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DIY Solar Water Heater. A Homemade "flat panel" COPPER COIL Solar Water Heater. Easy DIY. Full Instructions. super hot temps (sustained at 165F+). fast hot water. no electricity needed. easily hooks up to standard water tap/garden hose. reaches temps well over 150F (water pasteurization temp) so it works to clear/kill any pathogens (if a non-municipal source is used). it's super portable so it's good for camping/off-grid/emergency as well as everyday use. couple of notes: water flow rate