Reptile Systems Dimming Thermostat 400w

The Reptile Systems Dimming Thermostat 400w is an analogue dimming thermostat designed for keepers who need stable, consistent heat control across vivarium, terrarium, and aquatic setups. Rather than cycling power on and off like a basic on/off thermostat, it modulates electrical flow to the heating element — keeping temperatures steady rather than oscillating around a set point.

How Dimming Works

On/off thermostats cut power completely when the target temperature is reached, then restore it fully when temps drop — a cycle that causes fluctuation. A dimming thermostat reduces power incrementally as the set temperature is approached, holding output at whatever level is needed to maintain that point. The result is a more stable thermal environment, which is particularly important for species sensitive to temperature swings.

Compatible Environments

This thermostat is rated for use in both reptile enclosures and freshwater or saltwater aquariums, making it a versatile choice across the vivarium and aquatics hobby. It is well suited to larger aquariums, indoor ponds, and terrestrial or tropical terrarium builds where reliable background heat is required.

Specifications

• Maximum load: 400w
• Supply: 240v / 50hz
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• Suitable for reptile vivariums and fresh or saltwater fish tanks
• 2-year warranty

For keepers running mid-to-high wattage heating in a reptile or aquatic setup, the Reptile Systems Dimming Thermostat 400w delivers dependable analogue control backed by a manufacturer warranty — straightforward to set up, and built to run consistently over the long term.

• Free delivery to UK mainland addresses on orders over £79.
• In-stock items ordered before 12pm Monday to Friday usually ship the same day.
• Standard vivariums go free next working day; the largest sizes travel by pallet.
• Live animals and custom vivariums have a £50 delivery charge. Custom vivariums take approximately 2 to 4 weeks to build.

Delivery policy30 day returns