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The Aqara S3 Thermostat is a touchscreen smart climate controller designed for compatible fan coil air-conditioning, water floor-heating and fresh-air systems. It combines wall-mounted temperature control with Zigbee connectivity, built-in temperature and humidity sensing and Aqara smart-home automation.
For UAE homes, apartments, hotels and commercial properties using compatible fan coil systems, the Aqara S3 can provide a modern alternative to a traditional wired thermostat.
Important: The S3 is a mains-powered thermostat and is not a universal replacement for every AC controller. The existing thermostat voltage, FCU wiring, valves and fan-speed configuration should be checked before installation.
To compare other Aqara models, browse our Aqara thermostat collection.
The Aqara S3 combines conventional thermostat functions with a modern touchscreen and connected Aqara ecosystem.
Depending on the connected HVAC configuration, the thermostat can provide temperature control together with supported fan, valve and climate functions while allowing compatible Aqara automations to be created through the Aqara Home ecosystem.
The Aqara S3 features an approximately 4-inch full touchscreen for managing climate settings directly from the wall.
The large display provides a clearer and more modern interface than many conventional FCU thermostats and can show climate information such as temperature and humidity.
The thermostat includes built-in temperature and humidity sensing.
These readings can be used by supported climate-control functions to manage indoor comfort. Aqara also allows compatible external temperature and humidity sensors to be associated with the thermostat through Aqara Home.
The Aqara S3 communicates using Zigbee and requires a compatible Aqara gateway that supports Zigbee child devices for connected smart-home functions.
Once the thermostat is connected to a compatible Aqara ecosystem, supported automations can link climate control with other Aqara devices and sensors.
| Product | Aqara Smart Thermostat S3 |
|---|---|
| Product Type | Smart HVAC and FCU Thermostat |
| Official Model | ZNWKQ11LM |
| Dimensions | 86 × 86 × 41.4 mm |
| Display | Approximately 4-inch full touchscreen |
| Wireless Connection | Zigbee |
| Rated Voltage | 220–250V AC, 50/60Hz |
| Valve Load | Maximum 100W per channel, up to three valve-load channels |
| Operating Temperature | 10°C to 40°C |
| Operating Humidity | 0–95% RH, non-condensing |
| Built-In Sensors | Temperature and humidity |
| Gateway | Compatible Aqara Zigbee gateway required for connected functions |
| Installation | Professional installation recommended |
Aqara’s official S3 manual specifies model ZNWKQ11LM, dimensions of 86 × 86 × 41.4 mm, 220–250V AC power, Zigbee connectivity, a 4-inch touchscreen and an operating range of 10°C to 40°C. :contentReference[oaicite:2]{index=2}
One of the most important applications of the Aqara S3 is control of compatible fan coil unit systems.
FCUs are common in UAE apartments, hotels, offices and commercial buildings, particularly properties using chilled-water air conditioning.
Aqara’s official wiring documentation includes several FCU configurations, including:
The official manual provides dedicated wiring diagrams for these configurations. :contentReference[oaicite:3]{index=3}
The Aqara S3 can be configured for selected compatible 2-pipe and 4-pipe fan coil systems.
However, simply knowing that a property has an FCU is not enough to guarantee compatibility. The technician should identify:
This compatibility check is particularly important before replacing an older wall thermostat.
Aqara’s official S3 wiring documentation includes support for compatible low, medium and high fan-speed connections.
This makes the S3 relevant to many FCU applications where the existing thermostat allows users to select between multiple fan speeds.
The actual FCU wiring and electrical load should still be confirmed before installation.
Unlike Nest and Ecobee models that are commonly designed around 24V HVAC control, the Aqara S3 is specified by Aqara for a 220–250V AC, 50/60Hz supply.
This distinction is important in the UAE because many fan coil thermostats use mains-powered control.
It also means the Aqara S3 should not be treated as electrically equivalent to a Nest or Ecobee thermostat.
The Aqara S3 involves mains-voltage electrical connections. Aqara’s official installation instructions explicitly state that installation involves strong electrical power and should be completed by a qualified professional according to electrical regulations and the product instructions. :contentReference[oaicite:4]{index=4}
For this reason, I would remove any “effortless installation” or DIY-style wording from the current JustCare page.
The S3 uses Zigbee connectivity rather than operating as a standalone WiFi thermostat.
A compatible Aqara gateway is therefore required for supported Aqara Home connected functions.
The gateway should first be connected and configured before the S3 is added to the Aqara Home app.
Aqara’s current developer documentation continues to list the Smart Thermostat S3 as a supported Aqara device. :contentReference[oaicite:5]{index=5}
The thermostat has its own built-in temperature and humidity sensors, but compatible independent Aqara temperature and humidity sensors can also be associated through Aqara Home.
This can be useful when the thermostat is installed near a doorway or another position that does not accurately represent the temperature in the main occupied area.
Aqara’s official instructions state that an associated external sensor can be prioritised for supported automatic temperature adjustment. :contentReference[oaicite:6]{index=6}
The Aqara S3 is not limited to fan coil air conditioning.
Aqara’s official documentation also identifies compatible water floor-heating systems as one of the equipment types the thermostat can control when correctly configured and installed. :contentReference[oaicite:7]{index=7}
The exact heating equipment and relay requirements should be checked before installation.
The S3 can also support selected fresh-air equipment configurations.
This makes it a broader climate controller rather than only a conventional cooling thermostat, although the available functions depend on how the external equipment is wired and configured.
| Feature | Aqara S3 | Aqara W400 FCU |
|---|---|---|
| Generation | Earlier Aqara thermostat platform | Newer climate-control platform |
| Touchscreen | Approx. 4-inch touchscreen | Modern touchscreen |
| Zigbee | Yes | Yes |
| WiFi | No direct WiFi-based architecture | Yes |
| Bluetooth | Not a primary S3 connection method | Yes |
| Gateway | Compatible Aqara gateway required for connected functions | WiFi provides additional direct connectivity |
| FCU Control | Compatible FCU configurations | Dedicated FCU version available |
| Smart Home Role | Thermostat and Aqara scene interface | Newer thermostat and smart control interface |
| Best For | Compatible Aqara Zigbee and FCU installations | Customers wanting Aqara’s newer FCU platform |
If you prefer Aqara’s newer climate-control platform, compare the Aqara W400 FCU Smart Thermostat.
Yes, the Aqara S3 can be suitable for compatible UAE climate-control systems, particularly selected mains-powered fan coil applications.
However, compatibility should be based on the actual system rather than location alone.
Before ordering or installation, check:
JustCare can provide professional thermostat installation for compatible Aqara S3 and AC systems.
Installation can include:
For broader installation options, visit our smart thermostat installation service.
JustCare combines smart thermostat products with practical AC and FCU compatibility guidance.
This is particularly useful with the Aqara S3 because the product has several possible HVAC wiring configurations and requires professional mains-voltage installation.
For more options, browse the Aqara thermostat range or the complete smart thermostat collection.
The Aqara S3 Thermostat is a mains-powered Zigbee smart thermostat with a touchscreen, built-in temperature and humidity sensing and support for selected fan coil, floor-heating and fresh-air systems.
Yes, it can work with compatible UAE climate-control systems. Compatibility depends on the existing thermostat voltage, FCU configuration, valves, fan-speed wiring and other system requirements.
Aqara specifies the S3 for a 220–250V AC, 50/60Hz power supply.
Yes. Aqara’s official documentation provides wiring configurations for compatible fan coil unit systems, including 2-pipe and 4-pipe arrangements.
Yes. Aqara provides wiring for compatible low, medium and high fan-speed control.
Yes. A compatible Aqara gateway that supports Zigbee child devices is required for the S3’s connected Aqara Home functions.
Yes. The thermostat contains built-in temperature and humidity sensing and can also use compatible external Aqara temperature and humidity sensors.
Aqara lists compatible water floor-heating equipment as one of the system types supported by the Smart Thermostat S3.
Yes. Aqara’s official documentation identifies selected fresh-air equipment as another supported application when correctly configured.
Professional installation is recommended. Aqara states that installation involves mains electricity and should be performed by a professional according to electrical regulations and the product instructions.
The S3 is an earlier Zigbee thermostat requiring a compatible Aqara gateway for connected functions. The W400 is Aqara’s newer climate-control platform with WiFi, Zigbee and Bluetooth connectivity and a dedicated FCU version.
Yes. JustCare can install customer-owned Aqara thermostats after checking the existing AC or FCU system, voltage and wiring compatibility.
Send JustCare a clear photo of your existing thermostat or wall controller together with the AC or FCU details. For fan coil systems, information about the number of fan speeds and whether the system is 2-pipe or 4-pipe is especially useful.
