The aim of this study is to develop the concept, size, and analyse the performance of a proposed standalone solar power-driven system for pumping groundwater at remote communities of the Egyptian oases to be used in irrigation, and pasteurising a fraction of pumped water for domestic use (domestic hot water as well as cold water). A transient model is built on TRNSYS® for simulating the key variables of the pasteuriser throughout the year with predetermined loads. El-Kharga oasis, located in the Egyptian part of the Sahara Desert, has been considered as a case study. Glazed flat plate collectors and poly-crystalline PV’s has been optimised to a tilt angle of 27 degrees (oriented due South) and a feedwater heat exchanger has been used to warm up the feedwater while cooling half of the pasteurised water. The results provided here are based on a community of 40 single-family houses; each family of 5 people. A preliminary cost analysis showed that the proposed system is more efficient than a traditional electricity-driven system.