The best replacement for heat mat is ceramic bulb.

The best alternatives to heat mat are rated as following:
★★★★★  ceramic bulb
★★  heat rock
★  heat cable

Your alternative for heat mat is not listed? Suggest!
Speaking about heat mat, one probably shouldn't forget about ditra.

Other search terms related to heat mat and their ratings are:
★★★★★ ditra
You have in mind a companion for heat mat and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of heat mat in all years. Click on graph for more.
heat mat
ceramic bulb
heat rock