There is no hot water
The water pipe to water heater was broken due to frozen. It has been fixed but there is no hot water coming out. Ask the repairman and he said let the water run for a while, then there will be hot water, but it has been for 2 days already, there is still no hot water. What is the problem. Please help!
Thank you very much!
(I believe it is a gas water heater)