How Much Electricity Does a Dock De-Icer Use?
A one-horsepower dock de-icer draws between roughly 600 and 1,100 volt-amperes. At a typical US residential electricity rate this works out to a rough estimated range of about $60 to $120 per month for continuous operation, though the true cost depends on the motor's real power factor and your local electricity rate. Automated thermostat or timer controls can meaningfully reduce that cost.
Amps vs Watts: Apparent Power vs Real Power
Manufacturers publish electrical current in amperes, not true real power in watts. Multiplying volts by amps gives apparent power in volt-amperes (VA). Real power in watts equals volts times amps times the power factor. Single-phase induction motors commonly run at a power factor between about 0.75 and 0.88 under continuous fluid load, so treating published VA figures as if they were watts overstates true active power draw.
Kasco D-Series Electrical Draw
| Model | HP | Voltage | Amps | Apparent Power (VA) |
|---|---|---|---|---|
| Kasco 2400D | 1/2 HP | 120V | 5.4A | 648 VA |
| Kasco 3400D | 3/4 HP | 120V | 6.6A | 792 VA |
| Kasco 3400HD | 3/4 HP | 208-240V | 3.1A | 744 VA |
| Kasco 4400D | 1 HP | 120V | 9.1A | 1,092 VA |
| Kasco 4400HD | 1 HP | 208-240V | 4.5A | 1,080 VA |
Reducing Electricity Cost: Control Options
- Thermostat control panels (such as Kasco C-10): Cut power when air temperature rises above a set point, reducing runtime hours.
- Thermostat plus timer panels (such as Kasco C-20): Combine temperature sensing with an off-peak timing window for further savings.
- Duty-cycling pulse controllers: A category of third-party accessory that cycles the motor on and off on a programmed schedule to reduce average power draw. Specific brands and duty-cycle percentages vary by manufacturer; obtain verified performance figures directly from whichever manufacturer you are considering rather than relying on a single unverified number.