We have a new 50 gallon gas hot water tank
Just got installed
I checked all connection with the maul looks good

We are getting no hot water to any of the faucet - just cool water
As all as we have no pressure coming to the hot water faucet

Is there a valve that got left closed?
Is the waterheater heating water?
You should feel heat on the top of the heater?

Open the drain spigot and tell us if you get hot water under pressure. I think something has been left closed like the previous poster also suspects.