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zref:shw:start [2025/10/08 00:54] – [ROI Notes] Alan Sheazref:shw:start [2025/10/08 00:54] (current) – [ROI Notes] Alan Shea
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 ====ROI Notes== ====ROI Notes==
-Without installing water and electric meters on each hot water heater it is difficult to estimate actual cost and savings of heating water.((Adding an electric meter would cost about $70 each, and a hot water meter would cost about $200 each.)) The water heaters are high efficiency and are well-insulated(([[https://www.rheem.com/marathon/|Marathon by Rheem]])), and would preserve solar heated water for long periods (24 hours or more). Assuming that the solar panels heat the water significantly above the thermostat setting (they are capable of heating water to about 180F((Temperature valves are included to prevent scalding))), the thermostat may not switch on the electric heater for many hours after the solar panels are no longer collecting heat, even with moderate hot water use. +Without installing water and electric meters on each hot water heater it is difficult to estimate actual cost and savings of heating water.((Adding an electric meter would cost about $70 each, and a hot water meter would cost about $200 each.)) The water heaters are high efficiency and are well-insulated(([[https://www.rheem.com/marathon/|Rheem Marathon water heaters]])), and would preserve solar heated water for long periods (24 hours or more). Assuming that the solar panels heat the water significantly above the thermostat setting (they are capable of heating water to about 180F((Temperature valves are included to prevent scalding))), the thermostat may not switch on the electric heater for many hours after the solar panels are no longer collecting heat, even with moderate hot water use. 
  
 The largest user of hot water is the hospital laundry; as such it may be worth installing two systems on that water heater -- one on the east side to capture morning sun, and one on the west side to capture afternoon sun.  The largest user of hot water is the hospital laundry; as such it may be worth installing two systems on that water heater -- one on the east side to capture morning sun, and one on the west side to capture afternoon sun. 
zref/shw/start.1759884850.txt.gz · Last modified: by Alan Shea

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