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Kasco De-Icer 2400 1/2 HP $968.00 - $2,643.00Kasco 2400D Series 1/2HP - Energy Efficient/Cost Effective #1 Deicer Brand in The World The Kasco 1/2HP De-icer generates an impressive 31 lbs of thrust per minute, solidifying its position as the most powerful 1/2HP deicer in the market. With over 50...$968.00 - $2,643.00 -
Kasco De-Icer 3400 3/4 Horsepower Dock De-icer $1,057.00 - $2,735.00Kasco 3400D Series 3/4HP - Best Selling Deicer Brand World Wide The Kacsco 3/4HP De-Icer, will help get your pond or lake winter ready, generating 37 lbs of thrust per minute this de-icer was designed to: Protect Your Waterfront Property from...$1,057.00 - $2,735.00 -
Kasco De-Icer 4400 One Horsepower Dock Deicer $1,165.00 - $3,441.00Kasco 4400D Series 1HP - Energy Efficient #1 Selling Deicer Brand Designed to combat the harsh elements, the Kasco 4400D Series deicer employs a 1 horsepower motor, generating an unparalleled 42 lbs of thrust to: Prevent Ice Formation in Target...$1,165.00 - $3,441.00
Dock Deicers for Marinas & Lakes
Dock & Lake De-icers (Kasco) — Protect Docks, Lifts, & Boats All Winter
Stop ice damage before it starts. Kasco propeller de-icers (½, ¾, 1 HP) pull warmer subsurface water to the surface to maintain open water around docks, lifts, boats and pilings. Choose the right horsepower and mounting angle for your climate and layout, add a smart controller to cut runtime, and enjoy fast, free shipping and a 3-year manufacturer’s warranty on Kasco D-Series de-icers.
Find Your Size Installation Basics FAQs Shop by Model
How a Kasco De-icer Prevents Ice Damage
- Engineered water movement: A submerged propeller circulates denser, slightly warmer water from depth to the surface, disrupting ice formation.
- Choose the opening shape: Vertical mounting creates a circular opening; angled mounting throws flow along docks/seawalls to create an elongated lane that protects multiple slips or boat lifts.
- High-thrust performance: Properly sized units maintain open water in tough conditions and relieve damaging pressure from “ice jacking”.
- Add smart controls: Run only when temperatures drop, or within set time windows, to reduce energy use while keeping target areas open.
Sizing Guide — Choose the Right HP & Orientation
Select horsepower and mounting based on winter severity, target area, obstructions, and depth. The tables show typical results in unobstructed water; actual openings vary with wind, currents, depth, and geometry.
| HP | 34–20 °F | 19–10 °F | 9–0 °F | < 0 °F |
|---|---|---|---|---|
| ½ HP | ≈ 65 ft | ≈ 50 ft | ≈ 45 ft | ≈ 35 ft |
| ¾ HP | ≈ 85 ft | ≈ 70 ft | ≈ 65 ft | ≈ 45 ft |
| 1 HP | ≈ 95 ft | ≈ 80 ft | ≈ 75 ft | ≈ 55 ft |
Assumes ~4–6 ft depth with unit at least 1 ft above bottom. Colder temps reduce opening size.
| HP | 34–20 °F | 19–10 °F | 9–0 °F | < 0 °F |
|---|---|---|---|---|
| ½ HP | ≈ 30 ft × 100 ft | ≈ 25 ft × 60 ft | ≈ 25 ft × 50 ft | ≈ 20 ft × 40 ft |
| ¾ HP | ≈ 35 ft × 120 ft | ≈ 30 ft × 80 ft | ≈ 30 ft × 75 ft | ≈ 25 ft × 50 ft |
| 1 HP | ≈ 40 ft × 150 ft | ≈ 35 ft × 90 ft | ≈ 35 ft × 85 ft | ≈ 30 ft × 60 ft |
Angled mounting throws flow along a dock or seawall to protect multiple slips and lifts.
Vertical Mount — Diameter
½ HP
¾ HP
1 HP
Angled Mount — Lane (W × L)
½ HP
¾ HP
1 HP
Tip: If depth is < ~4 ft or your layout is complex, consider the next horsepower up or contact a pond expert.
Shop by Model
- Kasco 2400D — ½ HP · 120V · Min depth: 4 ft · Thrust: ~31 lb · Cord: 25–200 ft
- Kasco 3400D — ¾ HP · 120V · Min depth: 4 ft · Thrust: ~37 lb · Cord: 25–200 ft
- Kasco 4400D — 1 HP · 120V · Min depth: 4 ft · Thrust: ~42 lb · Cord: 25–200 ft
See controllers, mounts, props & anodes
De-icer vs. Bubbler (Air): Which Is Right for You?
| Propeller De-icer (Kasco) | Dock “Bubbler” (Air) | |
|---|---|---|
| How it works | Moves water with a propeller, pulling warmer water up to prevent freezing. | Blows air from a diffuser; rising bubbles circulate water locally. |
| Best for | Marinas, multiple slips, strong currents, severe winters, larger openings. | Smaller decorative ponds or moderate conditions. |
| Orientation | Vertical (circle) or angled (lane) to match your layout. | Fixed diffusers; coverage shaped by bubble plume. |
| Accessories | Thermostat/time controls, dock mounts, horizontal float. | Airline, diffuser, cabinet, and pump maintenance. |
For warm-season water movement (not de-icing), consider dock circulators.
Smart Controls & Accessories
- C-10 Thermostat (120V): Turns your de-icer on only when air temperature falls below your set point (commonly near 30 °F), reducing runtime and cost.
- C-20 Time + Temperature (120V): Runs the unit only when both your chosen temperature threshold and time window are met.
- Mounting options: Universal and industrial dock mounts let you set precise angles; two 20 ft mooring ropes are included with each unit for suspended installs.
- Service parts: Replacement props and zinc anodes keep performance and protection high in fresh or saltwater.
Browse controllers, mounts & parts
Installation Basics & Safety
- Depth & clearance: Target ~4–6 ft water depth; keep the unit at least 1 ft above bottom.
- Orientation: Use vertical for a circular opening; angle the motor toward the area you want to keep clear for an elongated lane along docks or seawalls.
- Rope spacing: When suspending, keep the two mooring lines about 8 ft apart to avoid twisting during start-up torque.
- Power: Plug into a properly grounded GFCI outlet. Follow local electrical codes and manufacturer instructions.
- Safety: Post “Thin Ice / Open Water” signage where people or pets could approach open water.
See installation guide on product page
Trusted Performance
Kasco de-icers have been used for decades by marinas, municipalities and lakefront owners. They even played a role in a widely publicized whale rescue in Alaska—proof of reliability in extreme conditions.
FAQs
Which size de-icer should I buy?
Use the sizing tables above as a starting point. As a rule: ½ HP for small docks/modest freeze, ¾ HP for medium docks/colder climates, and 1 HP for marinas or severe freeze. For complex layouts, ask a pond expert.
Vertical or angled mounting?
Vertical makes a circular opening. Angled creates an elongated lane along docks or seawalls—ideal for protecting multiple slips or a boat lift.
How deep should I place it?
Aim for ~4–6 ft water depth with at least 1 ft clearance above bottom to avoid debris intake and maximize circulation.
How much area will it keep open?
See the tables above by HP, temperature and mounting orientation. Actual results vary with wind, currents, water depth and obstructions.
Will a controller save energy?
Yes. The C-10 thermostat runs only when air temperature drops below your set point; the C-20 adds a timer so the unit runs only in your scheduled window and below your set point.
What’s the warranty?
Kasco ½, ¾ and 1 HP de-icers include a 3-year manufacturer’s warranty.
Are these safe for fish?
Yes—by maintaining openings for gas exchange in winter. Avoid placing units where fish could be drawn against the intake and always follow the manual for clearance and operation.
Can I leave my dock in the water all winter?
Many dock owners do—de-icing helps prevent the pressure and lift damage associated with ice (“ice jacking”). Follow local regulations and post safety signage.
When should I install it?
Install in late fall before freeze-up, so you’re ready for the season’s first cold snaps.
Shop Kasco De-icers Shop Controllers & Mounts Cold Weather Pond Care Talk to a Pond Expert
Why use a dock deicer?
A dock deicer is useful to keep boat docks ice free during cold winter months. Preventing ice damage saves marinas and boat owners from costly repairs.
Kasco deicers lead the industry in water thrust to keep large openings in the ice. Thrust generates water velocity which moves large volumes of warmer water quickl to the surface.
Dock deicers work by using a propeller to keep the water around the dock from freezing. The the propeller creates water movement, which helps to prevent ice from forming. The deicing motor forces warmer water to the surface where it eats the ice away. Water deicers prevent ice damage to docks and boats in winter by keeping the water around the dock free from ice.
Dock deicers save marinas and boat owners money and keep the area safe and easy to use in winter. Kasco deicers easily maintain large openings in the ice with their powerful thrust and circulation.
Why does Kasco sound familiar?
If the name Kasco Marine sounds familiar, it's probably because of the commercial deicer's role in the movie "Big Miracle". The lake deicer was used to help rescue three California gray whales trapped in the ice near Barrow, Alaska in 1988. The stranded whales were using one small remaining hole in the ice and open water was too far for them to reach.
As temperatures dropped below minus 13 degrees Fahrenheit, the situation became dire. The Kasco deicer was used to keep a series of breathing holes cut in the ice open during the brutally cold nights. Eventually the whales used the series of breathing holes and a channel opened by an icebreaker ship to safely reach open water.
Premium Pond Deicers
The design of dock deicers revolves around a propeller that continually churns the water surrounding the dock. By constantly creating water movement, the deicer effectively hinders ice formation. This constant movement stops ice from forming and breaks up any ice that is already there.
The deicing propeller pushes warm water up to melt the ice, creating a clear path without any ice. This process not only safeguards the docks themselves but also protects the boats moored nearby. The Kasco units are used as pond deicers, stock tank deicers, and boat deicers.
In addition to its practical benefits, a dock deicer also enhances the overall experience for marina visitors. Deicers provide openings in the ice for wildlife to use and allow transfer of gasses from under the ice.
See Kasco Marine Deicing in action below.
Send my dock layout for sizing
Attach your dock plan or photos and tell us about your winter conditions. A pond expert will size a Kasco de-icer and email you a recommendation.
Having trouble? Email support@naturalwaterscapes.com and attach your layout.