This publication provides introductory technical guidance for mechanical engineers and other professional engineers, construction managers and architects interested in design and construction of domestic water systems for hospitals and other medical facilities. Here is what is discussed: 1. GENERAL 2. DOMESTIC HOT WATER SYSTEMS 3. DEVICE CALIBRATION, 4. GENERAL PIPING DESIGN GUIDELINES, 5. INSPECTIONS AND WITNESS OF TESTS, 6. WATER DISTRIBUTION SYSTEMS, 7. WALL HYDRANTS, 8. COORDINATION 9. BACKFLOW PREVENTERS, 10. PRESSURE REDUCING VALVES, 11. DOMESTIC WATER BOOSTER SYSTEMS, 12. SOLAR DOMESTIC WATER HEATING