Just moved into a mobile with a Rheem 72- 40- 1 water heater. The piping on the side looks good, but there is an opening in the top that looks like it is supposed to have a pipe. It is wet. Is the uni

SOURCE: Rheem 25 ltr cylinder leaking from top

if it is comming out of the cover , you will need to replace the unit ther is no way to fix the tank,, is it comming out of both the inlet and outlet, if it is just comming out of one wipe it of and look at the threads it could just be the adapter in which case you need to drain it and cut the pipe remove the adapter put teflon tape with pipe thread sealer. put the adapter back on, re attach the pipe, if it still leaks you will have to change the unit, if it is electric make sure you turn it off at the circuit breaker before draining you don;t have to drain it all the way

SOURCE: Can I Use Existing Venting from Old Water Heater?

Late answer to an old post, but no you can't use the existing vent pipe. The tankless systems require Category III vents along with all the accessories required for your installation. I suggest you use a direct vent model with the concentric vent through the wall. Remove and patch the roof penetrations of the old vent or just abandon and let it remain.

SOURCE: it's leaking slowly from the top

if the line feels cold its the fill line if warm its the hot line either line try to tighten the connection if no good or leak is from solder or connection if u have valves to and out shut them off or turn off main open a faucet relieve pressure at heater either solder the line to repair or if connection Teflon tape joint and retighten connection good luck and thanks for using fixya

SOURCE: I have a Rheem glas fury model 22-40 gas water - leaking

once they leak it's time for a new water heater. ther is no way to repair a tank leak

SOURCE: I have a Rheem 81v52dt 50 Gal Elec heater. Water

If you mean the safety valve, replace it. They're only a few dollars.