Electric Heater Sizing Calculator

Calculate heater element wattage, current draw, and resistance for industrial and process heating applications.

Heater supply voltage.
V
Required heating power.
W
1 for single-phase, 3 for three-phase.
Resistive heater: 1.0.

Results

Current Draw-A
Heater Resistance-Ω
Min Breaker Size (125%)-A
Heat Output-BTU/h
References: NEC Article 424 — Fixed Electric Space Heating; IEEE 515