I bet my setup using quad ranco etc 111000 is safer than a single herpstat or a single helix.
ARS rack, two 6" wide heaters, each on a different dual ranco thermostat. 33" deep tubs.
1 ranco goes hot, the second ranco kicks in and regulates it.
One ranco goes cold, they still have the other heat tape and pair or thermostats.
1 section of heat tape fails, I have the other.
Can it fail? Of course.
Is it safe. In my opinion, yes.
Do I have spares? Yes.

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• Is a proportional thermostat safer? - rudykirk, Sat Oct 4 16:06:00 2008
• Absolutely!!!! - rainbowsrus, Sun Oct 5 00:30:06 2008
• RE: Absolutely!!!! - Bighurt, Sun Oct 5 12:43:25 2008
• RE: Absolutely!!!! - caz223, Mon Oct 6 01:31:08 2008
• RE: Absolutely!!!! - BobS, Mon Oct 6 11:15:29 2008
• Solid state components fail too! - caz223, Mon Oct 6 11:40:56 2008
• RE: Solid state components fail too! - BobS, Mon Oct 6 12:06:07 2008
• RE: Absolutely!!!! - caz223, Mon Oct 6 12:57:50 2008
• UPS ?......... - BobS, Mon Oct 6 13:28:40 2008
• Uninterrupted Power Supply - Bighurt, Mon Oct 6 17:28:42 2008
• Thanks np - BobS, Mon Oct 6 20:56:45 2008
• ARS racks - caz223, Mon Oct 6 22:02:53 2008
• RE: Nice responses - markg, Mon Oct 6 13:45:46 2008
• More.... - rainbowsrus, Mon Oct 6 17:34:29 2008
• RE: More.... - caz223, Mon Oct 6 22:28:52 2008
• RE: Rule of thumb - markg, Mon Oct 6 13:58:01 2008
• RE: Rule of thumb - caz223, Mon Oct 6 22:36:26 2008
• RE: Rule of thumb - caz223, Mon Oct 6 22:58:32 2008
• kill-a-watt - caz223, Mon Oct 6 23:04:46 2008
• They call them dimmer switches.... - caz223, Mon Oct 6 23:20:44 2008
• RE: They call them dimmer switches.... - markg, Tue Oct 7 12:39:07 2008