How Much Propane Does A Tankless Water Heater Use

A tankless water heater is a type of appliance that heats water on demand, without the need for a storage tank. These appliances are becoming increasingly popular due to their energy efficiency and space-saving design.

One of the most common questions about tankless water heaters is how much propane they use. The answer to this question can vary depending on a number of factors, including the size of the water heater, the climate in which it is used, and the hot water demand of the household.

How Much Propane Does A Tankless Water Heater Use

On average, a tankless water heater will use between 150 and 199 cubic feet of propane per hour of operation. This is equivalent to between 4.5 and 5.8 gallons of propane. However, it is important to note that these numbers are only estimates, and the actual amount of propane used will vary depending on the specific appliance and the conditions in which it is used.

To determine the exact amount of propane that a tankless water heater will use, it is best to consult the owner’s manual or the manufacturer’s website. These resources will provide detailed information about the propane usage of the specific model of water heater, as well as any other factors that may affect its fuel consumption.

In addition to the size and demand of the water heater, there are several other factors that can affect the amount of propane it uses. These include the temperature of the incoming water, the temperature of the water being heated, and the overall efficiency of the appliance.

How To Minimize Propane Usage?

To minimize propane usage and maximize the energy efficiency of a tankless water heater, it is important to maintain the appliance according to the manufacturer’s instructions. This may include regular cleaning and servicing, as well as ensuring that the water temperature and flow rate are set correctly.


Overall, a tankless water heater can be a highly efficient and cost-effective option for households that need a reliable source of hot water. By understanding the propane usage of these appliances and taking steps to optimize their performance, homeowners can enjoy the benefits of tankless water heating without sacrificing energy efficiency or affordability.

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