Ariston Immersion Heater A heating element is used to raise the temperature of the water within a cylinder. This water can then be used by the end user for heating radiators and domestic use. The element also enables the cylinder to maintain its temperature, meaning the hot water will remain at the set temperature until it is given further instructions by the user. See suitability below: Comfort STI 125 Protech Comfort STI 150 Protech Comfort STI 210 Protech Contract STD 125 Protech Contract STD 150 Protech Contract STD 210 Protech Contract STI 125L Contract STI 150L Contract STI 210L
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