SolarEdge + Viessmann

What Zerofy can do with SolarEdge and Viessmann

In practice

• Hot water is the simplest heat store: Autopilot can use the hot-water boost of your Viessmann heat pump to heat water in hours with surplus.
• Zerofy can also change the room temperature of your Viessmann heat pump, so space heating can shift into sunny hours.
• A heat pump draws roughly 1–3 kW while running, which a typical SolarEdge home system (3–10 kW) can cover on sunny days.
• Zerofy gets new SolarEdge data every 5 minutes. Heat pumps shouldn’t switch often, so set a minimum runtime in Autopilot.
• Zerofy also shows your SolarEdge battery, so you can see whether surplus goes into the battery or into the heat pump.
• Autopilot uses Viessmann’s one-time hot-water charge. Because Zerofy can also set the hot-water temperature for Viessmann, you can choose how much surplus the cylinder stores: a higher setpoint holds more energy, at the cost of a somewhat lower heat pump efficiency.
• The Zerofy integration for Viessmann is in beta.

What SolarEdge and Viessmann offer on their own

SolarEdge: The SolarEdge Home Load Controller switches the SG Ready input of most air-to-water heat pumps on excess solar, with two configurable set points; it connects to the inverter via the SolarEdge Home Network and needs no ONE Controller. Vaillant heat pumps from 2018 with EEBUS can be controlled through the ONE Controller, and the SolarEdge Home Hot Water Controller feeds surplus into an immersion heater.

Viessmann: Viessmann’s Energy Management on One Base links Vitocal heat pumps, the Vitocharge VX3 battery, the Viessmann Charging Station and hot-water tanks, using an E380CA energy meter; ViCare then shows self-consumption and autarky. Third-party inverters are brought in through the Solar-Log Base Vi gateway, with compatibility per Solar-Log’s component database.

Zerofy connects the two: it reads SolarEdge production and controls your Viessmann heat pump to match, together with your other devices in one app, with dynamic tariffs and forecast-based Smart mode.

Setting up SolarEdge and Viessmann in Zerofy

1. Connect SolarEdge

Zerofy connects to SolarEdge’s monitoring cloud with the same login you use for the SolarEdge Monitoring website or the mySolarEdge app.

1. Make sure your SolarEdge inverter is online and your account has the Owner role on the site.
2. Add a new SolarEdge device in Zerofy.
3. Log in with your SolarEdge Monitoring / mySolarEdge credentials and follow the on-screen prompts.

Good to know: Your account needs the Owner role, which the installer usually assigns to the system owner during setup; ask your installer if you don’t have it. Battery and meter data depend on how your system is configured.

Step-by-step guide for SolarEdge

2. Connect Viessmann

Zerofy connects to the Viessmann cloud with your Viessmann (ViCare) account and shows a Space Heating and a Hot Water Tank device; you can adjust room and hot-water temperature, and Autopilot triggers the hot-water boost.

1. Check that the system runs on Viessmann One Base or has an Optolink interface with a Vitoconnect OPTO2 gateway, and that it is online.
2. In Zerofy, add a Viessmann device.
3. Log in with your Viessmann account credentials and follow the prompts.
4. Enable Autopilot (Solar or Smart mode) for the Hot Water Tank.

Good to know: The Viessmann integration is in beta. Flow/circuit temperature can’t be set from Zerofy, and Autopilot currently steers only the hot-water tank; space-heating control is coming.

Step-by-step guide for Viessmann

3. Turn on Autopilot

In Zerofy, open your Viessmann heat pump, turn on Autopilot and choose Solar – or Smart to also use dynamic tariffs and forecasts. Set the priority, activation threshold and minimum runtime.

Dynamic tariffs

Zerofy can also run your Viessmann heat pump on dynamic electricity prices (EPEX Spot or Nord Pool, e.g. Tibber or aWATTar) or on a fixed time-of-use tariff. Smart mode combines those prices with forecasts of your household consumption and your SolarEdge solar production.

Learn more about Smart Mode

About SolarEdge and Viessmann

SolarEdge – Israeli company (Herzliya) known for inverters with a power optimizer on every module. Homes typically have a SolarEdge Home Wave single-phase or Home Hub three-phase inverter with optimizers, often with a SolarEdge Home Battery and SolarEdge Home smart-energy accessories. Monitoring app: SolarEdge Monitoring / mySolarEdge app.

Viessmann – Viessmann is a German heating manufacturer from Allendorf (Eder). Newer heat pumps such as the Vitocal 250-A and Vitodens boilers run on the Viessmann One Base platform with built-in Wi-Fi; older Vitotronic systems go online through a Vitoconnect gateway. Products: Vitocal 250-A, Vitocal 200-S, Vitodens 200-W/300-W boilers, Vitovalor fuel cells, older systems with Vitotronic controllers.

Manufacturer information last checked: October 2026.

All devices that work with SolarEdge