tankless gas water heating device adopts an elite ComfortFlow re-circulation pump that’s internal and a buffer tank for saving the water and reducing the time to get the heated water. And you don’t have to purchase any extra re-circulation pump.

  • Condensing Efficiency:

The condensing technology is installed for recovering the extra heat that’d be lost in the non-condensing ones; it really assists in reducing the greenhouse gas emissions and energy consumption. And it offers up to 0.99 EF or 0.97 UEF, which is very energy efficient.

Pros:

  • Highly energy efficient
  • High water flow rate
  • Residential and commercial use
  • Cascading Capability
  • Low NOx design

Cons:

  • Waiting time for the heated water is a little long
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3. Rinnai RUC98iN Ultra Series Tankless Water Heater:

Rinnai RUC98iN Ultra Series 2020

Features:

  • Two Venting Design:

For the venting facilities, it provides you with two options. One is a twin-pipe while the other is concentric PVC. You can pick one that fits the house of yours best.

  • 8 GPM Of Water Flow Rate:

Like Noritz tankless indoor gas water heating unit, the water flow rate of this device is also up to 9.8 GPM, which can be utilized ideally for the whole house usage and is the best option for a middle size family or large family use.

  • 95 Thermal Rating:

This device’s thermal rating can really reach as high as 0.95, which is actually a high energy-efficient tankless natural gas water heating unit. It denotes nearly all the natural gas is utilized without waste.

Pros:

  • Quiet working condition
  • Residential and commercial usage both
  • Ideal for the whole-house usage
  • Endless supply of hot water
  • Smart digital control panel

Cons:

  • Have to get a professional for installing this system.
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4. Takagi T-K4-IN-NG Indoor Tankless Natural Gas Water Heater:

Takagi T-K4-IN-NG

Features:

  • 99 To 167 Degrees Fahrenheit:

The water temp range of this machine is between 99-140 degrees Fahrenheit that can really suit the requirement for the residential and even commercial usage perfectly. But there’re just four accessible temp settings. With your remote control, the max temp can reach even more than 167 degrees Fahrenheit.

  • 8 Gallons Per Minute Of Water Flow Rate:

Compared with the majority of suggested gas indoor tankless water heating machines above, this device has a comparatively low water flow rate, reaching just eight GPM, but it’s still capable of supporting several bathrooms, and kitchen faucets use at the same time.

  • Self-Diagnostic System:

With this system, the water heating unit is capable of protecting itself. When it reaches way too much heat, a light shows off, and the water heater automatically stops working.

Pros:

  • Both outdoor and indoor installation
  • Large power consumption
  • Remote water temp control
  • Smart internal freeze protection
  • Commercial usage accessible

Cons:

  • You have to purchase an additional remote controller for using the remote control system
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5. Eccotemp FVI-12 Natural Gas Tankless Water Heater:

Eccotemp FVI-12

Features:

  • Fast Heating Time:

As the tankless natural gas water heater, the heating time of it is pretty fast. It takes just about five seconds for the heated water to flow, which can really save much cold water and also help you in saving on the water bills.

  • 6 GPM Of Water Flow Rate:

This device is a small water flow rate of gas indoor tankless water heating device; it’s ideal for the small or tiny home-usage. It is capable of supporting one kitchen faucet and one bathroom simultaneously.

  • Simple Operation:

There’re clear and simple operated digital control, the temp of the water shows on for you to easily adjust. And two buttons are available for simply adjusting both water temps and gas.

Pros:

  • Ideal for small or tiny house usage
  • Simple installation
  • Simple to operate
  • Short waiting time for the heated water
  • Compact shape

Cons:

  • Difficult to get the water temp accurately that you desire.
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6. Navien NPE-240S-NG Premium Condensing Tankless Gas Water Heater:

Navien NPE-240S-NG

Features:

  • 96 Thermal Efficient:

The energy efficiency of this system can reach 0.96, and the max input is 199900 British Thermal Units per hour. It can also assist in saving a huge amount of cash on the heating bills for you.

  • 2 GPM Of Water Flow Rate:

Among all the suggested best tankless gas water heating units for residential use, this one is the largest one on the water flow rate. It’s able to support four bathrooms and several kitchen faucets simultaneously. And you can also make use of it as a commercial tankless water heater.

  • Preheating System:

As one of the modern tankless water heating devices, it is created with the preheating technology, it can preheat the water smartly for you if you make use of the heated water in regular time every day, and the heated water maintains for a long time.

Pros:

  • Endless supply of hot water
  • Ultra condensing efficiency
  • Smart design
  • Digital control panel
  • High energy efficient

Cons:

  • A little large in size as compared to the other types.
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All the indoor gas tankless water heaters mentioned above provide the best working performance. You can easily and freely check their prices on Amazon if you are really interested in any one of these devices.

Tankless Water Heater Gas Indoor Features:

Tankless Water Heater Gas Indoor Features

The indoor tankless water heating systems provide the following features:

  1. Simple Installation:

For the indoor gas tankless water heating machine, the fitting is quite simpler than the outdoor type. Thanks to the easy design of the majority of tankless water heaters, you can even install a few of them all by yourself, and it takes just about two hours to hook them up.

  1. Short Waiting Time:

According to the principle of working of the gas tankless water heating device, the heated water requires to flow through a pipe, and then you can make use of it for taking a shower or washing dished in your kitchen. If you fir the natural gas tankless water heating unit outdoor, then it takes much longer for the heated water to flow to its required destinations. Thus the waiting time is prolonged, and it demotes more cold water is wasted; the water bill will then be increased accordingly.

  1. Long Using Time:

When you fit a tankless water heating machine outdoor, it’s simply broken with the rain or wind unless you append the particular protection cover on the device. However, the indoor gas water heater absolutely diminishes the matter; the unit will not be rotten by the severe weather conditions. Thus the using time can be extended than the outdoor gas tankless water heaters.

How Can You Select The Best Indoor Gas Tankless Water Heater:

The gas tankless water heater can really adopt natural gas as the main source of power; therefore, there has to be the venting facility for safety. Not just for venting, but there’re also a lot of other things you have to contemplate in selecting and purchasing the best indoor gas tankless water heating unit, here we will give you some tips on choosing:

  1. Installation Place:

A few of the indoor gas tankless water heating units are a point of use types, while the others might be the whole house types. Before purchasing one, you have to make certain where you want to fit the device, and if you desire to get a whole-house gas tankless water heating device, or just desire to fit a small one for your kitchen sink usage.

  1. Venting:

As we’ve already said that the venting facilities are the most significant thing you have to contemplate. For a few indoor gas tankless water heating machines, the venting technique is special and has to be bought along with your device. Besides, the majority of residential ½ inch PVC pipe might not be appropriate for the venting facilities, and they might need ¾ inch ones. For decreasing the installation and using charges as much as possible, you ought to clearly ask the company about the venting needs before purchasing their product.

  1. Water Flow Rate:

The water flow rate of each gas indoor tankless water heating system can vary a lot, ranging from three gallons per minute to perhaps thirteen gallons per minute. Mostly for the residential tankless water heating systems, the water flow rate from six to nine GPM can well suit several bathrooms usage. So thinking about the actual water flow rate you require before purchasing and select the most appropriate one.

  1. Size:

Though compared with the tank water heating units, the gas indoor tankless water heater is much smaller in size. But their size still varies a lot. If you desire a whole-house gas tankless water heater, you might require a large size model. And just for the kitchen faucet, point of use and portable tankless water heater might be more suitable.

Top 3 Indoor Gas Tankless Water Heating Systems:

Conclusion:

If you still face problems while selecting the best indoor gas tankless water heater that best suits your requirements or desire to know a little bit more about a particular product, then feel free to check on Amazon directly.