Does your pump pressurize the entire system? Or does it only pump to the tinaco and then use gravity from there?
When we have electricity, the pump pressurizes the entire system. If there is no electric, it's gravity feed at our house, because our pump is not hooked up to the inverter. Sometimes if it's cold and we want hot water, Mr. AE hooks the generator to the pump to pressurize - because the on-demand heater won't work on gravity feed.