Why convert between Btu (IT)/hour and Btu (th)/hour?

Converting ensures accurate comparison and specification of heat transfer rates, as both units differ slightly in energy content which affects HVAC and heating equipment sizing.

Are these units used in the same applications?

Yes, both units are commonly used for rating HVAC systems, boilers, water heaters, and estimating building heat loads.

Is the conversion factor exactly one?

No, the conversion factor is very close to one but not exact, approximately 1.0006694671, which matters for precise engineering calculations.

How to Convert from Btu (IT)/hour to Btu (th)/hour

Learn the difference and conversion process between Btu (IT)/hour and Btu (th)/hour units for accurate heat transfer measurements. Easily convert power units used in HVAC and heating system applications.

Btu (IT)/hour [Btu/h]

Btu (th)/hour [Btu (th)/h]

Please check your input. It must be a valid numeric value.

Btu (IT)/hour [Btu/h] to Btu (th)/hour [Btu (th)/h] Conversion Table

Btu (IT)/hour [Btu/h]	Btu (th)/hour [Btu (th)/h]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Btu (IT)/hour [Btu/h] to Btu (th)/hour [Btu (th)/h] Conversion Table
Btu (IT)/hour [Btu/h]	Btu (th)/hour [Btu (th)/h]

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What Is This Tool?

This converter helps you change values from Btu (IT)/hour, a unit based on the International Table British thermal unit, to Btu (th)/hour, which uses the thermochemical British thermal unit. Both units measure power related to heat transfer but differ slightly in energy content.

How to Use This Tool?

Enter the numerical value in Btu (IT)/hour you want to convert
Select the source unit Btu (IT)/hour [Btu/h]
Choose the target unit Btu (th)/hour [Btu (th)/h]
Click the convert button to get the equivalent value
Review the converted output and apply it to your calculations or design

Key Features

Converts between Btu (IT)/hour and Btu (th)/hour power units accurately
Browser-based and easy to use without installing any software
Provides precise heat transfer unit conversions for HVAC and heating equipment
Includes examples for quick understanding
Supports applications in boiler, furnace, and heat exchanger sizing

Examples

Convert 5 Btu (IT)/hour to Btu (th)/hour to get approximately 5.0033 Btu (th)/hour
Convert 10 Btu (IT)/hour to Btu (th)/hour to obtain about 10.0067 Btu (th)/hour

Common Use Cases

Rating HVAC units and determining furnace or air conditioner capacities
Specifying heat output for boilers, water heaters, and gas furnaces
Estimating heat gain or loss in buildings for proper system design
Calculating refrigeration system capacity and heat exchanger requirements

Tips & Best Practices

Always convert between Btu (IT)/hour and Btu (th)/hour to match units in project specifications
Use this tool to ensure accuracy in heating and cooling equipment sizing
Verify conversion results when performing thermodynamic calculations that require precision
Consider small differences between these units critical in high accuracy engineering tasks

Limitations

Difference between Btu (IT) and Btu (th) is minor but significant for precision work
Neglecting conversion can cause slight errors in heat load and equipment sizing calculations
Both units approximate similar wattage values, so conversion results are close to 1:1
This tool is intended for unit conversion only and does not perform broader thermodynamic analysis

Frequently Asked Questions

Why convert between Btu (IT)/hour and Btu (th)/hour?: Converting ensures accurate comparison and specification of heat transfer rates, as both units differ slightly in energy content which affects HVAC and heating equipment sizing.
Are these units used in the same applications?: Yes, both units are commonly used for rating HVAC systems, boilers, water heaters, and estimating building heat loads.
Is the conversion factor exactly one?: No, the conversion factor is very close to one but not exact, approximately 1.0006694671, which matters for precise engineering calculations.

Key Terminology

Btu (IT)/hour: A power unit based on International Table British thermal unit delivered or removed per hour used to express heat transfer rates.
Btu (th)/hour: A power unit defined by thermochemical British thermal unit transferred per hour, measuring heating or cooling rates.
Conversion Rate: Factor used to convert a value from Btu (IT)/hour to Btu (th)/hour, approximately 1.0006694671.

Quick Knowledge Check

What does the unit Btu (IT)/hour measure?

Rate of heat transfer based on thermochemical Btu

Power equal to one International Table British thermal unit per hour

Energy consumed per hour in joules

Why is it important to convert between Btu (IT)/hour and Btu (th)/hour?

To adjust for different frequencies in HVAC systems

To accurately compare heat transfer rates using slightly different Btu definitions

To convert between power and energy units

Which of the following is a common use case of converting these units?

Estimating heat loss/gain in building heating systems

Measuring electrical resistance of HVAC wiring

Calculating water flow in plumbing

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