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LuxPro PSM010 Heat Only Mercury Free Round Thermostat Replace your old round thermostat with this backlit mercury-free model. Push Button Backlight Needs No Batteries Mercury Free Soft Rubber Set Temperature Ring Large Easy to Use Mode Switch Easy Installation Compatible With: Most 24V Heating Systems 1 Stage Heat Only Gas, Oil, or Electric Systems 2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator) SPECIFICATIONS: Electrical Ratings: 1 AMP max per terminal, 24VAC (30 VAC max) - Anticipator Range - .018 - 1.0 AMPS Temperature Control Range: 45 to 90 Terminals - RH, W Dimensions - 3-3/4" in diameter