Hi my home water heat some how not working, half of my house is dont have hot water, and other half is having hot water. I think 8 month ago we have same problem, and this guy coming over and he use some kind of lighter and light something on the water heat thing, it take him like 1 min to make the water heat work again. and he charger us $85 dollar, now it happent again, any one have any ideal what going on ? thanks !