For 99% of the time, when our hot water tank technician present you with a quoted price, that will be the amount that you pay. Everyone of our hot water tank technicians try and make the best judgement as to what the final outcome will be. But, there are times that secondary components break or are unforseen while completing the original repair. If this situation was to arise, the hot water tank technician would stop working and immediately discuss the new problem with you.