Interactive Tool
Tankless Water Heater Savings Calculator
Enter your details to see how much a tankless water heater could save you compared to a traditional tank model over 10–20 years.
Your Details
Estimated Net Savings Over 15 Years
$-4,025
After installation cost + maintenance (still worth it for comfort + lifespan)
Annual Energy Savings
$165/yr
Payback Period
22 years
Total Cost of Ownership (15 Years)
Energy: $8,250 + 1 replacement(s): $1,500
Install: $3,500 + Energy: $5,775 + Maintenance: $3,000
Don't forget rebates! The federal tax credit can save you up to $2,000, reducing the payback period by 2–4 years. Check available rebates
How We Calculate Savings
Our calculator uses the Department of Energy's efficiency estimates: tankless gas units are approximately 24–34% more efficient than conventional storage tank heaters, while electric tankless models are approximately 8–20% more efficient in terms of total energy cost (despite higher UEF ratings, electricity costs more per BTU in most markets).
Maintenance costs are estimated at $200/year for annual descaling and periodic filter replacement. Tank replacement costs assume a standard 50-gallon unit at $1,500 installed, replaced every 10 years. These are averages — your actual costs may vary based on local energy prices, water hardness, and usage patterns.