Timeguard TRT044 User Manual

Cylinder/Pipe

Thermostat

Cat. No. TRT044

Operating & Installation Instructions

80

70

1

C

2

60

50

40

°C

What is a cylinder thermostat?

1

C

2

...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 size of boiler and
the heat exchanger inside the cylinder.

The water heating will not work if a
time switch or programmer has switched
it off. And the cylinder thermostat will
not always switch the boiler off,
because the boiler sometimes
needs to heat the radiators.

Cylinder thermostats are usually fitted
between one quarter and one third of the
way up the cylinder. The cylinder thermostat
will have a temperature scale marked on it,
and it should be set at between 60ºC and
65ºC, then left to do its job. This temperature
is high enough to kill off harmful bacteria
in the water, but raising the temperature
of the stored hot water any higher will
result in wasted energy and increase
the risk of scalding.

If you have a boiler control thermostat,
it should always be set to a higher
temperature than that of the cylinder
thermostat. In most boilers, a single boiler
thermostat controls the temperature of
water sent to both the cylinder and

radiators, although in some there are

two separate boiler thermostats.

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