` The clips are press-on. The connection at the clips is subject to oxidization and physical pressure/movement which causes resistance to current flow. This resistance causes heat build up, at that spot. Enough of that, and you have a fire. Soldering, well done, is much more permanent, which is much safer. Heat tape is only as safe, or dangerous, as you make it, and it ( and any heat source ) can be very dangerous, if it's hamboned.
` I use a temperature probed thermostat, then a rheostat set to 88 degrees( depending on species ), for each of my heat tape heat sources. The thermostats are $30., and each rheostat costs less than $10 to build. Cheap precautions to avoid cooking pets, or burning the house down.
` A non-contact IR thermometer is a cheap, and invaluable aid in setting up, and monitoring heat tape and floor temperature.
` Good Luck!
`
` Pot=bellied Anaconda.

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