Spoke to a mate his a plumber and he told me solar is ok but not what everyone thinks. Works fine through the day but on overcast days and at night if the water isn't up to temp the thermostat kicks in and that's when the cost start going up without people realising why. He said the best why is continuous flow cost affective and cheaper to run. You have instant, Made my mind up continuous flow it is. Just hope my system last another month so I can get it after tax time. Afternoon all, had a good day?