I have seven 10-gallon tanks set up for my geckos and use UTH. I use the size made for 10-20 gallons. I started freaking out too when I plugged them in and the temps got up to 100+. But that is only the temp of the sand. What you should be concerned about is the ambient (the surrounding air) temp. Take a food dish or some other sort of item to set the thermometer on top of, at least an inch or more off of the ground to get the correct reading of the ambient temp. I find that the temp can be anywhere from 10-20 degrees different depending on the type of substrate you use. Hope this helps!
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1.1 Albino Burmese Python (Loki & Eris)

0.1 Normal Leopard Gecko (Aurora)

1.0 High Yellow Leopard Gecko (Orion)

0.2 Blizzard Leopard Gecko (? & ?)

0.1 Albino Tangerine Tremper (Semele)

1.0 Albino Tangerine Rainwater (Zephyr)

1.0 Albino Rainwater (Adonis)

0.0.0 Bearded Dragon (Norbert)

2.3 Fancy Rat (John, Herbert, Artemis, Callisto & Echo)

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• Heat problem using UTH - purdaddy, Wed Jan 7 11:27:14 2004
• RE: Heat problem using UTH - frostfire, Wed Jan 7 11:39:42 2004
• Sand/substrate temp is most important IMO - StarGecko, Wed Jan 7 12:11:23 2004
• Agreed np - KelliH, Wed Jan 7 12:46:07 2004
• You need a thermostat.. - KelliH, Wed Jan 7 11:41:13 2004
• RE: You need a thermostat.. - purdaddy, Wed Jan 7 11:58:43 2004
• RE: You need a thermostat.. - eternal, Wed Jan 7 12:14:56 2004
• Thanks so much!! A rheostat...That's what I'm needing...... - purdaddy, Wed Jan 7 12:26:27 2004
• RE: Thanks so much!! A rheostat...That's what I'm needing...... - StarGecko, Wed Jan 7 12:29:01 2004
• Yes, a rheostat will work but a thermostat is best..np - KelliH, Wed Jan 7 12:47:38 2004
• RE: You need a thermostat.. - StarGecko, Wed Jan 7 12:17:34 2004
• A thermostat, not a thermometer.. - KelliH, Wed Jan 7 12:44:36 2004