An electrician typically installs the electrical components, while a plumber handles the plumbing connections for a tankless water heater.
When installing a tankless water heater, you need both a licensed plumber and electrician. Plumbers handle water connections and gas lines (for gas models), while electricians manage the electrical wiring and load calculations. This dual-professional approach ensures safe, code-compliant installation.
Why Tankless Water Heaters Require Both Professionals
Tankless water heaters have complex installation requirements that span multiple trades:
- Plumbers handle water supply lines, gas connections (for gas models), venting, and mounting
- Electricians manage circuit requirements, load calculations, and wiring (especially for electric models)
- Both must coordinate to ensure proper clearances and code compliance
Plumber’s Responsibilities
Licensed plumbers perform these critical tasks:
| Task | Details |
|---|---|
| Water Connections | Installing proper shutoff valves and piping |
| Gas Line Work | For gas models, ensuring proper gas pressure and connections |
| Venting | Installing proper exhaust systems for gas units |
| Mounting | Securing unit to wall with proper clearances |
For gas models, proper venting is crucial. Built-in gas heaters require similar professional installation.
Electrician’s Responsibilities
Electricians handle these key electrical components:
- Load calculations to ensure your electrical panel can handle the demand
- Installing dedicated circuits (often 240V for electric models)
- Proper grounding and wiring connections
- Safety disconnect installation
According to Department of Energy guidelines, electric tankless models often require substantial electrical upgrades.
Installation Process Breakdown
1. Pre-Installation Assessment
Both professionals should evaluate your home’s capacity. Electricians check your electrical panel, while plumbers assess water pressure and gas lines.
2. Permitting
Most jurisdictions require permits for tankless water heater installation. Professionals handle this paperwork to ensure code compliance.
3. Actual Installation
The process typically follows this sequence:
- Electrician prepares electrical connections
- Plumber installs water and gas connections
- Unit is mounted and connected
- System is tested by both professionals
Special Considerations
Electric vs. Gas Models
Electric models like the Stiebel Eltron Tempra 36 require more electrical work, while gas models need proper venting and gas line sizing.
Whole-House vs. Point-of-Use
Smaller point-of-use units may have simpler requirements, but still need professional installation for warranty compliance.
Cost Factors
Installation costs vary based on:
- Need for electrical upgrades
- Gas line modifications
- Venting requirements
- Local labor rates
The American Home Shield recommends getting multiple quotes for complex installations.
Maintenance Requirements
After installation, regular maintenance is crucial:
- Annual descaling (especially in hard water areas)
- Filter cleaning
- Professional inspections every 3-5 years
For replacement parts, check our guide to tankless water heater replacement parts.
