1. What is a Watts to BTU Calculator?

Definition: This calculator converts power measurements from watts to British Thermal Units per hour (BTU/h).

Purpose: It helps in comparing electrical power (watts) with thermal power (BTU/h), commonly used in heating and cooling systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Thermal power in BTU per hour
• \( P \) — Electrical power in watts
• 3.412 — Conversion factor (BTU/h per watt)

Explanation: This conversion is based on the International Table calorie definition where 1 watt equals 3.412 BTU per hour.

3. Importance of Watts to BTU Conversion

Details: Converting between these units is essential when comparing electrical heating systems with fuel-based systems or sizing HVAC equipment.

4. Using the Calculator

Tips: Simply enter the power in watts and the calculator will provide the equivalent in BTU/h. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 3.412?
A: This comes from the definition of BTU based on the International Table calorie, where 1 BTU = 1055.056 joules and 1 watt = 1 joule/second.

Q2: Is this conversion exact?
A: Yes, for the International Table BTU definition. Other BTU definitions may vary slightly (less than 0.1% difference).

Q3: When would I need this conversion?
A: Common uses include comparing electric heaters to gas heaters, sizing air conditioners, or calculating heat output of electrical devices.

Q4: Does this account for efficiency?
A: No, this is a direct unit conversion. Actual performance depends on device efficiency which isn't included here.

Q5: Can I convert BTU/h back to watts?
A: Yes, divide BTU/h by 3.412 to get watts. Our calculator may offer reverse calculation in future updates.