5 Best Dehumidifiers for Boats(That Keeps Your Boats As Dry As Possible)

Having moisture in your boat means a big disaster. Apart from the musty odor it may cause, dampness can actually cause rust. Installing a dehumidifier greatly reduces the chance of high humidity to sail onboard.

However, looking for the best dehumidifier for boats seems a bit challenging. There’s pretty much a sea of dehumidifiers to choose from but only a few deem fit your watercraft.

There are critical factors that you need to consider upon adding a dehumidifier for your boat. How long you place the device on board will determine the amount of total moisture that will be removed. Will it be for a few days or will it take more than a week or so? I got you covered with 5 options.

Find out which dehumidifier suits your needs.

What’s a Good Boat Dehumidifier?

You see, boats are different from RVs and houses. There are many outside factors that you have to acknowledge.

The salty air is the number one enemy of portable dehumidifiers. Why? Because most of these machines are made from domestic-grade metals and they cannot withstand the growth of rust.

And since these are portable dehumidifiers, they tend to wiggle or worse, fall off every time the boat moves, even when they are docked. Wind and tides will surely make the boat roll.

Another thing you have to think about is the drain option. If you plan on dehumidifying the boat in a short term, a water tank is fine but is not highly recommended if you leave it for a long period of time.

Desiccant or Compressor, Which One to Choose?

Now, this is where the argument begins. Many of my boat owner friends say that desiccant is better while some say that refrigerant or compressor is way excellent.

Perhaps, it all depends on you. Here’s a brief comparison between the two.

Desiccants are like sponges, they absorb the excess air moisture without having a compressor. While refrigerant dehumidifiers utilize compressors to suck the water vapor.

It all depends on what type of dehumidifier you will choose to use on your boat.

5 Best Dehumidifiers for Boats to Choose From

Just when you have docked and realized that excess moisture plus salty sea air end up causing havoc, you need to act on it right away. Here are your choices:

Ivation Thermo-Electric Dehumidifier


  • 9.6 x 14.1 x 7.2 inches
  • Quietly Absorbs 0.59L of excess moisture per day
  • 2L Water Tank Capacity

Specific Features:

  • Whisper-quiet Peltier technology
  • Easy to use on/off button
  • Water-full Indicator Light
  • Works best at 86° Fahrenheit -80% relative humidity

Quietly pulling in excess humidity of up to 20 ounces per day at 86° Fand 80% relative humidity, Ivation IVADM35 is the most ideal for your boat and other watercraft. It’s practically good for spaces up to 2,200 cubic feet.

Engineered with whisper-quiet Peltier technology and no moving parts, you are certain that no matter the splish and splash outside, this dehumidifier is still standing.

It’s basically simple to use with just a push of a button. However, I recommend that you must have a separate humidistat to check on the relative humidity levels.

This mid-sized dehumidifier can draw in about 20 ounces of water in a day and has a 2-liter tank capacity. It could have been better if it had a continuous drain option so you won’t have to pour the water out every day.

Fortunately, this unit has an indicator light to remind you that the tank is full and the entire device shuts off to ensure safety. The bucket is easy to remove and clean. There’s a secret handle at the back to assist you when transferring the unit, but it’s honestly very lightweight.

Should you leave this unit inside the boat? With the safety features set, I still do not recommend leaving this unit turned on inside the boat unattended.

Overall, this dehumidifier is quite small in coverage so you better check your boat’s dimensions before choosing this unit.

2 Pack Boat Dehumidifier


  • 6.18 x 5.75 x 5.28 inches
  • 375g of Moisture-absorbing pellets
  • Lasts up to 30 days

Specific Features:

  • With Activated Charcoal
  • Unscented for Optimum Performance
  • Marine-grade

Developed by boaters for boaters. This is the most essential thing you have to bear in mind upon purchasing a dehumidifier. Remember, no one knows exactly how it feels when you step inside the boat in a very dry and humid environment, except for fellow boaters.

Better Boat Disposable Boat Dehumidifier is made of moisture-absorbing pellets packed with activated charcoal to keep your vessel fresh and clean for up to 30 days.

There are no complicated processes to do in order to remove the extra air moisture. Simply unpack the product, peel off the sticker, and voila! You can practically put this tub inside the cabins, closets, bathrooms, or anywhere where the moisture is trapped.

What I love about this product is that you don’t need to check on it from time to time since the dehumidifier is non-electric. However, the only downside of this desiccant is that you do not know how much moisture or humidity you have inside, well, at least, if you have an external hygrometer though.

But since this product is more cost-effective than most of the units listed, perhaps you won’t mind placing a tub in every corner of your boat.

InvisiPure Hydrowave Dehumidifier


  • 9.8 x 6.1 x 13.9 inches
  • 0.80L of moisture per day
  • 2L Water Tank Capacity/ Continuous Drain

Specific Features:

  • Auto Shut-off
  • Super Quiet Electric Peltier Technology
  • Dual Air Vents
  • Built-in Handles
  • Washable Air Filter

Muggy and musty boats are a common sight after they’ve been docked for a long time. Dehumidifying is an essential thing to do to eliminate the growth of mold, bacteria, and even condensation.

However, you don’t just dehumidify it with any devices available. You need a special dehumidifier that’s built for boats. The InvisiPure Hydrowave Dehumidifier does not only remove excess air moisture that causes the muggy environment but also ensures that you get maximum health benefits.

This dehumidifier highlights a Thermo-Electric Cooling Technology (Peltier) that operates without a compressor. You are on for a quiet & efficient operation for spaces up to 300 sq ft, perfect for a spring boat ride.

It can remove about 0.80L of water in a day based on a humidity rate of 80% and with a temperature of 86F. The water collected is then stored in a 2-liter tank or you can opt to use the continuous drain feature with a 3/8" hose.

You can simply place this unit in areas where dampness is present since this unit is compact and lightweight. There are handles on the side for quick and faster carrying and you can simply remove the filter and wash since it’s reusable.

Such a clever little dehumidifier that you can tag along to keep your vessel in ship shape.

ALROCKET Dehumidifier


  • 5.7 x 5.7 x 8.9 inches
  • Absorbs 450ml of water per day
  • 1L Water Tank Capacity

Specific Features:

  • Auto-Shutoff
  • One-touch switch design
  • 40W/hour Energy saving
  • Built-in Thermo-Electric Tech(Peltier)
  • 7-Color Indicator Lights
  • Easy to carry and relocate
  • Semiconductor Refrigeration Technology

Getting ready for a spring boat ride? Gear up and dehumidify your boat with an ALROCKET DH-CS01 Dehumidifier. It effectively removes excess air moisture and adjusts indoor humidity to a more comfortable and breathable level for spaces up to 260 sq ft and a room temperature between 68 ℉-86 ℉ (20-30°C) and with a relative humidity of 80%.

It’s powered with a Thermo-Electric Peltier Module and does not require a compressor. So expect a very quiet machine! Plus it has a semiconductor refrigeration technology that condenses the warm air into droplets.

ALROCKET also features an energy-saving dehumidifier that only consumes 40W/hr and a one-touch switch build. There are no complicated features in this particular model, in fact, the design is very upfront. You can hold the built-in carrying handles on top for easier transport and swiftly remove the 1-liter water tank at the bottom.

The water tank is transparent so you can see the water level aside from the full water tank indicator light. Speaking of illumination, you can set your mood with 7 colorful LED lights to match your boat’s ambiance.

If you intend to keep this device on while sleeping, you can simply turn off the LED and it will peacefully suck in unwanted air moisture.

Quite impressive when it comes to dehumidification but I find the water tank too small for a humid boat. It usually takes a day to get the tank full for me, but if you are in a humid area, then it could be sooner. I highly recommend this for small watercraft only.

AMRD-1458 Davis Air-Dryr Marine Dehumidifier


  • 13.5 inches circular unit
  • Designed for 24-hour operation

Specific Features:

  • Neutral beige polycarbonate casing
  • Safe for marine use
  • Uses natural convection

If you have relied on dry crystals for so long, well, it’s high time to change the game. Davis Instruments specially made a marine-grade portable dehumidifier for boats. This Air-Dryr 1000 is made of U.L. recommended polycarbonate plastic with an aluminum bottom panel that holds the tubular metal heating.

It’s round in shape and does not take much space nor weighs in too much. In fact, this dehumidifier is simple that you just need to plug it in and leave. This particular round model is designed to work for full 24 hours in removing excess moisture.

This device draws the cool damp air through the base panel and is then heated and released to the top surface. It does not have a fan, a thermostat, and a switch, Just give it a little time around 15-20mins after plugging in and the dehumidifier will start to draw in moisture.

For greater results, place this machine in an upright position on the floor and at an enclosed area not exceeding 1000 cubic feet. However, you should be careful not to place this device on a carpeted flooring since it might restrict the way this dehumidifier works.

I love the idea that it’s uniquely made for boats. In terms of efficiency, this dehumidifier is excellent. It’s also pretty convenient, it’s a plug-and-play kind of dehumidifier.

However, you might need to check on the RH levels from time to time to see if there have been any differences.

Which IsThe Best Dehumidifier for Boat?

Better Boat Disposable Moisture Absorber with Activated Charcoal is my top choice.

Why? My first concern is safety. Although so many units are packed with anti-spill features, still you cannot afford to risk an electrical appliance inside a moving vessel. Although most boats are docked, still, the wind and the wave can rock them.

Next is convenience. You can leave them anywhere in the boat and let it bust off high humidity on its own.

Lastly is the price of this unit. Imagine, you can already have two packs of this boat dehumidifier at 13 oz each for a very affordable price.

Compared to many sophisticated models out there that you can use inside the boat, this product is by far highly recommended by boaters for boaters.

I bet you had a trip to the marina today and you are too excited to go for a spring boat ride only to find out that dampness had taken over your vessel. Don’t worry, placing a dehumidifier can definitely remove all the excess moisture that can cause mold and bacteria build-up.

The best dehumidifier for your boat is something you can trust that whatever the weather may be out there, it still does its job. I have given you five products to choose from. It’s up to you how you want to keep that mildew and mold at bay.

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