7 Best Safe Dehumidifiers (2020) – For Fireproof & Waterproof Safes

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Our top Pick

Hornady Rechargeable Gun Safe Dehumidifier


Our pick for the best safe dehumidifier is the Hornady. It’s sleek, thin, and can be mounted on the wall of a safe. Batteries not required.

A safe will often get water buildup inside of it, especially if the safe is sealed off from the outside world. Ironically, the moisture is even worse in waterproof safes and fireproof safes. (For more information on keeping fireproof safes dry, see our discussion in our best fireproof safes review).

The humidity can cause a terrible smell and water damage when the condensation collects on surfaces of valuables.

A dehumidifier can help reduce the build-up of condensation in a safe. So for this article, we conducted research into a range of safe dehumidifiers and ranked them based on our selection criteria listed at the end of this article.

In our opinion, the best safe dehumidifiers are:

  • Hornady Rechargeable Gun Safe Dehumidifier – Best dehumidifier for gun safes
  • Eva-Dry E-333 Hanging Dehumidifier – Best for hanging
  • Pro Breeze Electric Mini Dehumidifier – Most Powerful
  • Eva-dry E-333 Renewable & Cordless Mini Dehumidifier
  • Zarpax Reusable Outdoor Gear and Gun Safe Dehumidifier
  • SnapSafe Gun Safe Dehumidifier Rod
  • SnapSafe Cylinder Dehumidifier

Note that these are examples selected for our circumstances, and do not represent advice to you or your circumstances, professional or otherwise.

Best Safe Dehumidifiers

Rank

Safe Dehumidifier

Recharge Type

Strength

Quick Review

Our Rating

1 Hornady Rechargeable Gun Safe Dehumidifier Wall Socket 333 cubic feet This is a dehumidifier that can be mounted on the wall of a safe. We think it looks nice and sleek. (Check Today’s Price on Amazon)

8.5/10

2 Eva-Dry E-333 Hanging Dehumidifier Wall Socket 333 cubic feet This is a dehumidifier that can be hung from a rail or hook. (Check Today’s Price on Amazon)

8.5/10

3 Pro Breeze Electric Mini Dehumidifier Requires Constant Power 1200 cubic feet This dehumidifier is for serious moisture problems. It’s the most powerful on the list in our opinion, but also needs to be constantly plugged in. (Check Today’s Price on Amazon)

8/10

4 Eva-dry E-333 Renewable & Cordless Mini Dehumidifier

Wall Socket

333 cubic feet

This is a dehumidifier that needs a little bit of shelf space and requires recharging about once every 3 – 4 weeks. It recharges by plugging into a power socket overnight. (Check Today’s Price on Amazon)

8/10

5 Zarpax Reusable Outdoor Gear and Gun Safe Dehumidifier Microwave Undisclosed The interesting thing about this dehumidifier is that it’s recharged by zapping it in the microwave! The 4 pack adds extra punch. (Check Today’s Price on Amazon)

7/10

6 SnapSafe Gun Safe Dehumidifier Rod Requires Constant Power 200 cubic feet We like that this one is a really small, discrete dehumidifier. (Check Today’s Price on Amazon)

7/10

7 SnapSafe Cylinder Dehumidifier Oven 57 cubic feet This dehumidifier has got a nice metal look, but it could rust unlike plastic models. (Check Today’s Price on Amazon)

7/10

1. Hornady Rechargeable Gun Safe Dehumidifier – Best for Gun Safes

Quick Review: This is a dehumidifier that can be mounted on the wall of a safe. We think it looks nice and sleek.


The cool thing about this product is that it comes with a wall mount. That means it doesn’t take up any floor or shelf space in a safe. On top of that, it ends up looking really neat once mounted.

But keep in mind that the mount needs to be screwed or drilled into the wall of the safe. This is often not possible – and can be a hassle. We would even consider using superglue to attach the mount to the safe in a location that is not upholstered to ensure we don’t break the safe’s fireproof or waterproof seal.

We also think this one looks the sleekest of any product on this list.

Its power is about average – they recommend you place in in a space no larger than 333 cubic feet.

It needs to be recharged about once a month or so (by plugging it into a wall socket for 10 – 12 hours). There’s a simple window into the silica gel to see when it changes color and a color spectrum guide to see how close it is to needing a recharge. The color spectrum gauge is nice and clear.

When the silica gel needs recharging (drying out), the dehumidifier has to be taken off the mount and pluged into a wall socket for 10-12 hours, or overnight.

We Like…

Keep in Mind…

Doesn’t take up Shelf Space: We like that you can mount it on the wall of a safe.

Medium Strength: It should be recharged about once a month and works in a moderately sized safe.

No Power Required to Operate: While you do need to plug it into a wall socket to recharge, during operation it can be used in a safe without being plugged in.

Nice Sleek Look: We like that it’s small and looks neat when mounted.

Needs to be Recharged Monthly: This depends on how humid the safe gets. You might be able to get away with charging it less often – it’s something that needs to be tested out to see how long it lasts.

The Mount can be hard to Install: It’s not always easy to drill a hole in the wall of a safe. We would consider sticking the mount to the wall with superglue instead.

2. Eva-Dry E-333 Hanging Dehumidifier

Quick Review: This is a dehumidifier that can be hung from a rail or hook.


By far the biggest attraction of this set is that they can be hung on rails or hooks in your safe.

So, the first question we’d need to ask ourselves is simply: do we have a hook or rail in our safe to hang them? If not, well there’s really no point in getting them just for that feature.

Besides the hooks, this humidifier is quite similar to others on this list – and is in fact the hanging version of the other Ezy-Dry dehumidifier that we discuss later.

This kit also has the added benefit of being a two-in-one kit. So, one can be recharging while the other one is at work, and they can just be swapped out regularly.

We Like…

Keep in Mind…

Two in One Set: We like that you get two, so one can always be on charge while the other is in use.

Generally Good Specs: For all other features this one sits in the ‘average’ range.

Hangable: The biggest benefit of this one is that it’s hangable!

Just Average: Apart from the hanging hooks and the fact you get two in one, there isn’t anything that jumps out as outstandingly better than any other dehumidifer in our opinion.

3. Pro Breeze Electric Mini Dehumidifier

Quick Review: This dehumidifier is for serious moisture problems. It’s the most powerful on the list in our opinion, but also needs to be constantly plugged in.


This dehumidifier is the strongest on the list in our opinion, capable of dehumidifying a space of 1200 cubic feet. Instead of collecting the moisture in silica balls, it directs the water into a reservoir (purple in the image) that needs to be drained periodically (so it doesn’t need recharging – it’s designed for people to just drain the water and turn it back on!).

So, we feel this dehumidifier would be good for battling a serious moisture problem in a large safe.

There are two big downsides to this one though.

First, it’s big. You’ll only be able to us this in a large safe such as a rifle safe as it’s going to take up a lot of shelf space.

Second, it needs to be constantly plugged in. Meaning there needs to be power running into the safe and a power point on the inside.

So this isn’t for everyone, but it may be an absolute lifesaver in the right circumstances.

We Like…

Keep in Mind…

Powerful: This one’s capable of working in an area as big as 1200 cubic feet, making it the most powerful on the list in our opinion.

Doesn’t need Recharging: The only maintenance is simply tipping out the water that accumulated in the reservoir every now and then.

Needs to be Constantly Plugged in: If there isn’t power coming into the safe, you won’t be able to use this one.

Takes up Floor Space: While it’s the most powerful in our opinion, it is also the biggest, so it’s only really good for larger safes.

4. Eva-dry E-333 Renewable Mini Dehumidifier

Quick Review: This is a dehumidifier that needs a little bit of shelf space and requires recharging about once every 3 – 4 weeks. It recharges by plugging into a power socket overnight.


This set of small dehumidifiers fit exactly within the mid-range for all their features. They’re capable of dehumidifying a 333 cubic feet location for about 20-30 days. That’s about average. They are recharged by plugging them into a wall socket overnight (10 – 12 hours). That’s about average. They use silica gel to absorb humidity. That’s about average.

So, what’s the point of getting these ones?

The biggest drawing card here is that you get a set of 2. This means you can charge one, take it up to your cabin, and swap them out – no hassle. It’s a clean swap and beats having to remember to charge and replace the item overnight.

So we’d get these ones if we were likely to sit in our car on the way home and and go “Oh crap! I forgot to take the dehumidifier off the charger!” This might address that problem.

We Like…

Keep in Mind…

Two in One Set: We like that you get two, so one can always be on charge while the other is in use.

Generally Good Specs: For all other features this one sits in the ‘average’ range.

Requires Shelf Space: It’s small and discrete, but we think you’ll still need to find space on the floor or shelf of your safe to store it.

5. Zarpax Reusable Outdoor Gear and Gun Safe Dehumidifier

Quick Review: The interesting thing about this dehumidifier is that it’s recharged by zapping it in the microwave! The 4 pack adds extra punch.


This is a set of microwavable dehumidifying bags. Simply throw them in the microwave for 4 minutes at 600W and they’re all zapped and ready to start absorbing moisture again.

We love that you can throw all four into the safe and really ensure you’ve got all your bases covered.

You could even throw these silica packs into a fireproof document bag to keep it dry.

The thing on our mind, though, is that we’ve had similar packs to this before, and the microwave appears to do some damage to these sorts of products over the longer-term. If you leave it in the microwave too long, it may start to burn; and sometimes we do not even notice the damage we’re doing to the silica gel inside the bag.

The other thing that concerns us is that we feel it doesn’t have a very clear humidity indicator. It’s supposed to turn pink – but we’d prefer to have the nice large clear hole that the other products have so you can actually see the silica gel balls and how full they are of water.

We Like…

Keep in Mind…

Compact: These are nice small gel packs that you can keep in any safe. and it’ll go to work dehumidifying the space.

Fast Recharge: The microwaveable recharge is the fastest way to recharge a dehumidifier.

Beware of Overheating: The bag will be very hot when removed from microwave, and if left it in for too long it could overheat and burn.

Not a Clear Humidity Indicator: We think other products on this list have better humidity indicators.

6. SnapSafe Gun Safe Dehumidifier Rod

Quick Review: We like that this one is a really small, discrete dehumidifier.


This rod is a really clever idea. It’s so tiny and can be leaned up against a corner so it takes up nearly no space at all.

We also like that you can get the safe in three different lengths – 12, 18 and 24 inches.

But we’d lean towards getting the longest one that’ll fit in the safe, because they’re not the most powerful dehumidifiers in the world.

We were surprised that the 18 inch rod is only recommended for a 200 cubic feet space. Usually dehumidifiers that require constant power have the advantage of being much stronger – but that advantage doesn’t seem to be present for this one.

Something we’d also keep in mind here is that this one needs to be plugged in at all times, so there needs to be a power outlet in the safe. If the safe doesn’t have an internal power socket, this might be a deal breaker for us.

The rod also comes with two removable ‘feet’ so it can stand and not roll, although we think we’d just lean ours against the back wall of the safe in the corner.

We Like…

Keep in Mind…

Choose your Length: You can but a 12 inch, 18 inch or 24 inch rod. We’d the longest one that will fit in our safe.

Very Discrete: We like that it’s so small and long that you can squeeze it into a corner of the safe and it’s barely even noticeable.

Needs to be Plugged In: If the safe doesn’t have an internal power point, it’s a deal breaker.

Not as Strong as Some: We were surprised that it’s not as powerful as we expected, given it’s plugged into a power point at all times.

7. SnapSafe Cylinder Dehumidifier

Quick Review: This dehumidifier has got a nice metal look, but it could rust unlike plastic models.


When we first saw this dehumidifier we thought it looked really cool. It’s an all-metal 5 inch diameter cylinder that you can simply place on the shelf of your safe and walk away.

The other cool feature of this one is you recharge it by placing it in the oven at 325ºF for two hours. So you don’t need to wait overnight for it to be fully recharged … although placing it in the oven is a little more work than simply plugging it in and walking away. So while we think it’s a neat way to recharge your silica gel, the novelty will wear off before long for us.

We have two main concerns.

The first is that it’s not particularly powerful. It’s recommended for use in a 57 cubic feet space, which is well below some competitors.

The second is that it is metal – so prone to rusting. Given that it’s going to be placed it in a damp, dark space, that’s a concern for us.

We Like…

Keep in Mind…

Fast Recharge: While most products need to be plugged in for 10-12 hours for recharge, this one recharges in an oven in just 2 hours.

Prone to Rust: We don’t want to get a metal dehumidifier because it’s going to be placed in a damp dark space where it’s likely to rust pretty quickly we feel.

Not the Strongest: There are stronger dehumifidiers on the market.

Why do Safes Get Humid?

A safe will often get water buildup inside of it, especially if the safe is sealed off from the outside world. Ironically, if the safe is fireproof or waterproof, the humidity issue is even worse. That’s because the safe has created its own internal ecosystem and it cannot use external air to regulate the humidity levels.

A safe – even a waterproof safe – will always have H2O inside it. The air in the safe is full of moisture. The objects, woods and carpets inside the safe all contain moisture.

Over time, the moisture inside the safe will begin to come together to form condensation.

And on top of that … the safe has a dark, cool interior which is great to the buildup of mold.

How does a Silica Dehumidifier Work?

Silica gel is a desiccant. Desiccants are substances that absorb and hold water from the air.

Silica (silicon dioxide – SiO2) has millions of tiny holes or ‘pores’ on its surface which attract and hold water. It happens a little like how rice absorbs water when you boil it – the water is sucked into the substance and held there indefinitely.

Silica gel can hold up to 40 percent of its weight in water. It can also reduce the relative humidity in a closed safe to 40 percent.

So, silica has come to be a very useful little substance for decreasing humidity in a closed space for a limited amount of time. We see silica packs sometimes in deliveries that turn up to our front door, for example, because the company wants to ensure you receive your product fresh, not damp!

How does silica change color?

It’s not the silica that changes color, it’s an additional substance used to help you know when it has reached its saturation point.

In blue silica packets, it’s cobalt chloride that is changing color. When it is saturated, it changes from blue to pink.

In orange silica packets, it’s methyl violet that changes color from orange to green. You’ll more commonly find blue silica packets as they are less toxic.

How do you recharge a silica dehumidifier?

One of the greatest things about silica gel is that it’s reusable.

To expel the moisture out of the silica, you usually simply need to heat it above 300 degrees Fahrenheit (150 degrees Celsius). There are three main methods to do this: place it in the microwave, place it in the oven, or plug it into a wall socket and heat it using its own internal heating pad. Make sure you follow the method prescribed by the product you purchase.

Each of these three methods are discussed in more detail below.

What we Look for in a Safe Dehumidifier

Strength – Measured by Cubic Feet

Most dehumidifiers provide a recommended cubic feet space in which the product will be effective. The cubic feet metric is an indicator of the strength of the product. The more cubic feet it can cover, the better it will be at absorbing moisture in a safe and keeping your valuables dry.

Recharging Method

There are three recharging methods for silica gel products. These are: wall socket recharge, oven recharge, and microwave recharge.

Wall Socket Recharge: These products come with their own internal heating element. When you plug it into the wall, the heating element heats up and expels that moisture from the silica gel so you can start the dehumidifying process all over again!

Oven Recharge: These products are placed in the oven and use the oven temperature to absorb the moisture. Note that you can’t throw any product into the oven. Oven rechargeable silica gel products don’t contain plastics or other substances that melt in the oven.

Microwave Recharge: This quick and dirty method is super convenient. 4 minutes at 600 Watts is usually sufficient to recharge the silica gel, but check your product’s advice. The main concern with this method is that you can overheat the product and cause damage to it.

Time between Charges

Most dehumidifiers have the same recommended time between charges of about 3 – 4 weeks. However, if you get a more powerful product and place it in a smaller confined space, chances are it’ll last a lot longer.

Size

A safe is usually quite small – so adding yet another item into the safe can be a burden. You could consider getting a hanging dehumidifier or one that mounts on the wall to save shelf space. The largest product on this list – the Pro Breeze Electric Mini Dehumidifier – is also the strongest, so if you have the space, it might be a good idea to get a larger one.

Final Thoughts

Our pick for the best safe dehumidifier is the Hornady Rechargeable Gun Safe Dehumidifier. We like that it comes with a wall mount so it doesn’t take up extra space, and it’s also a great thin shape for being inconspicuous. For all rechargeable dehumidifiers, you’ll need to keep in mind that you need to recharge them about once every 3 to 4 weeks (see the product manuals) to get the best value out of them and keep the safe from gathering moisture, mold and mildew.

We hope this review has been helpful. But remember, this article has shared our opinions and a range of examples for our circumstances only, and is based on our online research. It does not constitute advice, professional or otherwise. Your circumstances or experiences will differ from ours. Make sure you do your own research and due diligence and adhere to the rules laid out in our terms and conditions and disclaimer.