i believe that the real problem is > The Distance. The hot water has to travel too far from the heater> Solution > in the attic> go to the furthest hot water fixture and cut a tee in the hot water pipe > return that pipe back to the bottom of the water heater > you have to remove the drain valve> install a 3/4 short(brass) nipple ,Tee> Purchase a very small recirculating pump and install it so that it returns the water to the heater. BETTER CALL A PLUMBER.
