Can You Use Flex Fuel Line on a Water Heater in Michigan?

No, flex fuel line is not suitable for water heaters in Michigan; use appropriate water heater piping materials for safety and compliance.

Installing or repairing gas lines for water heaters requires strict adherence to local codes. In Michigan, flex fuel lines face specific restrictions that homeowners and technicians must understand.

Flex fuel line compatibility for MI water heaters

Michigan’s Fuel Gas Code Requirements

The Michigan Residential Code (2015) governs fuel gas installations. Section 24 specifically addresses proper materials and methods for gas piping systems.

Approved Materials for Gas Lines

Michigan requires these materials for water heater gas connections:

  • Rigid copper tubing (Type K or L)
  • Corrugated Stainless Steel Tubing (CSST)
  • Black iron pipe

Flexible copper connectors like those sometimes used for dryers are prohibited for water heater installations. As noted in HVAC technician forums, copper flex lines pose kinking risks and don’t meet durability standards for permanent water heater connections.

Flex fuel lines not suitable for water heaters MI

Why Flex Fuel Lines Are Restricted

Michigan prohibits flex fuel lines for water heaters due to:

Safety Concerns

Flexible copper tubing can:

  • Kink and restrict gas flow
  • Fatigue over time from vibration
  • Be more susceptible to physical damage

Code Compliance

The International Fuel Gas Code (IFGC) Section 411.1.3.1 specifies rigid piping requirements for appliance connections. While some jurisdictions allow flexible connectors in limited applications, Michigan maintains stricter standards.

Proper Installation Methods

For code-compliant water heater gas connections in Michigan:

Rigid Piping

Black iron pipe remains the most common solution. It must be:

  • Properly sized for BTU requirements
  • Supported at regular intervals
  • Protected from physical damage

CSST Alternatives

Corrugated stainless steel tubing offers some flexibility while meeting code requirements when:

  • Properly bonded
  • Installed with manufacturer-approved fittings
  • Protected from abrasion
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As highlighted in HVAC professional resources, proper tools are essential for creating leak-free CSST connections.

Regional Variations in Michigan

While the state code provides baseline requirements, some local jurisdictions may have additional restrictions:

Region Additional Requirements
Detroit Metro CSST bonding inspections required
Grand Rapids Additional pressure testing
Upper Peninsula Freeze protection measures

Professional Installation Recommendations

Given the complexity of gas line work, homeowners should:

  • Always hire licensed professionals
  • Verify proper permits are pulled
  • Request pressure testing documentation
  • Ensure final inspection is completed

The Michigan Residential Code provides complete details on approved installation methods, while resources like the National Fire Protection Association offer additional safety guidelines.

Joye
Joye

I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.