@ yi.liu I’m looking for clarification regarding the Sonoff TRVZB Zigbee thermostatic radiator valve.
I keep seeing mentions online that there are two different generations of this device: an older one (often informally called “v3”), and a newer one (sometimes referred to as “v4” or TRVZB‑M). These names are not official, but users report that the two versions behave differently, especially in Zigbee networks and when used with Home Assistant (ZHA/Z2M).
I’d like to confirm a few things:
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Do two distinct hardware/firmware versions of the Sonoff TRVZB actually exist?
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What are the real differences between them?
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firmware versions
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Zigbee behavior
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responsiveness
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confirmation of system_mode
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battery life
If they do exist, how can you recognize which version you’re buying? Is there any indication on the packaging? Is the model “TRVZB‑M” an official newer revision? Can the version be identified before pairing?
From what I’ve seen, the packaging appears identical and doesn’t mention any revision or firmware information, so it seems like you’re buying “blind”. I’d appreciate any confirmed details from people who own one or both versions.