Home / Personal & Bathroom / Cost to run Tankless water heater
How much does it cost to run a tankless water heater? ($91.80/mo)
Running a tankless water heater costs about $91.80 / month
($3.06/day at 1 h/day, $0.17/kWh).
($3.06/day at 1 h/day, $0.17/kWh).
Running cost calculator
Per hour—
Per day—
Per month—
Per year—
Energy/mo—
An electric tankless heater heats water instantly on demand, so it draws enormous power but only while a hot tap is running.
Cost at different electricity rates
| Electricity rate | Per day | Per month | Per year |
|---|---|---|---|
| $0.10/kWh | $1.80 | $54.00 | $657.00 |
| $0.15/kWh | $2.70 | $81.00 | $985.50 |
| $0.20/kWh | $3.60 | $108.00 | $1,314.00 |
| $0.25/kWh | $4.50 | $135.00 | $1,642.50 |
| $0.30/kWh | $5.40 | $162.00 | $1,971.00 |
| $0.40/kWh | $7.20 | $216.00 | $2,628.00 |
Cost over time
| Per hour of use | $3.06 |
| Per day (1 h) | $3.06 |
| Per month | $91.80 |
| Per year | $1,116.90 |
How to spend less
- Run it fewer hours or on an eco / lower setting.
- Upgrade to a more efficient model (check the energy label).
- Use a smart plug or timer to kill standby and idle draw.
Want the raw figure? See how many watts a tankless water heater uses.
FAQ
How many watts does a tankless water heater use?
Whole-home electric tankless units draw 10,000-36,000 watts while running.
Do tankless heaters save money?
They cut standby losses, but the high draw needs a heavy electrical service.
More in Personal & Bathroom