Well, any heat source needs to be controlled by a heat controlling device such as a rheostat or thermostat that you can buy from a place like: www.bigappleherp.com Then, with the use of one of those, the answer to that question would be no, they are not too hot. BUT, withOUT the use of one of those temperature controllers, then yes, a UTH or heating pad would get way too hot to use (over 100F).

Jennifer