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When designing a tank heating application, you need to make sure that you have enough wattage in your immersion heaters to achieve the target temperature in your preferred timespan. That’s why we’ve created the Heatmax Calculator—your go-to tool to assess the wattage needs of your tank heating application.

This resource simplifies the process of determining the necessary wattage for a tank heater. It not only calculates the thermal power required to raise the temperature of a liquid solution but also calculates the heat lost to the outside environment that will need to be replaced.

Please note that all displayed wattage totals and subtotals incorporate a 20% safety margin.
Please note: Although this tool employs the same mathematical principles we utilize for calculating wattages, we cannot assume responsibility for any inaccuracies or improper use of the calculator. Moreover, outcomes derived from this calculator should not be interpreted as a guarantee for any product.
Immersion Heater Wattage Calculator: A tool that makes calculating your wattage needs easy. Once you've determined how much wattage you need, speak to one of our experts about the best heater design, watt density and sheath material for your project, or submit a request for quote and one of our team members will get back to you within 24 hours. All wattage totals and subtotals shown include a 20% safety factor. View Immersion Heaters
Units:     Imperial     Metric
  Step 1: Find the liquid's properties.
Material Specific Heat Boiling Point Density
Look up properties:
I'll input my liquid's properties:		 cal g • K °F lb / ft³kg / m³
 

Select if your immersion heater will be maintaining or increasing temperature.

Step 2: Enter the process details for your liquid.
Volume of Liquid Starting Temp. Ending Temp. Time to Reach Temp.
gal.L °F°C °F°C hr, min.
Step 2: Enter the process details for your liquid.
Volume of Liquid Maintenance Temp. Time to Reach Temp.
gal.L °F°C hr, min.

Total wattage required to raise liquid to operating temperature:

0 watts

 
 

Check here if you will be adding solid objects to this tank. (This opens steps 1a and 2a for properties of your object.) You can uncheck this to remove this subtotal from the total wattage.

Step 1a: Find the solid object's properties.
Material Specific Heat Melting Point Density
Look up properties:
I know the object's thermal properties:		 cal g • K °F°C

Show note

 lb / ft³kg / m³
  Step 2a: Enter the process details for your solid object.
Weight of Solid Temp. When Inserted Temp. When Removed Time Immersed
 I know the object's weight: lb.kg  Calculate from object's dimensions: × × in.cm
Calculated weight: lb.kg
 °F°C °F°C

Show note

 hr, min.

Total wattage required to raise solid object to operating temperature:

 
 
 

Step 3: Find surface area of your tank (for wattage loss calculations).

Tank Shape Tank Measurements Surface Area
Square/Rectangular Cylindrical Other (or input surface area directly)

ftcm in.

ft in.

ftcm in.

ftcm in.

If your tank has an irregular shape, this calculator will not be able to find its surface area. You'll need to take measurements to find the side, top, and bottom surface areas; you can then use them in the calculator by putting them in the next column of this table.

ft²m²

ft²

ft²m²
  Step 4: Find total wattage losses.
Ambient Air Temp. Tank Wall Material Wattage Losses per ft²m² Total Wattage Losses
°F°C Top:
Sides:
Bottom:

Total wattage losses from all walls at operating temperature:

0 watts

 
 

Total heating wattage required from immersion heater:

0 watts

Please note that, while this tool uses the same math we use to calculate wattages, we cannot be liable for incorrect information or misuse of the calculator, and results from this calculator do not constitute a guarantee on any product.

Let's Discuss Your Project

If you have any doubts, questions, or need additional assistance while using the Heatmax Calculator, don't hesitate to reach out. Our dedicated team can provide expert advice, understand your unique requirements, and help you find the right heating solution for your specifications.
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