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.
Your details
Results
Years until the upgrade pays for itself.
Last updated June 30, 2026. Results update automatically as you type.
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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