Zoo Med ReptiTherm Under Tank Heater, Medium

Stays nice and hot, no issues there. Problem is the adhesive is not strong enough to keep it stuck on the bottom of the tank when the mat warps from heat about a year in. Dont have a lot of options so this may be as good as it gets... Note: for new reptile owners, you WILL need to buy a thermostat for this to control temperature, it gets hot! Up to 130F easily.

On the end where the cord/box are it does not like to stay adhered to my tank but it works for what I bought it for which is keeping my Bearded Dragons tank at 70 degrees at all times.

Easy to set up, does it’s job and my gecko is happy. Make sure you have a thermostat with this! Zoomed is a great brand.