Guides ·
Copper vs Flex vs Stainless: Choosing the Right Water Heater Connections
The pipes connecting your water heater affect leak risk and water quality. Here is how the options compare.

Key takeaways
- Copper with lead-free solder is durable and safe for drinking water.
- Stainless steel flex lines resist corrosion and ease future service.
- Avoid mixing metals without dielectric protection.
Old galvanized connections rust from the inside, restrict flow and can discolor your water. New installations deserve better.
Copper with lead-free solder
Rigid copper is long-lasting and clean. We use lead-free solder that meets drinking water standards.
Stainless steel flex connectors
Flexible, corrosion-resistant and easy to service, which makes them a great choice for seismic movement.
Rust-resistant piping
Replacing corroded galvanized nipples with corrosion-resistant fittings prevents leaks and rusty water.
Ask about your connections
We upgrade connections as part of our install. Call HOTCO at (916) 905-4468. We answer 24/7 and serve Roseville, Rocklin, Lincoln, Granite Bay, Folsom, Sacramento and the rest of Placer and Sacramento Counties.
Frequently asked questions
- Is lead-free solder required?
- Yes. Lead-free solder is required for potable water plumbing.


