The saswell T19WHB-7-RF-WIFI is a 2-channel Programmer, designed for control of both heating and stored hot water in complete systems. The heating and hot water programs are completely independent, to allow the system to be operated in the most energy-efficient manner possible. The saswell 2 Channel programmable room thermostat T19WHB-7-RF-WIFI lets you choose what times you want the heating to be on, and what temperature it should reach while it is on, allowing you to select different temperatures in your home at different times of the day (and days of the week) to meet your particular needs.