8 Best Indoor Propane Tankless Water Heater Reviews, 2021 Update

The best indoor propane tankless water heater provides more convenient service and has an excellent service life. When looking for the best indoor propane tankless water heater, you have to understand that are many types and brands on the market. You should note that a propane water heater is an ideal option for providing hot water and also saving energy. They provide hot water for immediate usage rather than storing hot water in a tank, leaving it to lose energy away.

In this article, we will give the top 8 best indoor propane tankless water heater reviews as well as buying guides for your needs.

What Is the Best Indoor Propane Tankless Water Heater?

Best Indoor Propane Tankless Water Heater Comparison Charts

Photo Title Price Buy
Rinnai V65iP Tankless...image Rinnai V65iP Tankless Hot Water Heater, 6.5 GPM, Propane, Indoor Installation Check Latest Price
MAREY GA10LP Power...image Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater Check Latest Price
Rinnai RL94iP Tankless...image Rinnai RL94iP Tankless Hot Water Heater, 9.8 GPM, Propane, Indoor Installation $1,309.81 Check Latest Price
Rinnai RU199iN Condensing...image Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation $1,199.99 Check Latest Price
Excel Pro Tankless...image Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Check Latest Price
Rinnai RUR98iP 9.8...image Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater Check Latest Price
Rheem Mid-Efficiency 8.4...image Rheem Mid-Efficiency 8.4 GPM Outdoor Liquid Propane Tankless Water Heater $953.00 Check Latest Price

Can You Run a Tankless Water Heater on Propane?

You should note that there are two major types of tankless water heaters. They are electric and gas models. The gas unit can either burn propane or natural gas. Despite the type of fuel, propane or natural gas units operate in the same way. In fact, a lot of manufacturers offer both propane and natural gas models.

Reviews of Best Indoor Propane Tankless Water Heater

#1. Rinnai V Series HE Propane Tankless Water Heater

best indoor propane tankless water heaters



The Rinnai V Series HE is an indoor-mount tankless water heater that is designed to efficiently deliver 6.6 GPM of hot water. That makes it ideal for a home with two or three bathrooms. You will find this unit easy to install and an ultra-compact unit that allows you to enjoy the benefits of tankless water heating. In fact, you can experience clean hot water at your preferred pre-set temperature. Moreover, you can save floor space and energy in your home.

Ideally, the Rinnai V Series HE is an ideal combination of comfort, value, and high-efficiency in propane gas heaters. It is perfect for small homes.

Top Features:

Endless Hot Water – With this heater, you can put an end to scheduling hot water required in your home. You do not have to choose between taking hot water, running a dishwasher, or doing laundry. That is because this system cannot run out of hot water.

Hot Water On-demand

This propane indoor water heater is fitted with ThermaCirc360 technology that passes hot water through pipes fast. That means you do not have to wait for hot water to get from the old tank to the shower, as the case with tank water heaters.

Save Valuable Space

It does not have to be a struggle to get hot water. In fact, the compact design makes it easy to install in areas such as the attic, closet, or even crawl space. With this unit, you can save about 16 square feet of space.



#2. Marey GA10LP Indoor Outdoor Tankless Water Heaters

the indoor tankless water heater



The Marey GA10LP is designed to save a lot of space and allow for installation indoors. With this unit, you can hit a lot of water as much as you want and allows you to regulate the gas flow and water flow at the pre-set temperature. Therefore, if you want on-demand and instant hot water, this is one of the best indoor propane heaters to consider.

You will also find this heater an ideal alternative for people who experience power outages or live in remote areas without electricity. This water heater is designed to deliver 3.1 GPM. That is a sufficient amount of water that can be used at different points of your home.

Top Features

Easy to Install

If you are going to do this yourself, this is the perfect water heater. In fact, you only need a 2-D cell battery for venting and ignition.

Saves energy

One of the reasons you use a propane heater is to save on energy usage in your home. With the 87-percent efficiency level, you are assured of saving a lot of energy. Moreover, this unit can last a lifetime.



#3. Rinnai RL Series HE Propane Indoor Installation Tankless Water Heater

tankless water heater cold water



The Rinnai RL Series HE allows you to enjoy instant hot water for a maximum of five appliances and plumbing outlets. In fact, you will get water at a pre-set temperature. This unit is designed to deliver 9.4 GPM of hot water. Even then, you will still enjoy at least 40% energy savings. Other things you will like about this propane heaters include recirculation technology and Wi-Fi monitoring.

Top Features

Huge Energy Savings

You should note that Rinnai RL Series HE is designed for both residential and commercial applications thanks to huge energy savings and lots of capacity.

Leak Detection

The unit has enhanced scale detection that reduces the possibility of long-term and serious damage to water heaters. This system is designed to shut off immediately if there is water leakage. In this way, it protects your property.

Temperature Lock

This is an important feature to prevent accidental or unauthorized changes to the required water temperature.



#4. VEVOR Propane Water Heater

best indoor water heaters



VEVOR Propane Water Heater provides hot water without waiting. Being compact means that it saves a lot of space. The truth is that you can get instant, hot water whenever you want it. This water heater helps you achieve heat for the bathroom and the kitchen and avoid the risk of leakage. Ideally, this is a nice unit for a home. It allows you to take a hot shower and even wash your pets. If you experience a lot of power outages or reside in a remote area, this is the perfect unit for you.

Top Features

Easy to Mount

The unit comes with a shower kit. The wall-mount design frees up a lot of space that can be used for storage. You have the option of either mounting or hanging it.

Saves Energy

This tankless water heater allows you to get adequate hot water and save your energy by up to 50%. Unlike traditional tank water heaters that take up a lot of space, the wall-mount design freezes up a lot of floor space. The unit features an advanced self-modulating technology to ensure it converts most of the energy to heat.

Safe for Use

The most important security features include overheating protection and controller design. Also, it has other features, such as anti-freezing protection and water pressure regulation.



#5. RU199in Water Heater

the best propane tankless water heaters



The RU199in Water Heater has the same stats as the top models. This unit is designed to deliver 7.7 GPM at 50 degrees and 5.9 GPM at 70 degrees. The good thing about this unit is that it is 96% efficient and can use both propane or natural gas. However, unlike most of its counterparts, it does not have the reticulation system. Therefore, if you do not want a reticulation system, this is the best unit you can ever get.

Top Features

Energy Efficiency

This is an important metric when it comes to purchasing water heaters. The RU199in Water Heater is synonymous with energy efficiency. Thus, you will enjoy a lot of energy savings as a homeowner.

Wi-Fi Connectivity

You can download the right app and control your tankless water heater. In fact, with this feature, you can troubleshoot problems and check the heater’s performance.



#6. Excel Pro Tankless Gas Water Heater

indoor propane tankless water heater



The Excel Pro Tankless Gas Water Heater is a powerful, yet compact unit that delivers 140,000 BTU per hour. Therefore, the heater can meet hot water needs for an apartment or single-family home. You can mount it on the wall. It can also provide water for domestic appliances and plumbing fixtures. Its LCD display helps you to set the desired water temperature.

Top Features

Modulates Heat Output

The unit is designed to modulate heat output in response to the flow rate of water that runs through the unit.

High Capacity

The unit can deliver 6.6 GPM of hot water that can serve an apartment or single-family homes.

Natural Gas

Other than using propane, the unit can also use natural gas.



#7. Rinnai RUR98iP Series Propane Gas Tankless Water Heater

indoor natural gas heaters



The Rinnai RUR98iP delivers technological and innovation leader when it comes to tankless water heater design. Ideally, homeowners are provided with an endless supply of hot water, energy savings, space-saving design, and environmental benefits. In fact, this unit can deliver faster hot water. With the reticulation feature and thermal bypass technology, you will not have to wait longer for hot water.

Top Features

Reticulation Capability

Whether you have or you do not have a dedicated reticulation line, this technology offers an endless supply of hot water.

Innovative Condensing technology

The unit features the deal heat exchangers to offer maximum efficiency. Also, it has an efficiency of 95%.



#8. Rheem RTG-84XLP-1 Propane Tankless Water Heater

best indoor propane tankless heaters



The Rheem RTG-84XLP-1 belongs to a series of mid-efficiency tankless gas heaters you will find on the market. This unit can deliver 26 GPM. That means it can even receive water in low demand situations. The water heater has met the requirements of safety, thanks to low emissions. The overheat film prevents the units from getting to dangerous temperatures. Some of the important things to consider include notification settings and self-diagnostic system. You should note that this unit is designed for use outdoors. Therefore, there is no need for venting.

Top Features

Wi-Fi Connectivity

You can connect this unit to your Wi-Fi internet and control it through the app.


This unit is known to provide exclusive water-saving technology. In fact, with this unit, you can save up to 1,2000 gallons per year.



Best Indoor Propane Tankless Water Heater Buying Guide

Choosing the right indoor propane tankless water heater can help you save a lot of money. The following are some tips to help you.


You can estimate the temperature in the urban areas and then determine the temperature you require. In fact, most propane heaters can deliver up to 150 degrees F. However, if you are residing in cold areas, the temperature can drop a bit.


Before you choose a propane heater, you have to determine whether you need a small capacity or large capacity. You have to take into account the available space and your budget. If they are not an issue, you can get the whole house heater. On the other hand, if you are planning to get one for camping or traveling, then you should go for a portable heater.

Flow Rate

Various homes will require a varying flow rate. If you have a small home, a water heater that delivers 3 GPM is sufficient. However, if you have a large family with many bathrooms, you should go for at least 9 GPM heater to accommodate multiple uses. It is advisable to estimate the amount of water you use each day and determine the level of flow rate.

Energy Efficiency

If you want to save money, you need to get a high energy-efficient heater. The fact that it uses less gas, it is more environmentally friendly and eco-friendly.


It is important to consider the safety of your propane tankless water heaters. Most heaters are designed to have self-protection systems, such as freeze protection and self-diagnosed device. The systems can protect the device even in dangerous situations and stop it.


One of the major concerns of a propane water heater is the cost. It is vital to purchase something that you can afford. You may also need to consider the warranty. Most propane years have a warranty of 10 to 15 years. Ensure you maintain your water heaters if you want to save water.

Benefits of Propane Tankless Water Heater

indoor propane tankless water heater

Clean Water

When you use a water tank, a given amount of water must remain in the tank for heating. After a long time, the interior part of the tank corrodes, and water you get is not as clean as you will want. Fortunately, with a propane heater, you are bound to get clean hot water for handwashing and bathing.

Instant Hot Water

Another important benefit of propane hot water heaters is the constant supply of hot water. You do not have to worry about running out of hot water. In fact, you can get hot water within a few seconds.

Long Service Life

If you get a high-quality propane water heater, it is bound to last many years. In this way, it will save you a lot of money as you will not be replacing it now and again.

Space Saver

You should note that propane water heaters are smaller and occupy a smaller space than tank water heaters. In fact, you can install it anywhere in your home.


The truth is that getting a propane tankless water heater can save you a lot of money in the long run. That is because these heaters are known to be energy-efficient and provide continuous hot water whenever they are called upon.

Top 3 Best Indoor Propane Tankless Water Heater


Will Montgomery

Will Montgomery: Electro-Mechanical Engineer, Serial Entrepreneur, and Real Estate Enthusiast. Met David at Penn State, where he earned a BS in Electro-Mechanical Engineering and a minor in Business. Expertly manages capital equipment manufacturing, refurbishing, and repair businesses, while exploring opportunities in real estate and advocating for practical heating solutions.

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