COMMERCIAL/HEAVY DUTY USE
For commercial/heavy duty installations with constant usage/reheat requirements or where an external
programmer designed for immersion heaters is not present then Titanium immersion heaters must be fitted
in order to comply with the warranty.
RECOMMENDED TEMPERATURE SETTINGS - IMMERSION HEATER
For domestic usage a temperature set of 55°C-60°C is the norm. This is above the growth temperature area
for Legionella and low enough to prevent nuisance tripping and unnecessary scaling.
THERMOSTAT OPERATION
The thermostat has an adjustable control operating between 20°C and 65°C. The usual desired domestic
setting is between 55°C and 60°C. The thermostat is supplied set at 60°C. For setting the stat, turn fully
clockwise to the maximum, and then anticlockwise (back off) approximately a quarter of its travel. Then
make minor adjustments to suit your personal taste.
THERMAL CUTOUT
If the cylinder begins to overheat (80°C), the thermal cut-out will activate, isolating both the live and neg-
ative connections within the immersion heater. This may also happen during a power spike. For resetting,
isolate the power supply and allow the cylinder to cool down. Remove the head cap and press the high limit
cut-out reset button on top of the thermostat. Should nuisance tripping occur, consult a qualified electrician
to investigate the power supply and/or the thermostat itself.
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REPLACEMENT IMMERSION HEATERS - ALL TYPES
Replacement immersion heaters are available in all formats for your water heater. These should be
obtained via ourselves to ensure the correct specification is supplied, and our warranty not
compromised. The standard heater has incoloy elements, a 1¾” BSP threaded head and standard rating
of 3kW at 240 volts. Check the label detail on the head before ordering, as alternative specifications are
available.
The ‘O’ ring on the head of the immersion heater should be correctly positioned and lubricated with a
WRAS approved silicon lubricant before fitting. Screw in by hand until almost sealed and then gently finish
tightening as the ‘O’ rings will seal easily. Remake the wiring connection as per instructions
provided.
INSULATION OF THE TEMPERATURE & PRESSURE RELIEF VALVE
Components for insulating the T&P are supplied in order to retain heat and energy. Installation instructions
are provided with the insulation cover.
DISCHARGE ARRANGEMENT
The diagram opposite was taken directly from UK government Building Regulations Part G: 2016.
This information is not exhaustive. If in doubt, seek advice. Full details of Building Regulation G3, is
available from: www.planningportal.gov.uk
The discharge from both the temperature, and expansion relief valves can be joined together via a 15mm
end feed tee. Water should only be discharged when there is a fault with the system, and be visible at the
tundish. (Consider a safety device to alert those of impaired vision or mobility when this occurs.)
Discharge water must not be allowed to collect in the pipe-work but rather flow freely to the tundish. This
should be vertically mounted, in a visible location, in the same space as the cylinder, and fitted as close as
possible within 600mm of the safety device (the relief valves). The discharge pipework must be in accord-
ance with Part G3 of the Building Regulations. These are as follows:
• The discharge pipe (D2) from the Tundish should have a vertical section of pipe 300mm long below the
Tundish before any elbows or bends in the pipework.
• This pipe should then be installed with a continuous fall of at least 1 in 200 thereafter.
WIRING - 3kW
Our 3kW immersion heaters MUST be wired in 2.5mm
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heat resistant cable, as failure to do so can cause
nuisance tripping. We will be unable to support your installation until this has been corrected. For
alternate higher wattage immersion heaters, consult the instructions supplied with the device.
