Tankless Water Heater Savings Calculator
Tankless water heaters avoid the standby losses of keeping a full tank hot. This calculator estimates your yearly saving and how long the upgrade takes to pay back.
Change any number below — your result updates instantly, no button to click.
Your details
Results
Years until the upgrade pays for itself.
Measure or improve the real-world result
These tools are relevant to the numbers above; you do not need them to use the calculator.
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How it works
Yearly saving = current water heating cost × saving % ÷ 100. Payback = upgrade cost ÷ yearly saving. The 10-year figure is 10 years of savings minus the upgrade cost. Tankless heaters also last longer and free up space — benefits not counted here.
Frequently asked questions
How much do tankless heaters save?
Typically 8–35% on water heating energy, with the biggest savings for low-to-moderate hot water use where standby tank losses dominate.
Are they worth the higher upfront cost?
It depends on the saving and install cost — the payback above tells you. They also last longer (often 20+ years) and never run out of hot water.
What is standby loss?
The energy a storage tank wastes keeping water hot around the clock, even when no one uses it. Tankless heaters avoid this by heating on demand.
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