This simple-looking yellow plug could save you a whole lot of heartache and a few dollars, too.
Inside the plastic plug is a thermostatic control that clicks on at 38 degrees and clicks off at 50 degrees. Plug your pipe's heating cables into the device, and you won't have to worry about waking up to frozen (and busted) water pipes.
The plug can be a real pipe saver in vacation homes, and can also used with other devices such as electric space heaters.