G.A.S EC2 Thermostatic Fan Speed Controller with Balancer - Thermostatic Control Plus Built-In Balancing
Best for: growers running a matched intake and extraction EC fan pair who want automatic thermostatic speed control and negative pressure balancing from one compact unit.
Our thoughts
The EC2 sits neatly between the basic G.A.S EC controller and the more advanced EC5 - you get proper thermostatic control plus a built-in balancer, without paying for features like Reactive Temperature Technology you might not need. It's fan-powered, so there's no extra power brick to find room for. A sensible middle-ground pick if you've got two EC fans to tame.
The G.A.S EC2 is a thermostatic fan speed controller built for Systemair-compatible EC intake and extraction fans, made by Global Air Supplies. Set a target temperature and minimum/maximum speed limits with the control knobs, and the EC2 will ramp your fans up or down automatically to hold your grow room at that temperature using its inbuilt probe.
What sets the EC2 apart from the standard EC controller is the built-in fan balancer with an offset dial. This lets you fine-tune the difference in speed between your intake and outtake fan so you can dial in a slight negative pressure - the setting most growers want to stop smells escaping the room. Because it uses the fan's own Active Cable connection, no separate power supply is needed; plug it into any Systemair Vector or Revolution EC fan with a white active connector and it draws power straight from there.
How it compares
The EC2 is a step up from G.A.S's entry-level EC controller and a step below the EC5.
- Versus the standard G.A.S EC Fan Speed Controller: the EC2 adds full thermostatic control, not just manual speed knobs.
- Versus the G.A.S EC5: the EC5 adds Reactive Temperature Technology for faster response to temperature spikes; the EC2 sticks to straightforward thermostatic control at a lower price.
- Versus AC-only controllers like the Vortex Thermostatic Fan Speed Controller: the EC2 only works with EC fans, but EC fans themselves are more efficient than AC equivalents at matched airflow.
If you've already invested in EC fans and want thermostatic control with balancing built in, the EC2 covers the job without the premium price of a full multi-sensor system.
Usage guidance
Setup is plug and play once your fans are wired in.
Installation
Connect the EC2 to your intake and outtake EC fans using their Active Cables (white connectors). No mains power connection to the controller itself is required - it's powered through the fan link.
Setting the thermostat
Position the temperature probe centrally in your grow space, away from direct light or airflow from the fans, then set your target temperature and minimum/maximum fan speeds on the dials.
Balancing your fans
Use the offset control knob to bring your outtake fan slightly ahead of your intake, creating the negative pressure that keeps odours contained.
Technical specifications
- Control type: Thermostatic EC fan speed control with built-in balancer
- Manufacturer: Global Air Supplies (G.A.S UK)
- Power supply: Fan-powered via Active Cable - no separate PSU required
- Compatible fans: Systemair Vector/Revolution EC range fitted with white Active Cable connectors
- Outputs: 2 (intake and outtake)
- Sensor: Inbuilt temperature probe
- Balancing: Offset dial for negative pressure control
- Controls: Thermostat, min speed, max speed and offset dials
Who this is for
- Growers running a matched pair of EC intake/outtake fans who want thermostatic control
- Anyone needing built-in fan balancing without buying a separate balancer unit
- Growers who want automatic temperature response without the cost of a full multi-sensor climate controller
- Odour-conscious setups that rely on maintaining negative pressure
Best suited to single-tent or single-room setups using EC fans from the Systemair/G.A.S range.
Our take
The EC2 does exactly what a mid-range EC controller should - thermostatic control and balancing in one box, powered straight from the fan. It's not the fastest-reacting controller in the range, but for most single-room setups that's not what you need.
If you're running EC fans and want proper automatic control without paying EC5 money, this is the sensible pick. Does exactly what it should, day in, day out.
