Best budget thermostat for hatchling leopard gecko

Reptile welfare is almost entirely determined by getting the environment right — temperature gradient, UV lighting, humidity, and substrate all need to match your species' natural habitat. Get it wrong and you're looking at chronic stress, poor feeding, and illness that's hard to reverse. For a hatchling especially, that foundation matters from day one. So — leopard gecko, which is a great starting point — how old is the hatchling, and is it the thermostat specifically you're trying to sort, or is there more of the setup still to get right?

Good that you're making this move — a dimmer switch gives you no feedback from the actual surface temperature, so you're essentially flying blind. Heat mats without a thermostat are one of the most common causes of burns in hatchling leos, and at that age they're less able to thermoregulate to compensate. Your £20 budget is actually workable here. What I'd recommend is the Inkbird ITC-306T — it's a mat-compatible pulse thermostat that lets you set a target temperature and actually holds it. You probe it at the warm-side substrate surface, set around 30–32°C for the warm end, and it does the rest. It's routinely available on Amazon UK for £16–20 depending on timing. Not fancy, but it does the job reliably and it's widely used in the hobby. Is she eating consistently so far?

That's a good sign — slow starts in week one are normal, especially with the stress of being moved. As long as she's eating now and the temps are correct, she should settle in well. One thing to check once you get the Inkbird set up: place the probe directly on the substrate surface at the warm end, not on the glass floor of the tank itself. Glass reads hotter than the surface your gecko actually sits on, so probing the glass will cause the thermostat to cut the mat too early and leave the surface cooler than you think. Aim for 30–32°C at substrate level on the warm side, and make sure the cool end is genuinely unheated — leos need to move away from the heat when they want to. Does the cool end of her tank have somewhere she can hide too?

That's a really solid setup for a hatchling — the three-hide system is exactly right, and having the humid hide sorted early is particularly important because hatchlings shed frequently. The Inkbird ITC-306T will slot straight into what you've already got. To recap: it plugs in-line between the mat and the socket, probe goes on the warm-side substrate, set the target to 31°C and the variance to around 1°C either side. That gives her a stable, consistent warm zone without any risk of overheating. At that price point it's genuinely the right tool for the job — nothing budget about the outcome.

Great — once it arrives, give it 24 hours to run and stabilise before you rely on the reading, and spot-check with a temperature gun if you have one. If she's eating, hiding in the right spots, and her shed comes off in one piece, you'll know the environment is dialled in. Any questions once you've got it set up, come back.