Hi all. 1st post here.

I just watched Richard Trethewy install a whole house water filtration system. I must have missed somthing.
He cut the line from the street into the house, then cut the line going into the house which I presumed just took a left and went to the water heater cold inlet side.

He said nothing about draining the water heater. How can he cut the line into the water heater with out pressurized water erupting from that line. That line from the street does go straight to the hot water heater cold inlet side doesn't it???