Rheem New Zealand manufactures a range of Zip overbench product that is filled and switched manually. The unit is filled via an appropriate valve until the required level is reached as viewed in the gauge glass. To boil the water, simply press the manual start switch. The unit will automatically switch off once the water has boiled. Zip units have delivered boiling water tirelessly throughout New Zealand for generations. They are an ideal and economical option for church halls, clubs and factories or anywhere boiling water is required infrequently. Today the Zip product is available in 5 sizes from 4.5 litres to 34 litres.