Are flex lines best?

[63air]

I am about to start the water heater replacement project on my '63 Globetrotter and am deciding on what to use in making the gas and water line connections. It looks to me that flexible lines are the best way to go but there are a number of options. I will be tying into new PEX water lines and the existing gas line which will need some relocating/modification. Looking for opinions and suggestions. I only want to do it one leak free time.

[uwe]

Originally Posted by 63air

I am about to start the water heater replacement project on my '63 Globetrotter and am deciding on what to use in making the gas and water line connections. It looks to me that flexible lines are the best way to go but there are a number of options. I will be tying into new PEX water lines and the existing gas line which will need some relocating/modification. Looking for opinions and suggestions. I only want to do it one leak free time.

PEX is semi flexible, and would surely make good supply lines and discharge lines for the new water heater. That's what I am using on my Overlander project. Consider a water heater bypass kit since you are in a cold climate.
For gas supply lines, you can either dupliate your existing setup, modified to fit teh new water heater gas inlet, or use a flexible low pressure LP line, available from many RV stores. Make sure the connection to the main LP supply is outside the trailer, under the belly pan. It's a safety code.