Traditonal thermostats are simply set by a dial.
Digital thermostats offer a digital display for current and set-point temperatures.
Programmable thermostats are a thermostat and timeswitch in one unit.
Thermostats that can control heating and or hot water via the internet.
Frost thermostats are used to protect boilers, pipes and other components against frost.
Thermostats for your hot water cylinder or pipe.