get the Reefkeeper Lite from Digital Aquatics. It'll do a lot more than you need and only costs about $100. It comes with enough equipment to automate your heater as well as your lights. Then when you're ready you can always expand the system.
Steve My Old 180G Mixed Reef Currently: 120G Wavefront Mixed 29G Seahorse & Softies Running ReefAngel Plus x2 435-8
I used a old reef keeper set up awhile ago and it stuck on once lol, since then I use Ranco controllers for my heater. If you bought all the stuff I can wire it up for a back up heater and I can even wire it to average your sump temp and your display temp to have a more accurate temp. The nice thing with a "2 stage" heat set up is that if one heater dies on you, it will kick in the 2nd heater automatically. LMK This goes for anybody else to, I can buy them wholesale and I would wire them up for you for a frag or something!
I have a reef keeper lite that I bought for this reason (well this was one of the reasons). I have it controlling my heaters and fans. I havent had to worry about temp swings anymore which is nice and like Steve said it can do a lot more.
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