The open vented design of the SNU 5 and SNU 10 single point of use compact storage water heater requires the use of one of the four styles of STIEBEL ELTRON taps to be fitted with these products. The MESG is a gooseneck single lever sink mixer. The MESG sink mixer is rated with a three star WELS rating and has a maximum flow rate of 8 litres per minute.