Artificial Intelligence Response
Direct answer to the question
I assume you mean a MOES water-heating / gas-boiler thermostat that contains a Tuya CB3S module. In practical terms:
- CB3S is the wireless module inside some MOES thermostats.
- CB3S is based on the Beken BK7231N, so it is not an ESP8266/ESP32 module. (developer.tuya.com)
- For MOES thermostat families, the water-floor heating and water/gas-boiler versions are typically 5 A, while the electric floor-heating version is typically 16 A. (moeshouse.com)
Key points
- If you are asking about specifications, the common MOES Wi-Fi thermostat specs are around 95–240 VAC, NTC3950 10 kΩ sensor, 5–35 °C set range, app control, and Alexa/Google support. (moeshouse.com)
- If you are asking about Home Assistant / firmware hacking, treat it as a BK7231N/CB3S device, not an ESP device. OpenBeken supports BK7231N-class hardware, and Tuya Cloudcutter states that unpatched CB3S/BK7231N devices may be exploitable for cloud-free use. (github.com)
- If you are asking about wiring, first confirm whether your thermostat is GA = water floor, GC = water/gas boiler, or GB = electric heating, because the load rating differs. (moeshouse.com)
Detailed problem analysis
The phrase “moes thermostat water cb3s” mixes three separate identifiers:
| Term |
Meaning |
| MOES |
Brand / product family |
| Water |
Usually the water-floor-heating or boiler-control version |
| CB3S |
Internal Tuya Wi-Fi/BLE module |
The important engineering point is that CB3S describes the communications module, not the heating application itself. Tuya’s CB3S datasheet identifies it as a low-power Wi‑Fi module built around the BK7231N, with 2 MB flash and 256 KB RAM; LibreTiny lists the same CB3S/BK7231N combination and indicates Wi‑Fi + BLE capability. (developer.tuya.com)
From the thermostat side, MOES currently sells multiple visually similar thermostats with different electrical roles:
- GA: water floor heating, typically 5 A
- GC: water/gas boiler, typically 5 A
- GB: electric heating, typically 16 A (moeshouse.com)
That distinction matters because the 5 A water/boiler unit is not the same class of load-switch as the 16 A electric-heating unit. If someone installs the wrong version, the control logic may still appear to work while the output stage is electrically mismatched to the load. (moeshouse.com)
Typical official MOES specifications for these Wi‑Fi thermostat families include:
- Supply: 95–240 VAC, 50/60 Hz
- Sensor: NTC3950, 10 kΩ
- Set temperature range: 5–35 °C
- Display temperature range: up to about 99 °C
- Power consumption: under 1.5 W
- Installation: 86×86 mm square box or European 60 mm round box
- Smart platform: MOES / Tuya app, with Alexa / Google Home support on listed Wi‑Fi models. (moeshouse.com)
One useful correction to the sample answers: accuracy is model-dependent and MOES’ own pages are not fully consistent. The BHT‑002 product page lists ±0.5 °C, while the WHT‑006 page’s feature text says ±0.5 °C but its specification block lists ±1 °C. So you should not assume one universal accuracy figure for every “MOES water thermostat.” (moeshouse.com)
Current information and trends
As of March 6, 2026, MOES is selling several thermostat lines in parallel:
- legacy-style Wi‑Fi Tuya models such as BHT‑002 and WHT‑006
- Zigbee thermostat variants
- newer Matter Wi‑Fi thermostat variants. (moeshouse.com)
That means a “MOES thermostat” bought recently may not have the same internal hardware as an older teardown or forum post. In other words, the front panel may look similar while the radio module or firmware platform differs. The safest path is to verify the exact model code on the rear label or PCB. This is an inference from MOES’ current multi-platform product lineup, not a claim that every unit changed hardware. (moeshouse.com)
Supporting explanations and details
If your interest in CB3S is related to reverse engineering or local control:
- OpenBeken explicitly supports BK7231N-class devices. (github.com)
- Tuya Cloudcutter states that unpatched Beken BK7231N devices, including CB3S, may be exploitable for local/cloud-free use. This is not a guarantee for every thermostat, only a statement that the platform can be supported if the device firmware is vulnerable. (github.com)
- Tuya’s official BK7231N module wiring guidance shows CB3S programming connections as TXD1, RXD1, GND, 3.3 V, RST, with CSN used for the boot/IO0-style function during programming. (developer.tuya.com)
So, for firmware work, the practical engineering rule is:
- Identify the module as CB3S/BK7231N
- Do not use ESP-specific assumptions
- Try non-invasive local-control methods first
- If needed, move to 3.3 V UART flashing using the Tuya pinout. (developer.tuya.com)
Ethical and legal aspects
- These thermostats are mains-powered control devices in the 95–240 VAC class, so installation errors can create shock or fire hazards. (moeshouse.com)
- Because MOES sells 5 A and 16 A variants that look similar, using the wrong model for the wrong load is a real safety risk. (moeshouse.com)
- Reflashing firmware may affect warranty, certifications, and compliance with local installation rules. That part is a general engineering caution, not a claim from the cited pages.
Practical guidelines
If you want to identify your unit
Check the rear label or listing for:
- BHT‑002 / WHT‑006
- GA / GB / GC
- Wi‑Fi / Zigbee / Matter
- Any module marking such as CB3S. (moeshouse.com)
If you want to wire it
- Confirm whether it is water/boiler 5 A or electric 16 A first. (moeshouse.com)
- Do not assume two similar-looking MOES thermostats have identical output stages. (moeshouse.com)
- If you are uncertain about boiler input type or line-voltage wiring, I recommend using a qualified electrician.
If you want Home Assistant or local control
- For stock firmware, Tuya-based integration is the simplest path.
- For custom firmware, treat the device as BK7231N/CB3S and look at OpenBeken / LibreTiny-class tooling, not ESP-only tooling. (github.com)
If you want to flash it
- Start by determining whether your unit is still vulnerable to a non-invasive method. Tuya Cloudcutter says some unpatched CB3S/BK7231N devices are. (github.com)
- If not, use the Tuya CB3S UART pinout with 3.3 V logic only. (developer.tuya.com)
Possible disclaimers or additional notes
- “MOES thermostat water CB3S” is not one single official model number; it is a description that could refer to several product families. (moeshouse.com)
- MOES’ own published specs vary slightly between families, especially around temperature accuracy. (moeshouse.com)
- Newer MOES thermostat products include Matter Wi‑Fi variants, so do not assume every recent MOES thermostat still uses the same Tuya Wi‑Fi hardware path as older CB3S units. (moeshouse.com)
Suggestions for further research
If you want, I can help with one of these next steps:
- Wiring diagram for your exact MOES thermostat
- Identify whether your PCB really has CB3S
- OpenBeken / Home Assistant setup
- Troubleshooting if it does not switch the valve/boiler
- Pin-level flashing guide for CB3S
A clear photo of the front model number and rear terminal block / PCB would let me give a precise answer.
Brief summary
A MOES water thermostat with CB3S is most likely a Tuya-based Wi‑Fi thermostat where CB3S = BK7231N Wi‑Fi/BLE module. The water-floor and gas-boiler versions are usually 5 A, while electric-heating versions are 16 A. Typical official specs are 95–240 VAC, NTC3950 10 kΩ, 5–35 °C setpoint, and Tuya/Alexa/Google support. If your interest is firmware or Home Assistant, treat it as a BK7231N platform, not ESP, and verify the exact model before wiring or flashing. (developer.tuya.com)
If you want, send a photo or the exact model code, and I will tell you whether it is GA/GB/GC, how to wire it, and whether the CB3S can be flashed.
