Quooker offers two different types of tank. The PRO-VAQ series, available in 3 sizes, gives instant boiling water. The 3 litre PRO3-VAQ will suit the majority of households, but very large families or semi-professional cooks may want the 7 litre PRO7-VAQ. The 11 litre PRO11-VAQ is designed specifically to meet the needs of commercial and professional users such as hotels, catering companies and offices. The COMBI tank is a single tank which handles all your kitchen hot water needs as well as providing boiling water. If your kitchen tap is more than 6 metres away from your boiler, a COMBI tank under your kitchen sink could offer you significant savings in both water and energy useage. If you require the PRO11-VAQ please call us (0808-1152442).