Shelly
Smart home kit to switch the water heater on solar surplus, Shelly
Smart home kit to switch the water heater on solar surplus, Shelly
Kit smart home su Amazon.it · Energia e fotovoltaico · Elettricista
Regular price
€116.12
Regular price
Sale price
€116.12
Unit price
per
Indicative price: sum of the Amazon.it prices recorded on 22/09/2026. The kit is bought on Amazon, not from us.
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Indicative price: the sum of the Amazon.it prices recorded on 22/09/2026; prices on Amazon can change. Delivery, returns and warranty are shown on Amazon at checkout. As an Amazon Associate, Litio Store earns from qualifying purchases.
Smart home kit · Energy and solar
Shelly self-consumption kit: water heater on the solar surplus
The two-channel Shelly EM reads solar production and the exchange with the grid; when there is surplus, a 16A Shelly 1PM Gen3 switches the electric water heater on and off again as the sun fades. The hot water is made with energy that would otherwise go to the grid. All over Wi-Fi in the Shelly app.
Shelly devicesWi-Fi, no hub neededInstallation by an electricianBuying on Amazon.it
Kit put together by Litio Store — buy it on Amazon.it. This is one of the smart home kits in the Domotica Smart section: you buy the products on Amazon from a basket we have already filled, at Amazon's prices on the day, and we earn a small commission at no extra cost to you. For professional LoRaWAN systems see the Milesight kits in the same section; for a kit built to order, get in touch through the contact page.
Who it's forFor anyone with a single-phase solar system and an electric water heater.
What you measureInverter output and export to the grid, with history.
What you controlThe water heater, through a 16A relay with energy monitoring.
InstallationElectrician needed: meter in the consumer unit, relay on the water heater line.
What it does
- One clamp on the main switch measures the exchange with the grid, the other on the inverter output measures production.
- When export goes above the threshold you set, that is the water heater's power plus a margin, the Shelly 1PM Gen3 switches it on.
- If the surplus drops, because of cloud or because another appliance has come on, the relay switches the water heater off after the delay you set.
- The water heater's own thermostat stays active: once the temperature is reached it stops heating, even with the relay switched on.
- A backup schedule can switch the water heater on at a fixed time on days without sun.
- The app shows how much energy the water heater has taken and how much has gone to the grid.
For three-phase or very powerful water heaters, heat pumps or several loads to run on the surplus, write to us from the contacts section and we will point you to the right configuration.
1Two-channel Shelly EM on DIN rail in the enclosure next to the consumer unit, with one clamp on the main supply and one on the inverter output.
2Shelly 1PM Gen3 16A relay with metering on the water heater line, in the consumer unit or in the box next to the cylinder.
How to install it
Wi-Fi network. The kit has no hub: the Shelly EM and the Shelly 1PM Gen3 connect to the home router on the 2.4 GHz network. Check the Wi-Fi coverage near the consumer unit and near the water heater, often in the bathroom or a utility cupboard. If the signal is weak, a repeater is needed. In the Shelly app you create the account and the home.
Meter and clamps. The Shelly EM mounts on the DIN rail in the kit's 4-module enclosure and is powered at 230V. One clamp goes on the live conductor downstream of the export meter, the other on the live conductor leaving the inverter, with the arrow pointing the way the manufacturer indicates. The 230V connections in the consumer unit must be made by qualified personnel with the system isolated.
Water heater relay. The Shelly 1PM Gen3 is fitted on the water heater line, in the consumer unit or in a box next to the heater, provided the water heater's power stays within the relay's 16A. The kit includes the 4-module enclosure (2 for the Shelly EM plus spare), the ferrules for stranded conductors and the Wago lever connectors.
App and pairing. In the Shelly app, add the Shelly EM and the Shelly 1PM Gen3 with the guided procedure. Name the channels, grid and solar, and during the day check that generation reads consistently and that the exchange is negative when you export. Switch the water heater on from the app and read its power on the 1PM: you need that figure for the threshold.
Recommended automations. Create a scene: when export exceeds the water heater's power plus a margin, switch the 1PM on; if it drops back below for a few minutes, switch it off. The delay avoids constant switching when the sky is changeable. Add a backup evening schedule for cloudy days, limited to the hours you actually need.
Contents verified. The Shelly EM and the Shelly 1PM Gen3 are handled in the same app, so the export reading can switch the relay on directly. The kit includes the two 50A clamps for the Shelly EM's two channels, the 4-module enclosure (2 for the Shelly EM plus spare ways), the ferrules for the wiring and the Wago connectors for the modules.
What's in the kit
| Qty | Item | Unit price | Subtotal |
|---|---|---|---|
| 1 | Shelly EM single-phase 2-channelEnergy monitoring | 49,99 € | 49,99 € |
| 2 | Shelly 50A current clampEnergy monitoring | 17,99 € | 35,98 € |
| 1 | Shelly 1PM Gen3 16A relay with energy monitoringRelay / switch | 15,99 € | 15,99 € |
| 1 | Wago 221-413 lever connectors, 10 piecesAccessory: connections · connections for the modules | €8.99 | €8.99 |
| 1 | Electraline surface-mount consumer unit, 4 modulesAccessory: DIN enclosure · 2 DIN modules + spare space | €18.73 | €18.73 |
| 1 | Assorted crimp ferrules, 900 piecesAccessory: wiring · wiring inside the distribution board | €11.99 | €11.99 |
| Kit total | €141.67 |
Prices taken from Amazon.it on 22/09/2026: they can change, and the price shown by Amazon at the time of purchase is the one that applies.
Add the whole kit to your Amazon basket6 items, 7 units · optional parts are added from the individual linksDelivery, returns and warranty: Amazon shows these at the time of purchase.
Before you order
Do you need a hub?
No. The Shelly devices in the kit connect straight to the home Wi-Fi router and are managed from the Shelly app, on a smartphone or in a browser. Good Wi-Fi coverage is needed at the consumer unit: metal enclosures and cellars weaken it.
Does it work with Alexa, Google or Apple?
The kit is managed from the Shelly app, with charts and consumption history. Through Shelly's integrations the devices can be brought into Alexa and Google Home, for example to switch off a load by voice. Readings and energy-based automations are best kept in the Shelly app.
Do you need an electrician?
Yes. The devices mount in the distribution board or in a small enclosure next to it and connect to the 230V line: the work must be done by qualified personnel with the system switched off. The kit gives the installer the enclosure, ferrules and connectors needed for tidy wiring.
What happens if the internet goes down?
Metering carries on and the devices stay reachable from the app on the home network. Scenes handled in the cloud may not run without internet: to avoid depending on the line it is better to configure the logic locally on the devices, as stated by the manufacturer. The water heater can still be switched on from the app button on the local network.
Do I need to buy any batteries?
No. Every device in the kit runs off mains power and uses no batteries. So there are no spares to keep at home and no charge levels to check: if the power goes off, the devices stop and start again on their own when it comes back.
Could the water heater run out of hot water?
Not if you set up the backup schedule: on days without sun the Shelly 1PM Gen3 switches the water heater on at the time you pick. The water heater's own thermostat keeps controlling the temperature and its safety devices stay active.
Does it suit every water heater?
For single-phase electric water heaters whose power stays within the relay's 16A, as most domestic models do. Heavier water heaters need a contactor driven by the relay; the electrician decides. Heat pumps for domestic hot water have to be checked case by case.
What if a product is out of stock on Amazon?
It happens, especially with multipacks and newly released products. Write to us from the contacts section with the kit code and the product you can't find: we'll point you to an alternative that fits the rest of the kit, so it keeps working as described.
Why buy on Amazon?
We put the kit together and tested it ourselves, picking the parts and checking that they work together. Purchase, payment, returns and warranty are handled by Amazon: delivery times, returns and warranty are shown on Amazon at the time of purchase, item by item.
Notes
Not included
- Wi-Fi router and a repeater if needed
- Solar system, inverter and water heater
- Electrical work in the consumer unit and on the water heater line
- Contactor for water heaters above 16A
As an Amazon Associate, Litio Store earns from qualifying purchases.