1. What is a Heater Size Calculator?

Definition: This calculator determines the required heater size based on room heat loss and heater efficiency.

Purpose: It helps homeowners and HVAC professionals select properly sized heating equipment for optimal performance and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Heater size (kW)
• \( H \) — Heat loss (kW)
• \( E \) — Heater efficiency (dimensionless, 0-1)

Explanation: The heat loss is divided by the heater's efficiency to determine the required heater output capacity.

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures comfortable temperatures, energy efficiency, and prevents equipment short-cycling or inadequate heating.

4. Using the Calculator

Tips: Enter the room's heat loss in kW and the heater's efficiency (default 0.85 for 85% efficient units). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my room's heat loss?
A: Use a heat loss calculator or consult an HVAC professional who can perform a Manual J calculation.

Q2: What's a typical efficiency for heaters?
A: Electric heaters are ~100% efficient, gas heaters ~80-95%, heat pumps ~200-300% (use COP instead).

Q3: Should I round up the calculated size?
A: Yes, it's common practice to round up to the nearest standard heater size available.

Q4: Does this account for extreme weather?
A: No, consider adding 10-20% buffer for unusually cold climates or extreme weather conditions.

Q5: Can I use this for whole-house heating?
A: Yes, but you'll need the total heat loss for the entire building rather than a single room.