What size water heater do I need for hybrid?

Author: Geym

Feb. 24, 2024




Tags: Home Appliances

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When it comes to choosing a water heater for your home, there are several factors to consider, including the size of the unit. For those interested in a more energy-efficient option, a hybrid water heater may be the way to go. However, determining the right size for a hybrid water heater can be a bit more complicated than for traditional models. In this article, we will discuss what size water heater you need for a hybrid system.

Hybrid Water Heaters: An Overview.

What size water heater do I need for hybrid?

Hybrid water heaters combine the best of both worlds by using both electricity and a heat pump to heat water. The heat pump extracts heat from the air and transfers it to the water, making it a more energy-efficient option compared to traditional electric resistance heaters. This can result in lower energy bills and reduced environmental impact.

Calculating the Size.

When determining the size of a water heater, you need to consider two main factors: the first-hour rating (FHR) and the gallons per minute (GPM) flow rate. The FHR is a measure of how much hot water the unit can provide in the first hour of use, while the GPM flow rate indicates how much hot water the unit can deliver per minute.

To calculate the size of a hybrid water heater you need, consider the number of people in your household, the number of bathrooms, and the peak hot water usage times. A general rule of thumb is to allocate 10-15 gallons of hot water per person in your household. For example, a family of four would typically require a water heater with an FHR of at least 50-75 gallons.

It is also important to consider the GPM flow rate, especially if you have multiple bathrooms that are used simultaneously. The higher the GPM flow rate, the more hot water the unit can deliver at once. Make sure to choose a water heater with a GPM flow rate that can meet your household's peak hot water demands.

Other Considerations.

In addition to the FHR and GPM flow rate, there are other factors to consider when choosing the right size water heater for your hybrid system. These include the climate in your area, the insulation of your home, and the location of the water heater. Cold climates may require a larger unit to compensate for heat loss, while well-insulated homes may benefit from a smaller water heater.

It is also important to consult with a professional to determine the correct size for your hybrid water heater. An experienced plumber can assess your household's hot water usage and recommend the most suitable unit for your needs.


In conclusion, choosing the right size water heater for a hybrid system involves considering the first-hour rating, gallons per minute flow rate, and other factors specific to your household. By calculating your hot water needs and consulting with a professional, you can ensure that you select the most efficient and effective water heater for your home.

If you have any questions or need assistance in choosing the right size water heater for your hybrid system, feel free to contact us. Our team of experts is here to help you make the best decision for your household's hot water needs.

You can find more information on our web, so please take a look.

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