# What size breaker do you need for a tankless water heater?

Keeping this in view, how many amps do you need for a tankless water heater?

120 amps

Similarly, does a tankless water heater need a dedicated circuit? A **tankless water heater** will require a **dedicated circuit** as specified by the installation manual of the unit that has been selected. If you **need** additional space in the panel for the **circuit** breaker then a quad **circuit** breaker may be allowed as specified by the make and model of the panel.

Beside above, what size breaker do I need for a 220 volt water heater?

A **water heater** of this type is required to be considered a continuous load meaning that the branch **circuit** needs to be calculated at 125% of the **heater's** rated ampacity. 4500/240 = 18.75 amps, will work on a 20 **amp** OCPD but, 18.75*125% = 23.4 amps, requires a 25 or 30 **amp circuit**.

What size breaker do I need for a 240 volt water heater?

Since this is a purely resistive load 5500 watts at **240 volts** is 23 amps, **breaker** is sized at 30 amps and 10 awg wiring is used. In your case if the elements are strapped for 4500 watts draw is 18.75 amps, permanent draw loads should be sized at 80% of **breaker** capacity so a 20 **amp breaker** is limited to 16 amps.