Hi Ron,. I have used soil warming cable for years never had a problem I use a old vivarium with a plastic cover with 2air vents on the top it is 30 watts 240 volts , I fill 1inch of sand then run the cable rouund leaving a 2inch space between the cable then another 2inch of sand on top and carry on running the cable round till it is all used up, no thermostat is needed as it is only. A soil warming cable, not a 2bar electric fire, will germinate seeds and can lgrow too 4 inch tall, but you only have 8 hours of daylight now so that's another problem
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