These NEW stylish Black Robatherm Hot Water Urns will complement any Hot Drinks Station showing off your food and drinks. With the mode set to VARIABLE, the temperature can be controlled across a wide range via the graduated knob. Variable mode will suit those users who require warm or boiling water for their special application. Switching the mode selector to PRE-SET will fix the temperature at 95 C, the optimal temperature for most applications involving tea and coffee. Using pre-set mode offers a fast and easy setup, achieving consistent temperatures every time. Adjustment of the knob in preset mode has no effect on the temperature setting of the urn - it remains constant at nominal 95 C. This prevents continuous boiling and excessive consumption of energy.