NOTE: Only the correct immersion heater containing a safety
overheat thermostat may be used for replacement.
Applications
The Glow-worm cylinder can be connected to any UK
standard boiler.
Typical applications
Single bathroom property:
Glow-worm cylinder SS 115
Single bathroom property with an en-suite shower room:
Glow-worm cylinder SS 115 / SS 150
Two bathroom property:
Glow-worm cylinder SS 150 / SS 175
Two bathroom property with an en-suite shower room:
Glow-worm cylinder SS 175 / SS 200
Larger properties:
Glow-worm cylinder SS 250 / SS 300
Commercial use: size depending upon hot water
requirements.
NOTE 1: Select the appropriate boiler to match the heating
load (with the normal allowance for heating up from cold)
plus an allowance for heating the hot water cylinder. Typically
it is practice to allow an additional 2-3 kW for the hot water
production.
NOTE 2: Consideration should be given to the use of a larger
size of cylinder than shown above where high water demands
are likely.
The Glow-worm range of unvented hot water storage
cylinders are indirectly heated cylinders which are designed
for use with UK standard boilers in hot water supply systems.
Glow-worm cylinders are available in six sizes; 115, 150, 175,
200, 250 and 300 litre.
The cylinders are of stainless steel construction, insulated
with EPS and enclosed in a decorative casing. They are
supplied with all necessary cold and hot water controls and a
2 port valve for control of domestic hot water.
The Glow-worm cylinders operate using a mains water
pressure supply and do not require a feed from a cold water
storage tank. The Glow-worm cylinders have 22 mm DHW
outlet and cold water mains inlet connections for optimum ow
rate. To achieve optimum performance from the Glow-worm
cylinder an adequate cold water mains supply pressure and
ow rate must be available (see section 4.2: Mains Water
pressure).
DHW Temperature Control
The Glow-worm cylinder is supplied tted with an adjustable
domestic hot water (DHW) thermostat with thermal cut-
out and manual reset button which controls, via a 2 port
motorised valve, the temperature of the water in the Glow-
worm cylinder.
The external electrical controls should be wired to the 2 port
valve and cylinder thermostat in the normal way, as shown in
the section Electrical Connections and Controls.
CH Control
Central heating is controlled by a separate 2 port valve
in conjunction with suitable external controls, such as a
programmer, room thermostat and thermostatic radiator
valves.
Immersion Heater
Glow-worm cylinders are also provided with an auxiliary back
up 3 kW electric immersion heater, including an adjustable
thermostat, thermal cut-out and manual reset button and are
tted behind the front panel.
Testing and Certication
This product has been assessed and complies with the
requirements of the Building Regulations for unvented hot
water storage systems and must not be altered or modied in
any way.
Any alteration not approved by Glow-worm, could invalidate
the certication, warranty and may also infringe the current
issue of the Statutory Requirements.
WARNING: We cannot accept responsibility for any damage
which may occur as a result of non-observance of these
instructions.
Subject to alteration.
Spare Parts
IMPORTANT: Use only genuine spare parts supplied by
Glow-worm.
Testing and Certication
Design Description
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