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New thermostat

kingerna1 Member Posts: 4
I wonder if someone can recommend me a new thermostat. Something cheap that I can just order online? I have a new wells mclain ultra indirect hotwater tank and the thermostat has givin me problems from the beginning. It would pop up err and i would need to reset power for it to restart but now just sits in err. This is a pic of the connections if someone could recommend me one I could order to replace? so much appreciated!