What Size Electrical Panel Do You Need For a Heat Pump Water Heater?

Heat pump water heaters are quickly becoming the future of water heating technology, with their efficient method of water heating being a great alternative to traditional gas tank units (particularly with the upcoming gas water heater ban in Sonoma and Marin County). Knowing this, you may be considering upgrading your current water heater to a heat pump system. But while this is a great proactive step toward efficiency, there are important considerations to keep in mind. One of the main ones being whether you need an electrical panel upgrade or not.

Before you add on a large electrical appliance like a heat pump water heater, you need to make sure your electrical panel is appropriately sized to take on such a heavy piece of equipment. But how do you know the correct size your panel needs to be?

Do I Need an Electrical Panel Upgrade? How To Size Your Panel

The first step when determining your electrical panel size is to analyze your current panel along with the requirements of the heat pump water heater system you are wanting to install. Before installation, it is vital to perform a load calculation: an assessment of all your electrical appliances that tells you the exact amount of energy required to operate all of your appliances safely.

Heat Pump Water Heater Requirements

Before performing the load calculation on your current appliances, check all of the amperage and voltage requirements on the heat pump water heater. The amperage is the strength of the electric current while the voltage is the pressure from the electrical source that pushes the power. According to the national water heater code, heat pumps require their own dedicated circuit, which is a line of electrical power used for only one appliance, rather than sharing energy load with other outlets. Most common voltages for heat pump water heaters are 240 or 120 for newer models. A typical 240V heat pump water heater dedicated circuit will take between 20 and 60 amps, which is information you will need to keep in mind when you look at your existing load.

You will also need to take into account the capacity rate, since higher capacity will require more power. Efficiency ratings are another thing to keep in mind, since higher-efficiency units will take less power.

Existing Load Calculation

You can perform a load calculation yourself if you do not want to hire a local electrician to do it. Take note of each one of your current electrical appliances and how much amperage they are using. Look at your current panel’s total capacity and whether you have a 100, 150, or 200-amp panel. Also think about peak usage times, like evenings and winter-time, where your load is going to be heaviest.

Future Appliance Considerations

You may be considering further electrification upgrades in the future. In this case, you will want to keep it in mind now when calculating for your heat pump water heater installation. If you are thinking of adding an EV charger or upgraded HVAC equipment, you will have to include those in your calculations, as well as the possible peak time of usage for those items.

Safety Margin

You will want to include a 20% buffer in your calculation as a safety measure to account for things like electrical spikes and overloads.

After calculating all of this information, you will have your electrical panel size requirements for adding a heat pump water heater. More than likely, you will find you require a 200-amp panel.

Other Considerations

Electrical panel size and load calculation are not the only aspects to take into consideration. There is also the overall picture of your electrical panel to think about. Even if you have a panel that is properly sized for your heat pump water heater installation, it won’t matter if the panel is in bad shape or has no more room for another breaker.

Panel Age & Condition

An older panel (20-30 years old) was not built for the large electrical load of today. You will most likely need an upgrade if your panel is this old. You also need to look at the condition of the panel. If there are signs of rust, damaged wires, loose parts, corrosion, or burn marks from overheating, a panel upgrade from a local electrician is a good idea for safety reasons.

Physical Space

You also want to be sure your panel actually has room for an additional breaker. Check to make sure there is a slot available for the dedicated heat pump water heater installation circuit. It is sometimes possible to rearrange circuits to make room but you will need a professional electrician to help with this.

Panel Options

If you do not have a 200-amp electrical panel size, your panel is in poor condition, or your panel is out of space, there are different options you can consider when upgrading.

Subpanel

If you find your load calculation is too big for your current panel, subpanels are a common option to distribute your electrical load. A subpanel is a smaller breaker box used to distribute power to electrical equipment in a specific area of the house. They are common for smaller homes with limited panel capacity. They are a great option for a heat pump water heater that needs a dedicated circuit. You can even position the subpanel near your water heater installation to lower wiring costs.

Smart Load Management

If you don’t want to do a full electrical panel upgrade, there are smart load management devices that can help you manage the draw from your electrical appliances. Smart load management devices installed by a local electrician allow you to monitor your energy levels and they can then automatically adjust energy-levels of your larger appliances at times when the demand is reaching the peak limit.

SPAN Panel

If you are looking into a full electrical panel upgrade, a SPAN panel is a good device to look into. SPAN panels are a type of smart panel that allow you to track your electrical energy usage through a mobile app, as well as control energy at each individual circuit. You are able to get insights on the exact amount you are spending on your electrical utilities and have full control over switching a breaker on or off all from one app. A SPAN panel or smart panel installation is a strong choice if you are undergoing a major house renovation or want to prepare for future electrification upgrades beyond a heat pump water heater installation.

Help From a Local Electrician

Determining electrical panel size requires extremely precise work that can be overwhelming to handle on your own, especially when installing a new electrical appliance as big as a heat pump water heater. This is where a professional electrician really comes in handy.

John Owens Services has been providing expert electrical services to the Sonoma and Marin County areas for 30 years. We are licensed and experienced in a wide range of electrical work, from electrical panel upgrades, to installing electric appliances like heat pump water heaters. Not only can we help with the heat pump water heater sizing and installation process, but we can perform load calculations for you to help determine if your electrical panel needs any adjustments to accommodate the new appliance. We are knowledgeable in subpanel and SPAN panels as well if you are looking to upgrade to accommodate a larger electrical load.

You don’t have to do all the work yourself. Call on a licensed electrician today to help you ensure efficient energy savings!

Key Takeaways

• Determine your panel size through a load calculation: calculate the specs from the heat pump water heater, your current amount of electrical appliances, any future appliances you are thinking of adding, and the 20% safety margin.
• Look at the age and condition of your panel as well as the available space for additional breakers to determine if a panel upgrade would be beneficial.
• Consider options like subpanels, smart load management tools, or a SPAN panel upgrade to allow for more efficient energy monitoring and usage.
• Get assistance from John Owens Services, a local electrician in your area, with expertise in all things electrical.