I got a 1250R from G.Q.F. Manufacturing. It isn't listed on their website www.gqfmfg.com. But if you don't know much about electrical wiring you may be better off going with the 1550R as it is all digital control with a wafer type back up. The 1250R uses two wafer t-stat elements which for me was the way I wanted to go as I replace both of them with 2 Rancos and then added a third Ranco for additional protection.