How Much Does a Tankless Water Heater Cost to Run?
A tankless water heater costs approximately $701/year to run at $0.16/kWh. That is $58.40/month or $3.840/hour.
💰 Tankless Water Heater Running Cost Calculator
Based on 24000W rated power. Actual varies by model and usage.
Tankless Water Heater Cost at Different Rates
| Rate | Monthly | Annual |
|---|---|---|
| $0.08 | $29.17 | $350 |
| $0.10 | $36.50 | $438 |
| $0.12 | $43.83 | $526 |
| $0.16 | $58.42 | $701 |
| $0.20 | $73.00 | $876 |
| $0.25 | $91.25 | $1,095 |
| $0.30 | $109.50 | $1,314 |
| $0.35 | $127.75 | $1,533 |
Tankless Water Heater Energy Usage Explained
A tankless water heater consumes 24000W. At 0.5 hours/day for 365 days/year, that is 4,380 kWh annually — about 41.7% of average US household usage (10,500 kWh).
How to Calculate Running Cost
Cost = (Watts ÷ 1000) × Hours × Rate
For your tankless water heater: (24000W ÷ 1000) × 0.5 hrs × $0.16/kWh = $1.92/day.
Tips to Reduce Costs
Use time-of-use electricity plans for off-peak rates ($0.05–$0.10/kWh overnight). Upgrade to Energy Star certified models. Use smart plugs or timers. Check rates in your state with our Electricity Cost Calculator.
Disclaimer: Estimates based on rated wattage. Actual consumption varies by model, age, and usage patterns.