Tankless water heaters are becoming increasingly popular among homeowners for their energy efficiency, space-saving design, and ability to deliver hot water on demand. Unlike traditional storage tanks, these systems heat water only when needed, reducing energy consumption and utility bills. If you’re considering
installing a tankless water heater, this guide covers everything you need to know—from preparation and tools to installation steps, safety considerations, and maintenance tips.
Why Choose a Tankless Water Heater?
Before diving into the installation process, it’s important to understand why many households are upgrading:
•
Energy Efficiency – Tankless heaters use 24–34% less energy compared to traditional units (U.S. Department of Energy).
•
Endless Hot Water – Perfect for large families or homes with multiple bathrooms.
•
Compact Size – Saves space in small apartments or utility rooms.
•
Long Lifespan – With proper care, units can last 15–20 years.
Tools and Materials Needed
Before
installing a tankless water heater, gather the following:
• Adjustable wrench
• Pipe cutter
• Screwdrivers (flathead and Phillips)
• Pipe insulation
• Gas line kit (for gas units) or electrical wiring (for electric units)
• Teflon tape
• Venting kit (for gas heaters)
• Mounting hardware
Safety Note: If you’re not comfortable working with gas, electricity, or plumbing connections, hire a licensed plumber or electrician to avoid accidents.
Step-by-Step Guide to Installing a Tankless Water Heater
1. Choose the Right Location
• Install near existing water lines and power/gas supply.
• Ensure proper ventilation for gas models.
• Keep it accessible for maintenance and future inspections.
2. Shut Off Utilities
• Turn off the main water supply.
• Shut off the gas or electricity before disconnecting your old heater.
3. Remove the Old Water Heater
• Drain the tank completely.
• Disconnect water, gas, and power connections.
• Safely remove the unit and dispose of it according to local regulations.
4. Mount the Tankless Unit
• Use mounting brackets to secure the heater to the wall.
• Ensure the wall is strong enough to support the unit’s weight.
5. Connect Water Lines
• Attach cold water inlet and hot water outlet pipes.
• Use Teflon tape to prevent leaks.
• Install shut-off valves on both lines for easier maintenance.
6. Install Gas or Electrical Connections
•
Gas Models: Connect to the gas supply with an approved gas line kit. Test for leaks with a soap-water solution.
•
Electric Models: Wire the unit directly to your electrical panel with proper circuit breakers.
7. Venting (For Gas Units)
• Install vent pipes according to manufacturer instructions.
• Ensure venting goes outside and meets local building codes.
8. Final Setup and Testing
• Slowly turn on the water supply.
• Check for leaks in pipes and fittings.
• Power on the unit and adjust temperature settings.
• Run hot water for several minutes to ensure proper function.
Common Mistakes to Avoid
•
Skipping Permits – Always check local codes; some areas require inspection.
•
Incorrect Sizing – Choosing the wrong capacity leads to inconsistent heating.
•
Improper Venting – Can cause dangerous carbon monoxide buildup.
•
DIY Electrical/Gas Work – Mistakes can be costly and unsafe.
Cost of Installing a Tankless Water Heater
The cost varies based on location, type, and complexity:
•
Gas Tankless Installation: $1,000 – $3,000
•
Electric Tankless Installation: $800 – $2,500
•
DIY Install: $500 – $1,200 (materials only)
For reference, see HomeAdvisor’s detailed breakdown of
tankless water heater costs.
Maintenance Tips for Longevity
Even after
installing a tankless water heater, regular upkeep is essential:
•
Flush Annually – Use vinegar or a descaling solution to remove mineral buildup. (Check our guide on
Tankless Water Heater Flush).
•
Check Air Filters – Clean or replace to prevent overheating.
•
Inspect Pressure Relief Valve – Ensures system safety.
•
Monitor Error Codes – Modern units display alerts when issues arise.
SERP Insights: What Competitors Cover
From analyzing the top 5 results for
installing tankless water heater, key themes include:
• Step-by-step installation instructions.
• Cost breakdowns and professional vs DIY.
• Safety considerations and building codes.
• Comparisons between gas and electric models.
This article covers all these while also adding
unique value with practical maintenance and error-prevention insights.
Conclusion
Installing a tankless water heater is a worthwhile investment that saves money, conserves space, and provides endless hot water. Whether you choose DIY installation or professional service, following proper steps ensures safety, efficiency, and long-term reliability. By avoiding common mistakes and maintaining the system regularly, you can maximize the lifespan of your unit and enjoy worry-free hot water for years to come.
