How to Calculate Heating-cable Energy Use and Cost

Daily kWh = power (W/m) × length (m) × hours / 1000; self-regulating ~60-70% of rated, constant-power with thermostat ~50-70% runtime. Monthly cost = daily kWh × tariff × 30. Good insulation cuts use 30-50%; choose self-regulating, optimize insulation, use zoned control.