Updated October 2026
Data from the official Shelly site.
2026 verdict
The choice between these two Shelly relays comes down to one question: do you need to measure power?
The Shelly Plus 1PM adds built-in energy monitoring plus overvoltage, overcurrent and overpower protection on top of the same single-channel switching, dry and wet contact modes and Wi-Fi and Bluetooth control, so it is the one to buy for a water heater, immersion heater or any circuit where you want cost visibility. The Shelly Plus 1 is the plainer relay, and it suits jobs where only switching matters, such as a garage door, gate or extraction fan. Both run on the same app, integrate with Home Assistant, Alexa and Google Home, and share the same wiring learning curve. Pick the Shelly Plus 1PM when you will want energy data or extra protection, and the Shelly Plus 1 when the load is simple and that data would go unused.
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Winner
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| Feature | Shelly Plus 1 | Shelly Plus 1PM | Winner |
|---|---|---|---|
| Safety | Overheating protection | Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection | Shelly Plus 1PM |
| Energy Monitoring | NO | YES | Shelly Plus 1PM |
| Rating | 4.6 | 4.6 | Tie |
| Warranty | 3 years | 3 years | Tie |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi, Bluetooth | Tie |
| Integrations | Google Home, Alexa, Samsung SmartThings, Home Assistant | Google Home, Alexa, Samsung SmartThings, Home Assistant | Tie |
| Relay Channels | 1 | 1 | Tie |
| Dry Contact Mode | YES | YES | Tie |
| Wet Contact Mode | YES | YES | Tie |
| Zigbee Router | NO | NO | Tie |
What the differences mean
Energy monitoring
The Shelly Plus 1PM measures power and energy on its circuit, so you can see what a water heater, immersion heater or washing machine actually costs to run and automate on it. The Shelly Plus 1 has no metering at all, so it can switch a load but cannot tell you anything about its use.
Built-in electrical protection
The Shelly Plus 1PM carries overvoltage, overcurrent and overpower protection, which owners value on higher-draw circuits. The Shelly Plus 1 has none of those protections, so it suits only loads where that safety net is not needed.
What they are built for
The Shelly Plus 1PM is aimed at measured, higher-draw circuits where consumption matters, while the Shelly Plus 1 is the pick for simple switching jobs on garage doors, gates and fans, where the dry-contact mode is the point. Otherwise the two are nearly identical.
Shared ground
Both relays switch a single channel up to 16 A, support dry and wet contact modes and work over Wi-Fi and Bluetooth. Both integrate with Home Assistant, Alexa and Google Home, and neither supports Zigbee, Z-Wave, Thread, Matter or Apple HomeKit, or has a DIN rail mount.
Which one to buy if
- you want to track the energy use of a water heater or immersion heater
The Shelly Plus 1PM meters power and energy, which the Shelly Plus 1 cannot do at all.
- you want extra electrical protection on the circuit
The Shelly Plus 1PM adds overvoltage, overcurrent and overpower protection the Shelly Plus 1 lacks.
- you just need to switch a garage door, gate or extraction fan
The Shelly Plus 1 has the same dry-contact switching for those jobs without paying for metering you will not use.
- you want local, cloud-free control
Both configure over the device's own access point or Bluetooth, and the simpler Shelly Plus 1 is the cheaper of the pair for that role.
$45.00
- - Safety: Overheating protection vs Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
- - Energy Monitoring: NO vs YES
Winner
Currently unavailable on Amazon USA
- + Safety: Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
- + Energy Monitoring: YES
What owners say
Owners of both relays describe the same experience once they are wired: fast, reliable switching and smooth Home Assistant, Alexa and Google Home integration. Shelly Plus 1 owners value the dry-contact mode for garages, gates and extraction fans, the ability to switch both AC and low-voltage DC loads and the cloud-free local setup, while several mention a confusing wiring diagram and a tight fit in shallow boxes. Shelly Plus 1PM owners focus on the built-in energy monitoring, calling it accurate and useful for appliance running costs and usage-based automations, and on the peace of mind from full overvoltage and overcurrent protection; their main gripe is the occasional Wi-Fi drop.
Frequently Asked Questions
Which is better overall: Shelly Plus 1 or Shelly Plus 1PM?
The Shelly Plus 1PM is the more capable of the two because it adds energy monitoring and full overvoltage, overcurrent and overpower protection. The Shelly Plus 1 is the better buy when you only need single-channel switching, such as a garage door or a fan, and will not use the metering.
What is the difference between the Shelly Plus 1 and the Shelly Plus 1PM?
Energy monitoring and protection. The Shelly Plus 1PM measures power and energy and adds overvoltage, overcurrent and overpower protection, while the Shelly Plus 1 switches the same single channel but has no metering and none of those protections. In switching, wiring and app support the two are nearly identical.
Does the Shelly Plus 1 monitor energy?
No. Only the Shelly Plus 1PM measures power and energy. If you want to know what an appliance costs to run, or build automations on its consumption, the Shelly Plus 1PM is the model you need.
Do both work with Home Assistant, Alexa and Google Home?
Yes, both the Shelly Plus 1 and the Shelly Plus 1PM integrate with Home Assistant, Alexa and Google Home over Wi-Fi and Bluetooth. Neither supports Zigbee, Z-Wave, Thread, Matter or Apple HomeKit.
Who should buy the Shelly Plus 1PM?
Anyone automating a water heater, immersion heater, washing machine or another higher-draw circuit who wants to see and automate on its energy use, and who values the built-in overvoltage and overcurrent protection.
Who should buy the Shelly Plus 1?
Buyers whose job is simple switching, like a garage door, gate, deadbolt or extraction fan, who use the dry-contact mode and do not need energy data or the extra protections the 1PM adds.
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