• Temperature & Humidity Sensors
• Eliminate Mould & Fungus
• Full Grow Room Automation 
• Control Via App or Panel 
• Plug & Play Simplicity
• Stage-Based Grow Automation 
• Master Your Climate
• Up to 12 Litres per Day 
  
• Four Operating Modes
  

Master Your Climate. All year round.

There are two types of indoor growers in this world. Those who obsess over humidity… and those who eventually learn to obsess over humidity. The Mars Hydro Smart Dehumidifier exists firmly for both camps, offering a calm, clever and deeply competent solution to one of indoor growing’s least glamorous but most critical problems: too much moisture hanging about like an uninvited guest who refuses to leave.

Available either as a standalone unit or paired with the Mars Hydro iControl Smart Grow Room Controller, this is not just a box that removes water from the air. It’s a purpose-built climate tool designed specifically for grow tents - and that distinction matters more than you might think.

Designed For Grow Tents.

Let’s start with intent. Unlike generic household dehumidifiers - which are about as subtle as a vacuum cleaner at midnight - this Mars Hydro unit is engineered specifically for enclosed grow environments. Tents, cabinets, compact rooms. Places where airflow is limited, humidity fluctuates wildly, and precision is everything.

With a maximum dehumidification capacity of 12 litres per day, this unit is perfectly sized for tents up to 5×5 ft (150×150 cm). That’s the sweet spot: powerful enough to control moisture properly, without overpowering the space or stripping humidity too aggressively.

It also comes equipped with its own temperature and humidity sensor, allowing it to respond intelligently to environmental changes rather than simply blasting away blindly.

Impressive Smart Control.

On its own, the Mars Hydro dehumidifier is a very capable piece of kit. But pair it with the Mars Hydro iControl Controller, and things get properly interesting.

Using a simple RJ12 cable connection, the dehumidifier integrates into Mars Hydro’s wider smart ecosystem. Lights, fans, sensors - all talking to each other, all sharing data, all adjusting automatically to maintain stable conditions.

Humidity rises? The dehumidifier reacts. Temperature shifts? Fans and extraction respond. VPD drifts out of range? The system quietly corrects itself.

Once connected via the MarsPro App (Bluetooth or Wi-Fi), you can monitor real-time data, set schedules, define humidity targets and create automated “scenes” for different growth stages - all from your phone. Manual adjustment becomes optional. Consistency becomes effortless.

Click here for a closer look at this amazing little gadget. 

Four Operating Modes. Zero Nonsense.

This isn’t a one-button appliance. The Mars Hydro Smart Dehumidifier offers four intelligent working modes, each with a clear purpose:

HOLD Mode
Set your target humidity and let the unit maintain it automatically. This is the everyday workhorse mode - stable, predictable and ideal for long-term use.

CONT Mode
Full-power continuous dehumidification. Perfect for sudden humidity spikes or high-moisture periods when you need fast results and no excuses.

DRY Mode
Designed for drying enclosed spaces efficiently. Useful post-harvest or anywhere moisture needs to disappear quickly without drama.

FAN Mode
Air circulation only. No dehumidification, minimal energy use, and ideal for improving airflow inside the tent.

Each mode does exactly what it says it will - which is surprisingly refreshing.

Thoughtful Engineering. Precision Growing.

Mars Hydro hasn’t cut corners here. The 2.1-litre water tank is easy to remove and empty, while the included 150cm drain hose allows for continuous, hands-free operation if you prefer. Two drainage options. No compromises.

The unit ships with two flexible air ducts (long and short), allowing you to direct airflow precisely where it’s needed - a small detail that makes a big difference in tight tent environments.

Noise levels are modest, energy consumption is sensible, and the unit integrates neatly into existing setups without demanding rearrangement or rewiring.

 

A Giant Leap Forward.

This dehumidifier is officially compatible with a wide range of tent sizes, from compact 60×60 cm setups right up to 150×150 cm, and it performs reliably across all of them - provided, as always, that basic airflow and temperature management are in place.

It’s particularly effective during night cycles, when humidity naturally rises and lesser setups start to struggle. Left unattended, moisture becomes a problem. With this system, it becomes background noise.

A Genuine Game Changer.

The Mars Hydro Smart Dehumidifier is not flashy. It doesn’t shout. It doesn’t pretend to be something it’s not. What it does instead is quietly, efficiently and intelligently solve one of the most persistent challenges in indoor growing.

On its own, it’s a well-designed, grow-tent-optimised dehumidifier with excellent performance. Paired with the iControl system, it becomes part of a genuinely smart, automated climate solution that saves time, reduces risk and improves consistency.

In short:
Less stress.
Better control.
Healthier environments.

And once you’ve used a setup like this, going back to manual humidity control feels like winding your windows down by hand. 

Dehumidifier includes:

• 1 x Dehumidifier(with power Cord)
• 1 x Flexible Long Air Duct(30.5cm)
  
• 1x Flexible Short Air Duct(22cm)
• 1x Drain Pipe (150cm)
• 1x Temp &Humidity Sensor

*Approximate costs of use based on 75% power for a 12 / 12 flowering cycle. 

*Calculated using the UK: Energy Price Guarantee (January 2026) electricity rate of 28.00 pence per kWh.