Quote Originally Posted by mdfreak2 View Post
ok im running 2 Hydrofarm MTPRTC Digital Thermostat For Heat Mats the reason im running 2 is the first 1 i bought didnt stay programed so they sent me another to replace that one and a couple days later i recieved another one. they work fine its the turn on heat up to the set temp then turn off and drop back down below the temp i set it for then turn back on. i wasnt sure if they all were like that or if they would stay at the programmed temp at all times thank you.
All the on off units work like this the johnson and ranco (VE too I think) have a 1º over and under unlike the hydrofarms 3º. Proportional will deliver little variation if set up for the conditions you have.