What Size Breaker Do You Need for a Hot Water Heater?

If you’re wondering what size breaker you need for a hot water heater, you’ve come to the right place. In this blog post, we’ll answer that question and give you some tips on choosing the right breaker for your needs.

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A circuit breaker is an important part of your home’s electrical system. It protects your home from electrical hazards by disrupting the flow of electricity when it senses a problem. If you have a hot water heater, you’ll need to know what size circuit breaker to use to ensure that your home is safe.

The size of the circuit breaker you need for a hot water heater will depend on the current draw of the appliance. Most modern hot water heaters have a current draw of 30 amps, but some models may be as high as 50 amps. To be safe, it’s always best to check your appliance’s manual to determine the exact current draw.

Once you know the current draw of your appliance, you can choose a circuit breaker with the appropriate amperage rating. For example, if your appliance has a 30-amp current draw, you’ll need to use a 30-amp circuit breaker. If your appliance has a 50-amp current draw, you’ll need to use a 50-amp circuit breaker.

Types of Hot Water Heaters

There are many types of hot water heaters available on the market today. Each type has its own set of benefits and drawbacks. The size of the breaker you need will depend on the type of hot water heater you have.

Storage Water Heaters

Most homes have a storage water heater. Storage water heaters have one or two tanks that hold water. The tanks come in a variety of sizes, ranging from 20 to 80 gallons or more.

Your choice of a storage water heater will depend on many factors. But an important consideration is the size of your household—larger families need larger storage tanks to ensure there is enough hot water for everyone.

If you live in a colder climate, you’ll also want to choose a storage water heater with a higher first-hour rating (FHR), which measures how much hot water the heater can deliver in an hour and is listed on the EnergyGuide label. The higher the FHR, the less likely you are to run out of hot water during peak demand periods.

Tankless Water Heaters

Tankless water heaters are a more recent invention and are becoming increasingly popular, especially in homes where space is limited. As the name suggests, these water heaters do not have a tank and instead heat water on demand. This means that you only use energy when you need hot water, making tankless water heaters more energy-efficient than their traditional counterparts.

There are two types of tankless water heaters: point-of-use and whole-house. Point-of-use tankless water heaters are small, compact units that can be installed near the fixtures they will be supplying with hot water. These units are designed for small homes or apartments where space is limited and demand for hot water is modest. Whole-house tankless water heaters are larger units that supply hot water to the entire home. These units are best suited for larger homes with a high demand for hot water.

When choosing a tankless water heater, it is important to select the right size for your home. If you choose a unit that is too small, it will not be able to meet your hot water needs. If you choose a unit that is too large, it will be less energy-efficient and cost more to operate. Consulting with a professional can help you select the right size tankless water heater for your home.

Factors to Consider When Choosing a Hot Water Heater

There are a few factors you need to consider when selecting a hot water heater. The first is the size of the unit. The size of the hot water heater will be determined by the number of gallons of water it can hold. The next thing to consider is the type of fuel it uses.


The capacity of a hot water heater is measured in gallons. It’s important to choose a size that meets the hot water needs of your household. A family of four, for example, typically uses between 80 and 100 gallons of hot water per day. One way to determine the appropriate size is to use the Department of Energy’s sizing calculator.

In addition to capacity, you also need to consider the first hour rating (FHR). This measures how much hot water the heater can provide in an hour and is particularly important if you have a large family or live in a climate with very cold winters. The higher the FHR, the better.


Efficiency is an important factor to consider when choosing a hot water heater. The most efficient option is a tankless hot water heater. Tankless water heaters heat water on demand, so you are not paying to heat a tank of water that you may not use. They are more expensive than traditional hot water heaters, but they will save you money in the long run.

Other factors to consider when choosing a hot water heater include the size of the tank, the recovery time (the time it takes to heat up a tank of cold water), and the warranty.


Your hot water heater will need to be the right size to meet your household’s demands. To help you select the best hot water heater for your needs, consider the following factors:
-The number of people in your household: More people means more demand for hot water.
-The type of home you have: A single-family home will have different heating demands than an apartment.
-The climate you live in: Homes in warmer climates generally don’t need as much hot water as homes in colder climates.
-Yourwater usage: If you have a high demand for hot water, you’ll need a larger unit.


As you can see, there are a lot of factors to consider when choosing the right size breaker for your hot water heater. Although you may be tempted to save money by choosing a smaller breaker, this could end up costing you more in the long run if your hot water heater needs more power than the breaker can provide. Choosing a larger breaker than necessary is also not recommended, as this could create a safety hazard. If you are unsure of what size breaker to choose, it is always best to consult with an electrician or other qualified professional.