Electric radiator vs Tankless water heater: which costs more to run? (2026)
Estimates use U.S. average $0.180 $/kWh, typical wattage, and typical hours/day from our catalog. Adjust on each appliance page.
Electric radiator
- Typical watts
- 1500 W
- Hours/day
- 6
- Monthly est.
- $48.54
- kWh/mo
- 270.0
Tankless water heater
- Typical watts
- 18000 W
- Hours/day
- 1
- Monthly est.
- $97.08
- kWh/mo
- 540.0
Tankless water heater is estimated to cost more per month at typical use.