Flexible Copper Pipe for Water Heater Installation & Cut-Off
I have to replace my water heater. The old heater is connected with 3/4 inch rigid copper pipe and solder connections. I am thinking about using 3/4 inch flexible copper supply and feed lines, available at Home Depot, for ease of installation. I would use a 3/4 inch compression fittings on the copper pipes to the house to make the connections to the flexible copper pipe.
How well does the flexible copper pipe hold up? Does it leak over time (pin hole or catastrophic break)? Or should I just sweat solder rigid pipe to make the connections? Is it OK to use compression fittings on the copper piping to the house, or should I sweat solder male threaded adaptors on?
Also, I need to replace the cut-off valve (old one leaks). A gate valve is on the supply line. Can I replace it with the common washer variety of valve (compression valve), or should I use another gate valve or a ball valve?