When the melted solder covers the joint entirely, allow it to cool. How about using PEX for the popoff valve? I need to run water to a bathroom addition I'm building. Before connecting the PEX pipe to the water heater, find a suitable metal connector to install onto the water heater. Zurn PEX must be kept at least 6" away from the exhaust vent of a gas-fired water heater.
It is recommended to install a metal connector to the water heater first before connecting the PEX tubing.
Tie PEX into water pipes at water heater? Hows this look?
Connect the brass manifold to the copper pipe and secure it using a pipe sealant. Zurn PEX has brass male and female threaded adapters and swivel adapters that can be used for this application. See, for example, cdc. It's also way cheaper than copper, which is attractive. Plumbing the water connections I choose to use PEX, flexible stainless steel connectors and copper for the water connections. Here is the outside location of the old exhaust not to code.