Which thermostat models are compatible with 750 millivolt systems such as a fireplace?
Honeywell offers a variety of thermostats that are capable of working with 750 MV heating systems such as fireplaces. Typically these models are battery powered. Thermostats you find at the retail store will indicate on their packaging whether or not it will work with these type of systems. If you’ve already purchased a thermostat and discarded the package, check the thermostat literature to verify compatibility with millivolt systems.
Why is my TH1100DH/TH1110DH/TH1210DH showing an error message E1? What does it mean?
E1 = Replace the thermostat
Standard Millivolt Heat Manual Thermostat
|Thermostat Type||Mechanical, Non programmable|
|For Use With||Heat only systems|
|Includes||Thermostat, Wall Anchors, Screws, Wire Labels|
|Program Modes||Manual / Not Programmed|
|Product Height||4.75 in|
|Product Length||2.8 in|
|Product Width||1.38 in|
|Control Functions||Heating, Cooling|
Owner’s Manual [pdf]: CT50 Series Thermostat