1. What is a Steam Radiator BTU Calculator?

Definition: This calculator estimates the heat output (BTU/h) of a steam radiator based on its Equivalent Direct Radiation (EDR) measurement.

Purpose: It helps HVAC professionals and homeowners determine the heating capacity of steam radiators for proper system sizing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTU \) — British Thermal Units per hour (heat output)
• \( EDR \) — Equivalent Direct Radiation (square feet)
• \( 240 \) — Constant for steam at 215°F

Explanation: Each square foot of EDR produces approximately 240 BTU per hour with steam at 215°F.

3. Importance of BTU Calculation

Details: Proper BTU estimation ensures adequate heating capacity, energy efficiency, and comfortable room temperatures.

4. Using the Calculator

Tips: Enter the radiator's EDR in square feet. The EDR is typically stamped on the radiator or can be measured.

5. Frequently Asked Questions (FAQ)

Q1: What is EDR?
A: Equivalent Direct Radiation is a measure of a radiator's heating surface area equivalent to 1 square foot of cast iron radiator.

Q2: Why 240 BTU per sq ft EDR?
A: This is the standard output for steam radiators operating at 215°F (1 psi steam pressure).

Q3: Does this work for hot water radiators?
A: No, hot water radiators use a different factor (typically 150-170 BTU/sq ft EDR).

Q4: How do I find my radiator's EDR?
A: Check manufacturer specs, measure physical dimensions, or consult radiator sizing charts.

Q5: What if my steam pressure is different?
A: Higher pressures increase BTU output slightly - consult an HVAC professional for adjustments.