Resideo (Honeywell Home) TH1100DH 1004 24V digital thermostat, heat only, horizontal-is OBSOLETE
Resideo (Honeywell Home) TH1100DH 1004 Pro 1000 horizontal digital thermostat, 24V or millivolt single-stage heat only applications, non-programmable, 40-90F, backlit display is obsolete. It is replaced by Honeywell TH1110U4000
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This is an official Resideo (Honeywell Home) replacement part
Honeywell TH1100DH 1004 Pro 1000 horizontal digital thermostat, 24V or millivolt single-stage heat only applications, non-programmable, 40-90F, backlit display