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Comming from a farm, I have been bourght up to catch rainwater, drink it and run the whole house on it. Hot water systems last a lot longer on rain water than mains. The main house on the farm was built in 1963 and still has the original hot water system, due to running 100% on rain water. Just another benefit from catching rainwater.
My present house just out of city has rain water storage of 22,000 and 5,600 gallon tanks; x 4.5 = 124,200 litres.
I am sure those that have been use to rain water, would think it a backward step to be 100% dependant on the mains.
All the best.
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