The Best Direct Vent Tankless Water Heater Reviews 2020!

When using tankless water heaters, venting serves as the most significant factor. Improper venting techniques can really result in gas leakage or even cause a fire. The power vent tankless water heater, direct vent tankless water heater, and also atmospheric are three common types of venting types available in the market.

What’s the disparity between these types? Which exactly one ought to you select? Which is much safer to utilize? Through this post, we’ll provide you all the basic information about venting a tankless water heating system. Also, we have chosen a few of the best direct vent types and created the direct vent tankless water heater reviews, which you can read and choose the suitable one for you.

Basics Of The Water Heater Venting:

Any water heating units that burn propane or natural gas need some kind of venting system. It makes use of ducts and pipes, or in simple words, a chimney, for getting rid of all the moisture, exhaust gas, and heat from your house, making a safe and secure environment for the outdoor propane or natural gas usage. In terms of venting, the common word anyone will hear is combustion. Combustion can refer to the procedure of burning gas.

The major reason for the vent duct is to get rid of the heat or exhaust gas. All of this can be created by plastic or metal, relying on the venting system you are making use of. For a few ducts, they go directly outdoors. Or they might tie to some other bigger vent systems, recognized as the common vent configuration.

Top Direct Vent Tankless Water Heater Reviews:

 2. Rheem RTGH-84DVLN Indoor Direct Vent Tankless Water Heater:

Rheem RTGH-84DVLN 2020

This tankless water heating unit is a very powerful machine with a max water flow rate that can simply reach up to 8.4 GPM. What if you require an even larger water flow rate type? The EZ-lint cable of this tankless water heater has made it pretty simple; you can easily connect two water heating units as one with your system. Thanks to the safe self-diagnostic system this device has, all the error code shows both in use and in installation.

The freeze protection system has also made accessible in all the severe weather conditions for use and installation. According to the consumers, this tankless water heater is able to supply constant hot water for three bathrooms. The water flow required for the firing up machine is also low enough, which denotes that you don’t require opening up the tap long time for the heated water.


  • Three bathrooms accessible
  • Constant hot water
  • Low using costs
  • Fast supply of hot water


  • A little noise can be heard in using
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2. Rheem RTGH-95DVLN Indoor Direct Vent Tankless Water Heater:

Rheem RTGH-95DVLN Indoor Direct Vent Tankless Water Heater

This natural gas tankless water heater comes with a large water flow rate. It provides 9.5 gallons per minutes of water flow rate in using. The best performance of Rheem devices is also inherited. This particular unit can supply hot water consistently for you. With the remote control panel that it comes with, you’re capable of adjusting the water temp simply. The error code shows on the temp display screen.

It also comes with direct vent two pipes system; one pipe is for the intake, while the other one for exhausting the heat or gas. If you are going to use this unit as the commercial tankless water heater, this device can be manifolded up to 6 units with the optional. While installing this unit, the self-diagnostic system can be quite helpful.


  • Easy to utilize
  • Pretty quick and quiet in supplying hot water
  • The constant supply of hot water
  • Simple to adjust water temp


  • Max temp raises up to 120 degrees Celsius only
  • Coldwater sandwich
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Proper Venting Decreases Backdrafting:

What’s Backdrafting?

It is a common issue in the usage of propane or gas tankless water heater. Backdrafting can refer to a situation that exhausted heat or gas fail to leave the house through the vent or pipe. When the oxygen is re-introduced, it becomes a possible danger to firefighters. Certainly, the reasons for backdraft differ in diverse applications and using places, but one common reason is the improper technique of venting.

Different Venting Types Explained:

Based on the diverse heating system, there’re three common venting types available in the market that are usually adopted, which comprises the direct venting, the atmospheric venting, and the power venting.

  • The Power Vent:

The power venting system makes use of the fan or blower for exhausting the gas. You can install it on top of your machine and can have either vertical or horizontal duct. It needs the electric outlet near your water heating unit for supplying the power for its fan. The major benefit is for the free installation for it needs no chimney, by running an economical pipe, the exhausted gas can easily be vented out directly.

What comes with this type of venting is the high cost on the portion on fan or blower and the electric power. Besides, there’ll always be a little noise in working the fan or blower, through proper installation, you can minimize that noise to a great extent. Certainly, to the majority of your family, that noise can be ignored, but it’s a factor that you ought to be aware of before purchasing.

  • The Atmospheric Vent:

It’s the most standard and common venting technique, an upward-sloping or vertical vent can tie into an ordinary vent, because of the temp disparity between hot air and cold air, upper hot air can flow out from the pipe. This venting type is regarded as the cheapest one on buying and also the easiest on installation. It can really work flawlessly when under the correct installation, or it comes with the potential backdraft danger.

  • The Direct Vent:

The direct vent tankless water heaters need no extra power. The exhaust gas is vented out vertically through the separate vent duct. Thus the venting costs and the using costs are very low. For the majority of direct vent units, two pipes are utilized. One pipe is for the intaking purpose while the other one is for exhaust. But a lot of companies now only adopt concentric vents. Since it can directly get in touch with the outdoor air, risk on the accidental fires is decreased largely.

Direct Vent Vs. Non-Direct Vent:

Direct Vent Vs. Non-Direct Vent

Direct Vent:

  • Needs no fan system
  • Can be vented either horizontally or vertically
  • Directly breathe with the outdoor air

Non-direct Vent:

  • Make much noise while working
  • Makes use of the electric fan for driving the exhaust gas outside
  • Higher price

Benefits Of The Direct Vent Tankless Water Heater:

  • Safe:

The direct vent tankless water heaters make use of a sealed combustion chamber. This chamber can really prevent the oxygen from re-introducing into your system and thus directs to the less risk on the accidental fires while using it.

  • Free Of Chimney:

Unlike the power vent or non-direct vent tankless water heaters, the direct vent tankless water heaters need no chimney, and it has no electricity for pushing out the exhaust heat or gas. Therefore, you can make use of it even when you don’t have a chimney system in your house.

  • Wide Application:

For a few of the best direct vent systems, you can really install them near your outside wall. You can commonly find them in both tankless types and tank types.

  • Low Cost:

No blower or chimney is needed in exhausting the gas, and no electricity ordered to power the venting system.


Both best power vent tankless water heaters and best direct energy tankless water heaters can provide you with the best and most pleasing user experience when they are correctly installed. As for which one is the best method of venting the tankless water heater, it depends, either on the using places or on the applications.

In brief, the direct vent systems are quite recommendable to the people who don’t have any chimney in their houses. It needs less electricity, particularly in the venting, and is safer and secure compared to the non-direct tankless water heating machines. If you want to know more about the best direct vent tankless water heating systems available in the market, you can check out Amazon as you can get thorough product specifications on Amazon.