When planning out your baseboard heater settings, it’s essential that you keep your amp breakers in mind. Most US households have a **20-amp circuit**. The key question to answer is *‘how many baseboard heaters can you put on a 20-amp circuit?’*.

The answer is quite self-evident: The net amp draw of all baseboard heaters on the same 20-amp breaker has to be ** less than 20 amps**.

Now, the key question is how many amps do baseboard heaters draw. **Voltage is the key** here (due to the basic power equation; **P = I x V**).

We’ll look into how you calculate how many baseboard heaters can be put on a 20-amp circuit and check how many amps do baseboard heaters draw. We will also show 2 examples of perfect baseboard settings for a 20-amp circuit.

Here’s the summary on what is the maximum baseboard heating load that may be connected to on a 20 amp circuit breaker:

If you use **120V baseboard heaters**, the 20-amp circuit can support a net total of **2,400 W**. That’s *one* 2,000 W baseboard heaters or *two* 1,000 W baseboard heaters.

If you use **240V baseboard heaters**, the 20-amp circuit can support a net total of **4,800 W**. That’s *two* 2,000 W baseboard heaters or *three* 1,500 W baseboard heaters.

In short, a 20-amp circuit can handle anywhere from 2,400 W to 4,800 W of baseboard heater electric power input. It all depends on the voltage.

Let’s check how many amps do standard electric baseboard heaters draw:

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## How Many Amps Do Baseboard Heaters Draw?

Here’s how many amps do baseboard heaters on 120V and 240V draw:

Baseboard Power: |
Amp Draw (at 120V): |
Amp Draw (at 240V): |

500 W | 4.17 amps | 2.08 amps |

750 W | 6.25 amps | 3.13 amps |

1,000 W | 8.33 amps | 4.17 amps |

1,500 W |
12.5 amps |
6.25 amps |

2,000 W | 16.67 amps | 8.33 amps |

3,000 W | 25 amps | 12.5 amps |

Let’s solve 2 examples to illustrate the difference the voltage makes when sizing baseboard heaters to a 20-amp circuit.

### Example 1: How Many 1,500 W Baseboard Heaters Can You Hook Up To 20-Amp Circuit?

The standard power input for a baseboard heater is 1,500 W. We need to determine how many amps does a 1,500 W heater draw.

To calculate the amps, we use the basic electric power equation:

**P (Watts) = I (Amps) x V (Volts)**

We know the watts (electrical power) and volts (electrical potential). Let’s express the amps (electric current):

**I (Amps) = P (Watts) / V (Volts)**

We have a 1,500 baseboard heater. Let’s see how many amps does it need to run if we use a 120V circuit or a 240V circuit:

**I (Amps at 120V) = 1,500 W / 120 V = 12.5 A**

**I (Amps at 120V) = 1,500 W / 240 V = 6.25 A**

As we can see, the 1,500 W baseboard heater draws 12.5 amps at 120V, and 6.25 amps at 240V.

That means that we can use a 1,500 W baseboard heater on a 20-amp circuit.

However, if we have a 120V circuit, we can only use one 1,500 W heaters (it only has a 12.5 A draw). Why? Well, if we would connect two such heaters, the total amp draw would be 25 amps. This would surpass the capacity of a 20-amp circuit.

Here’s what’s interesting:

If we have a 240V circuit, we can connect up to three 1,500 W baseboard heaters. That’s because its net amp draw is 3 x 6.25 A = 18.75 A. This is less than 20 A.

That means that we can connect three 1,500 W heaters, netting a total output of 4,500 W, if we have a 240 V circuit. If we have a 120 V circuit, you can only connect one 1,500 W heater, with a net electric power input being only 1,500 W.

Note: We can also put one 120 V 1,500 W heater + one 240 V 1,500 W heater on a 20-amp circuit. This total amps here are 12.5 A + 6.25 A = 18.75 A; less than 20 A. In this way, a 20-amp circuit can support 3,000 W worth of electric baseboard heaters.

### Example 2: Can We Put A 3,000 W Electric Baseboard Heater On A 20-Amp Circuit?

If we calculate a bit (or you can check the table above) we see that:

- At 120V, a 3,000 W baseboard heater draws 25 amps.
- At 240V, a 3,000 W baseboard heater draws 12.5 amps.

Now, a 20-amp circuit can only handle devices that draw up to 20 amps. We can see that, if we have a 240V circuit, we can run a 3,000 W heater on a 20-amp circuit. That’s because it draws less than 20 amps; 12.5 amps, to be exact.

Using the same reasoning, we can’t connect a 120V 3,000 W baseboard heater. That’s because it draws 25 amps; too much for a 20-amp circuit.

If you’re in a market for electric baseboard heaters, you are welcome to check out our list of the best electric baseboard heaters here. If you also have any questions about how big a baseboard heater you can connect to a 20-amp breaker, you can pose the question in the comments and we’ll try to help you out.