What size breaker do I need for tankless?

A gas tankless water heater only needs a 15-amp, 120 volt dedicated single-pole breaker for this purpose.

What size wire do I need for a tankless water heater?

You must utilize either a 120- or 240-volt circuit, wholly devoted to the heater. Both voltages require 8-gauge wire, and the section exposed to the area under the sink must be armored cable. If the manufacturer’s instructions call for a larger cable, the National Electrical Code says you must comply.

How many amps is 4500 watts water heater?

18.75 amps
A typical 50 gallon electric water heater runs at 4500 watts. In an electric circuit of 240 volts, 4500 watts is equivalent to 18.75 amps.

What gauge wire do you use on a water heater?

It’s a good idea to wire a hot water heater with wire that’s larger than the current requirement. A 20-amp hot water heater requires 12-gauge wire, a 25-amp hot water heater requires 10-gauge wire, and a 30- to 40-amp hot water heater requires 8-gauge wire.

What size breaker do I need for a electric tankless water heater?

Typical tankless requires 40-50 amp breaker for each wire. Each wire supplies 1 element. This example requires 3 breakers rated 40-50 amp = 120+ total amps.

How many amps does a tankless electric water heater use?

One whole-house tankless water heater has four 7,000-watt elements, for a total electrical load of 28,000 watts. This load re- quires wire and a circuit breaker that will handle at least 120 amps, at a cost many times that of electrical service to a conventional tank water heater.

Can I use 10 3 wire for a hot water heater?

Can I Use 10 3 Wire For A Hot Water Heater? You can use 10/3 wire. Use the red and black wires as hot conductors. The ground wire will run to the green screw.

How many amps does a tankless hot water heater need?

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

30-amp
Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a 30-amp double-pole breaker and 10-2 non-metallic (NM) or MC cable.

How do you size electrical wires?

Wire Gauge It’s counterintuitive, but the larger the number, the smaller the wire. The most common sizes you’ll find in residential work are 14-gauge and 12-gauge. Larger appliances such as electric stoves, electric water heaters, electric dryers and central air units will often use 10-, 8- or even 6-gauge wire.