Install a tankless water heater in a well-ventilated area, close to the point of use, preferably in a basement, garage, or utility room for optimal performance.
Tankless water heaters provide endless hot water while saving space and energy. But their performance depends heavily on proper placement. Follow this guide to find the optimal installation spot for maximum efficiency and longevity.
Indoor vs Outdoor Installation
Most tankless units work best indoors. Outdoor installations require special considerations:
Indoor Locations
- Basements – Near main water/gas lines
- Utility closets – Protected from elements
- Garages – Must be climate-controlled
Outdoor Locations
- Require freeze protection kits in cold climates
- Need weatherproof enclosures
- Must have proper venting clearance
Key Placement Factors
Proximity to Demand Points
Install within 30 feet of primary hot water fixtures like showers. Consider adding a point-of-use unit for distant fixtures.
Ventilation Requirements
Gas models need 12+ inches clearance around vents. Electric units require less space but still need airflow.
Access for Maintenance
Leave 24 inches front clearance for servicing. Wall-mounted units should be 18+ inches off the floor.
Special Installation Cases
Attic Installations
Require reinforced flooring and proper drainage pans. Vent pipes must extend through roof with proper flashing.
Mobile Homes
Need special earthquake straps and flexible gas/water connectors. Consult mobile home heater guidelines.
Professional Installation Tips
According to Department of Energy guidelines:
| Consideration | Requirement |
|---|---|
| Gas Line Size | ¾” minimum for most units |
| Water Pressure | 20-150 PSI range |
| Vent Material | Stainless steel recommended |
For complex installations, the International Association of Plumbing Officials recommends hiring licensed professionals.
Multi-Unit Solutions
Large homes may need parallel installations. Consider:
- Zoned systems with separate units for different floors
- Cascading setups with multiple heaters in series
- Hybrid systems with storage tanks for peak demand
Proper placement ensures your tankless system delivers maximum efficiency and lifespan. Always consult local codes and manufacturer specifications before installation.
