Find How Much Propane Does a Tankless Water Heater Use

The water heater does not always keep hot water all day, and some unit types will heat the water by demand. This will include accessing the water directly from the water type.

How much propane does a tankless water heater use? To answer the question, you need to understand the general idea of a water heater.

The tankless water heater, known for its energy-efficient design, uses propane as fuel. Its BTU rating, which measures the unit’s energy output, is critical to its efficiency. Homeowners prefer this model for its cost savings and its ability to provide a consistent amount of hot water without needing a large storage tank.

how much propane does a tankless water heater use

Tankless Propane Water Heater

The tankless water heater is one type of heater that is usually used to reduce costs. It only takes up a small space in your home, so you do not need to prepare a prominent place for the appliances. Nevertheless, it still works as fine as the others.

Hence, let us take some time to understand the general idea of these home appliances. These guides will help you better understand the unit at your home. Here they are:

  • A tankless water heater is an excellent option if you want to use appliances that save some energy. If the typical water heater constantly uses energy to heat water, this one is not. Therefore, you will find your energy usage is relatively low.
  • This water heater is specially made for you who want to start going green. Since it uses less energy than the other type, you will find it more efficient and reduce the waste of energy.
  • The water heater will save you not only energy but also costs. Moreover, since the energy usage is lower than the other, It may also reduce the costs. Hence, you will find your electricity bill to be more manageable.
  • A tankless system on a water heater will eliminate the standby losses on traditional water heater appliances.
  • These appliances will help to lower CO2 emissions by about 50% to 60% compared to the other water heater type.
  • Homeowners will not need to be concerned about the leaking like other types.
  • There is no need to be concerned about carbon monoxide leaking at home since the tankless water heater has a sealed air supply and exhaust vents.

Read also: Water Heater Drain Pan Code

How Much Propane Does a Tankless Water Heater Use?

When estimating the propane consumption of a tankless water heater, several factors come into play, including the frequency of use, the number of users, and the desired water temperature. Additionally, the heater’s efficiency in converting cold water to hot water without unnecessary waste is crucial.

A gallon of propane can produce a significant amount of hot water, depending on the heater’s efficiency and the incoming water temperature.

To do this, you could use some references. For example, here are the references for the number of propane used in a household.

  • For two people – 15 gallons per month
  • For three people – 25 gallons per month
  • For four people – 35 gallons per month

To be exact, you can use these numbers to know the cost of propane usage. You can calculate it with the propane’s price per gallon at your place. Hence, you will get the exact number of the costs.

While it may sound a lot, using a tankless water heater is cheaper in the long term than other traditional types. Therefore, you should consider it your ultimate choice for heating water in cold weather.

During tankless water heater installation, understanding the BTU rating is essential, as it directly impacts propane consumption. A higher BTU rating indicates the heater can produce more hot water quickly but will use more propane.

This balance is crucial for optimizing energy use and ensuring the system is efficient and capable of meeting your hot water needs.


To understand how much propane a tankless water heater uses, you need to know about this kind of water heater. Therefore, you could understand the answer to the latter question.

Knowing the general idea before making calculations will get you through some trouble. Hopefully, you now know better how much propane on-demand water heaters require.

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Heater Technician is a skilled author and water heater expert with years of experience in the field. He has authored several articles and books on various aspects of water heater installation, maintenance, and repair.