Heatmiser PRT-E, Operating Instructions Manual

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What is a programmable room thermostat ?
A programmable room thermostat is both a programmer and a room
thermostat. A programmer allows you to set On and "Off time peri-
ods to suit your own lifestyle. A room thermostat works by sensing
the air temperature, switching on the heating when the air tempera-
ture falls below the thermostat setting, and switching it off once this
set temperature has been reached.
So, a programmable room thermostat lets you choose what times
you want the heating to be on, and what temperature it should
reach while it is on. It will allow you to select different temperatures
in your home at different times of the day (and days of the week) to
meet your particular needs.
Turning a programmable room thermostat to a higher setting will not
make the room heat up any faster. How quickly the room heats up
depends on the design of the heating system, for example, the size
of the boiler and radiators.
Neither does the setting effect how quickly the room cools down.
Turning a programmable room thermostat to a lower setting will
result in the room being controlled at a lower temperature, and
saves energy.