I had two 300 watt titanium via aqua heaters that had the controllers go bad on. So I cut the controllers off and and just attached a plug. Then hooked them up to an STC-1000 controller. It's been running for over two years with no issues.
http://www.aliexpress.com/store/product/temperature-controller-STC-1000/1305777_2004466302.html
A lot of home brewers use them, and the only failures I've read about come from people using cheap knock offs, or using too small a gauge of wire.

http://www.aliexpress.com/store/product/temperature-controller-STC-1000/1305777_2004466302.html
A lot of home brewers use them, and the only failures I've read about come from people using cheap knock offs, or using too small a gauge of wire.
