How to calculate boiler capacity? What Capacity thermal oil boiler you have?



The Boiler capacity is the maximum amount of water or fuel that can be heated at a specific time. The boiler capacity is also known as the maximum load.

What is the Boiler Capacity?

Boiler capacity is the amount of water that a boiler can heat. It’s measured in gallons per hour (GPH), British thermal units per hour (BTU/h), or pounds per square inch (psi). The higher the GPH number, the more heat you’ll produce, and your home will stay warmer during winter.

The most common way to measure boiler capacity is by calculating BTU/h or GPH based on how much fuel it takes to run a particular size tank over time:

  • For example, if you have an 8-gallon tank that produces 100 Btu/h at maximum efficiency and runs continuously for one hour—its total output is 121 Btu/h—your system will heat 125 gallons of water at 100 degrees Fahrenheit (F).

How to Calculate Boiler Capacity?

To calculate the boiler capacity, you must know its heat output and efficiency.

Heat Output: The unit of measurement for heat output is British Thermal Units per hour (Btu/hour). It is calculated by multiplying the boiler’s power by its steam pressure drop.

Efficiency: Efficiency measures how efficiently a heating system is at converting thermal energy into mechanical work. It varies from 0% – 100%. A higher value indicates better performance, but a lower number means less heat energy gets converted into mechanical work.

What Boiler Capacity unit you use?

The boiler capacity unit is the number of cubic meters of thermal oil stored in a tank. It calculates the amount of oil that can be stored in a tank.

What Capacity thermal oil boiler you have?

The boiler capacity should be calculated according to the thermal oil boiler and the heating system’s size. The calculation method may vary depending on your needs, but here are some typical examples:

  • For a 100 kW water heater (for example, boilers with a Capacity range between 40-100 kW), multiply by 1.5 or use an average figure based on your local industry standards. This will give you a rough estimate of how much electricity you need to generate for all this heat energy to be converted into usable hot water at once. You can also consider using electricity generated during peak hours when calculating actual usage figures; however, it’s always better if this still needs to be done!

The Capacity of a boiler depends on its size, heat output, and efficiency.

A boiler with an output of 10 kilowatts can produce more than 100-kilowatt hours per hour in one hour, but it will only be able to do so if it has enough water in the tank. If you want to calculate the Capacity of your boiler, ensure that there are enough gallons (liters) of water available at all times.

The efficiency rating of your boiler is also important when calculating how much energy it can produce per unit of time at its highest possible speed setting (this will be different depending on where you live).


The Capacity of a boiler depends on its size, heat output, and efficiency. An efficient boiler consumes less energy than a non-efficient one, producing less heat. The average boiler has an efficiency rating of 85% or above.