Vaillant TURBOmax VUW 242 E Instructions For Use Manual page 9

Obtaining hot water
On opening a hot water tap @ at a supply point (basin, shower, bath, etc.) the boiler
will operate automatically to provide hot water. (A short deloy may be experienced in
obtaining hot water at the tap, depending on the length of pipework and your system
layout. This delay can be reduced by not fully opening the tap until the water is flowing
at the desired temperature).
With the tap fully open you will receive the maximum flow rate of hot water. Should
you require hotter water reduce the flow by partially closing the tap.
On c1asing the tap the boiler automatically switches off (or continues to operate for
central heating if required). The pump may coniinue to operate for a short
period.