[adamtrwbrdg]

Hello. I am re-running the plumbing in the first floor of my house in cpvc. My plan is to do first floor this year, and second floor next year. How do I tie into hot and cold galvanized lines running upstairs and also how do you hook up cpvc at the hot water heater. Thanks

[KISS]

The galvanized will need to be threaded or unthread at a joint which may be impossible.

Then use a galvanized pipe union. This will give you a female thread on the galvanized pipe. The union makes it so you can fit pipes flush and allows disconnection.

Then get a CPVC male adapter and glue to the cpvc.

It's best to have male threads on the CPVC. Galvanized pip can easily split CPVC female fittings.

You can drop a flex line from the CPVC. Take a look at the big box stores.

[KISS]

Here is a typical hot water heater installation kit.

American Water Heater at Lowe's: Universal Water Heater Installation Kit