indoor tankless water heater

Tankless water heater: difference between indoor and outdoor

There are many things to consider if you plan to purchase a tankless water heater. As great of an investment as the tankless water heater is, the pros and cons of owning it go side by side.

When choosing a tankless water heater, consider whether you’re interested in a tankless gas heater or a tankless electric heater. The benefits of owning either differs from compact to energy-efficient.

To help you determine which would be the best choice for you, we’re giving essential breakdowns of both indoor and outdoor tankless water heaters.


If you’re living in a climate that regularly experiences below-freezing temperatures, the indoor tankless water heater might be your best option! With an indoor tankless water heater, you won’t have to worry about weather damage. Besides, your heater will keep the showers and taps piping hot all winter long.

Important points to consider while installing an indoor tankless heater:

Do you have spare space to mount a tankless water heater?

Installing it inside will require some space to keep it intact and valuable for you. While indoor mounting is a question frequently asked, the main part is that you’ve to consider your house and spare space before making this decision.

Is your home newly constructed, or is it an old structure?

If your home is freshly built, consider installing an indoor unit because it will be included in the map you structured for your home building. The space will be identified, and the steps will be taken early for piping and ventilation for your unit. In contrast, the process might be complex with the old house.


If mounted outside, the units of tankless heater should vent unrestricted airflow. But with installing inside of the home, you must use some ventilation piping, be it vertical or horizontal. A tankless water heater requires professional or specialized venting.

If you choose to go with an outdoor unit, consider these factors before deciding.

Do you have a small house, or do you lack space?

If you don’t have a room inside your house, installing it outside will save you some space. An outdoor installation is the best option for those having limited space.

What is the drainage system of your house?

If you have a sound drainage system, the outdoor installation is the best option for you. An outdoor unit will thrive in a proper drainage system with build-up condensation.

What is the piping at your home like?

For some homeowners, having to re-pipe your entire house isn’t financially possible or feasible. In that case, installing an outdoor will be a convenient option for you.

In Summary:

As a reminder, water heaters are sensitive. If installed incorrectly, it can cause significant damage to the unit and potentially to your home. It is important that professionals install the heater. Make sure to get guidance from a professional plumber to avoid any issues down the line.

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