it's sunday and plumbing supply places and plumbers are closed and i installed a new hot water heater. all water connections correct. yes the inlet connector goes to the cold nipple of the water heater. purged atr from system by leaving all hot water faucets on, running cold water for awhile and then filling up tank. instructions said that once the water heater is completely filled the water will come out of hot water faucetts at normal pressure which it did. i turned off all faucetts but the water is coming out thry the top hot water connection to the drain under the house!!! i haven't fired up the burner yet until i solve this water flow problem. any plumbers out here??? I thought the water should not go thru the hot water out pipe except when a hot water faucett is on like before with the old one. instead it is going to the drain pipe under the house. the same one that the pressure valve pipe from the water heater goes to i believe. i checked the pressure valve operation and i think it works properly. there was no outflow from it unless i opened it. any help would be appreciated. p.s. i googled the problem , checked utube and diy too and can't find this problem anywhere.