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OK then, if your hours are irregular, leave your hot water switched on constantly.... as you use the water the themostat will cause the boiler to heat the water while you are using it.... If you have solar thermal then you should have the largest cylinder that you can physically fit to store as much heat as possible... What size cylinder are you having fitted?
300lt, be good to use all the hot water up in the morning so the sun can heat it up in the day which is why I don't want to have the water on constantly.
Well have the heating on fixed times and be more regular or ask your installer to fit a timer with a one hour boost button.... Or have two cylinders fitted to make sure that you don't run out of hot water..... You are using 300 litres? what are you washing.....Livestock??