Horstmann Centaur tc7 is a user-friendly electronic central heating and hot water programmer that offers precise control over your home's temperature. Program up to three on and off periods every 24 hours, with different schedules for weekdays and weekends. Override options include AUTO, ALL DAY, 24 HRS, OFF, and WEEKEND LOCK. Choose between HOT WATER ONLY or HOT WATER AND CENTRAL HEATING modes. Utilize the ADVANCE button for instant switching and the BOOST button for a one-hour boost whenever needed.