Emporia Vue 3 vs Refoss EM16P (2026)

Side-by-Side Comparison

For full assessments of each monitor, see our Emporia Vue 3 review and Refoss EM16P review. For the overview of how both fit into the category, see the Best Whole Home Energy Monitors guide.

App Experience: Where the Vue 3 Pulls Ahead

The Emporia app is the single biggest reason most homeowners should choose the Vue 3. It takes the raw data from 16 circuits and translates it into something immediately useful: bill forecasts that predict your monthly total based on current trends, historical comparisons that show whether you are using more or less than last month, and cost breakdowns that assign dollar amounts to individual circuits. You do not need to understand kilowatt-hours to get value from it. The app tells you that your dryer costs a certain amount per load, that your HVAC is running more than it did the same week last year, and that you are on track to exceed your usual bill.

The Refoss app works, but it is clearly not the product’s strength. It shows real-time power readings and basic historical data, but it lacks the bill forecasting, cost tracking, and comparative analytics that make the Emporia app so immediately actionable. Refoss compensates for this with its local Web UI and open API, which are far more powerful for technical users but require more effort to set up and interpret. If you use Home Assistant, the Refoss data feeds directly into the Energy dashboard, which provides its own cost tracking and historical views, but that requires Home Assistant to be running in the first place.

Local Control and Privacy: Where the EM16P Wins

The Refoss EM16P was designed from the ground up to work without the cloud. You can block its outbound internet access entirely and still have full monitoring capability through the local Web UI, MQTT, and WebSocket interfaces. Your energy data never leaves your home network unless you choose to send it somewhere. For homeowners who care about data privacy, or who simply do not want their energy consumption patterns sitting on a third-party server, this is a meaningful differentiator.

The Vue 3 takes the opposite approach. It requires an active internet connection to function. If your WiFi or internet goes down, the device stops reporting data and the app shows no updates until the connection is restored. Data from the outage period is lost. Every reading flows through Emporia’s cloud servers, which means Emporia has a complete record of your circuit-level energy usage. Emporia’s privacy policy covers how this data is handled, but the architectural reality is that you have no option to keep it local.

Smart Home Integration: Different Ecosystems

If you run Home Assistant, the EM16P is the clear winner. It has a native integration that requires no firmware flashing, no custom code, and no workarounds. After the initial firmware update through the Refoss app, the device appears in Home Assistant’s integrations page and all sensor readings become entities you can use in dashboards, automations, and the Energy dashboard. The integration is community-maintained and widely regarded as reliable.

The Vue 3 has no native Home Assistant support. It can be made to work by flashing the device with ESPHome firmware, which gives you local access but permanently removes the Emporia app and cloud features. It is an all-or-nothing trade-off: you get Home Assistant integration but lose the polished app experience that is the Vue 3’s best feature. What the Vue 3 does offer natively is Alexa integration, which lets you ask voice questions about your energy usage and includes a smart home automation module in the box.

For homeowners who do not use Home Assistant or Alexa and just want a standalone app experience, the Vue 3 is the better choice because its app is self-contained and requires nothing else. The EM16P’s app alone is functional but less compelling; its real power only emerges when paired with Home Assistant or custom integrations.

Accuracy and Sensor Hardware

The EM16P is rated at plus or minus 1 percent accuracy. The Vue 3 is rated at plus or minus 2 percent. On a 200A panel pulling 10 kW, that is the difference between a 100W margin and a 200W margin. For most homeowners who want to identify which appliances are wasting energy and track general consumption trends, the practical difference is negligible. Both monitors will show you that your pool pump draws far more than you expected and that your basement dehumidifier runs around the clock.

Where the accuracy gap matters is solar production tracking and precise cost allocation. If you are monitoring solar panels and need to know exactly how much you generated versus consumed, the EM16P’s tighter tolerance gives you more reliable numbers over weeks and months. If you are splitting energy costs between tenants or tracking production for warranty claims, that extra percentage point of accuracy compounds into meaningful dollar amounts over time.

On the sensor hardware side, both use clamp-on CT sensors, but the EM16P’s branch circuit sensors handle up to 60A compared to the Vue 3’s 50A. This matters only if you have high-draw 240V circuits like an EV charger or electric range on a dedicated 60A breaker. The EM16P also includes an external high-gain WiFi antenna, which can help if your electrical panel is in a location with weak WiFi signal, such as a garage or basement corner.

Solar Monitoring: Both Capable, One Goes Further

Both monitors support solar monitoring and net metering, so you can see how much your panels produce, how much your home consumes, and how much flows to or from the grid. The setup process differs slightly between the two, but the core capability is the same.

The EM16P adds zero feed-in automation through its Home Assistant integration. When your solar panels produce more electricity than your home is consuming, the EM16P can automatically redirect the surplus to specific appliances rather than exporting it to the grid. This matters because many utilities pay less for exported solar than they charge for consumed grid power. By using excess solar to heat water, charge a battery, or run a high-draw appliance at the right moment, you extract more value from every kilowatt-hour your panels produce. The Vue 3 has no equivalent feature.

Installation: Similar Process, One Key Difference

The physical installation is nearly identical for both monitors. You open your electrical panel, clamp the main CT sensors around the two service entrance conductors, clamp the branch circuit sensors around the individual circuit wires you want to monitor, and connect the sensor cables to the monitoring unit. Neither requires cutting or splicing any wires. Both connect to your WiFi network (2.4 GHz only for both) and walk you through the initial setup in their respective apps.

The EM16P has one practical advantage during installation: if you clamp a branch circuit sensor facing the wrong direction (which causes negative readings), you can fix it in the software without reopening the panel. The Refoss app and local Web UI both let you flip the sensor polarity digitally. With the Vue 3, a backward sensor means opening the panel again and physically reversing the clamp. This sounds minor, but on a 16-circuit installation where you are clamping sensors in a cramped panel, getting one or two backward is common.

The Vue 3 has the edge in post-installation setup. The Emporia app walks you through labeling circuits, and the device is ready to use as soon as it connects to WiFi. The EM16P’s basic setup through the Refoss app is similarly quick, but if you want to configure the local Web UI, set up MQTT, or integrate with Home Assistant, there are additional steps that require some technical comfort.

Data Storage and Export

The Vue 3 stores all data in Emporia’s cloud indefinitely, for free, with no subscription. You can look at your energy usage from any point in the past at second-level, minute-level, or daily-level granularity depending on how far back you go. This is a truly strong feature, and it is unusual in the category. The trade-off is that you cannot export this data in a standard format, and you lose access to it if Emporia ever shuts down or changes its terms.

The EM16P stores up to 5 years of daily-level data and supports CSV export. The data volume is less granular than what the Vue 3 stores in the cloud, but you own it outright and can back it up however you want. If you run Home Assistant, all data flows into its database at whatever granularity you configure, giving you indefinite local storage with full export capability. The EM16P’s approach puts the responsibility on you to manage the data, but it also means no third party controls your access to it.

Which One Should You Buy?

The Emporia Vue 3 is the better energy monitor for most homeowners. Its app is the best in the category, its setup is the simplest, and its indefinite free cloud storage means you never have to think about data management. It turns circuit-level energy data into actionable information without requiring any technical knowledge. If you want to plug a monitor into your panel and immediately start understanding where your electricity goes, the Vue 3 is the right choice.

The Refoss EM16P is the better energy monitor for technical homeowners who want control. Its native Home Assistant integration, fully local operation, open API, and tighter accuracy make it the clear choice for anyone who runs a smart home platform, values data privacy, or wants to build custom automations around their energy data. The zero feed-in capability for solar households is a feature the Vue 3 simply cannot match. If you already run Home Assistant or care about keeping your data on your own network, the EM16P is the right choice.

Read our full assessments in the Emporia Vue 3 review and the Refoss EM16P review, or see both compared alongside installation guidance in the Best Whole Home Energy Monitors guide. For homeowners who are also considering whole-home energy management including battery backup, see our Best Home Battery Backup Systems guide. If your smart home includes HVAC efficiency as a priority, our Best Smart Thermostats guide covers the other side of the energy equation.

Frequently Asked Questions