Danfoss CET B-RF User & Installation Instructions Manual page 18

What is a cylinder thermostat?
... an explanation for householders
A cylinder thermostat switches on and off the heat supply from
the boiler to the hot-water cylinder. It works by sensing the
temperature of the water inside the cylinder, switching on the
water heating when the temperature falls below the thermostat
setting, and switching it off once this set temperature has been
reached.
Turning a cylinder thermostat to a higher setting will not make
the water heat up any faster. How quickly the water heats up
depends on the design of the heating system, for example, the
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