Homematic IP compact Review: no cloud, 868 MHz, AES-128

Name: Homematic IP Radiator Thermostat Compact
Brand: Homematic IP

Homematic IP Compact (HmIP-eTRV-C) at a glance

In short: the Homematic IP Compact (HmIP-eTRV-C) scores 8,5/10 in our radiator thermostat review (from €40). Biggest strength: can be completely cloud-free. Main compromise: hub required.

All specifications come from manufacturer data sheets and the Amazon catalogue and were cross-checked before publication. The rating is an editorial overall assessment based on this data; we do not trial products ourselves.

Homematic IP Compact (HmIP-eTRV-C): what works, what doesn't?

What works well

Can be completely cloud-free: with the CCU3 no dependence on the internet
AES-128 encrypted: the highest radio security in the class
Made in Germany (eQ-3): development and manufacturing in Leer
Very stable radio connection: reliable even in large houses
Ideal for large setups: 10+ devices without problems
Tamper protection: closed housing, suitable for offices and practices
Long battery life: ~2 years with 2× AA

Points of criticism

Hub required: Access Point or CCU3 needed (€50 to 150 extra)
No Matter: cannot be integrated into Matter ecosystems
No HomeKit: Apple users left out
More complex setup: CCU3 for professionals, app for beginners

Specifications in detail

Manufacturer	eQ-3 (Leer, East Frisia)
Model	Homematic IP compact (HmIP-eTRV-C)
Device type	Wireless radiator thermostat
Wireless	Homematic IP 868 MHz, AES-128
Hub needed?	Yes (Access Point or CCU3)
Smart home	Homematic IP app, Alexa, Google
Battery	~2 years (2× AA)
Cloud	Optionally cloud-free with CCU3
Encryption	AES-128
Heating profiles	3 profiles, 6 heating phases/day
Tamper protection	Closed housing (compact)
Made in Germany	Yes
Matter	No
Valve compatibility	M30 × 1.5 + adapter
Warranty	24 months

Build quality & everyday use

What carries the Homematic IP Compact (HmIP-eTRV-C) in everyday use: can be completely cloud-free (with the CCU3 no dependence on the internet) and AES-128 encrypted (the highest radio security in the class). We have to be honest about the weaknesses: hub required. An Access Point or CCU3 is needed (€50 to 150 extra).

If you set the device up to save space, make sure it stands on a stable, level surface with some air around it. This protects the mechanics and electronics in continuous use.

“Homematic IP Radiator Thermostat Compact: can be completely cloud-free and AES-128 encrypted, and the trade-off is that a hub is required. At 8.5/10 a safe choice from €40.”

The MiniHaushalt.de editorial team

Who is the Homematic IP Compact (HmIP-eTRV-C) suited to? (buying advice)

Perfect for:

✓Privacy purists (cloud-free with CCU3)
✓Large houses with many radiators (10+)
✓Offices, practices, rental properties (tamper protection)
✓Anyone who wants Made in Germany + security
✓Smart home professionals with a CCU3

Less suitable for:

✕Apple HomeKit users
✕Matter ecosystem planners
✕Anyone who wants no extra hub (FRITZ!DECT)
✕Smart home beginners without a hub

Homematic IP Compact (HmIP-eTRV-C) compared with alternatives

Head-to-head with the top alternatives from our radiator thermostats comparison

Feature	Homematic IP Compact (HmIP-eTRV-C)	AVM FRITZ!DECT 302	Bosch Smart Home II [+M]	tado° V3+
Wireless	868 MHz HmIP, AES-128	DECT ULE	Zigbee / Matter	868 MHz + Bridge
Hub needed?	Access Point / CCU3	FRITZ!Box	Optional	Yes (in set)
Smart home	Alexa, Google	MyFRITZ!, Alexa, Google	Alexa, Google, HomeKit (Matter)	Alexa, Google, HomeKit, Matter
Battery	about 2 yrs (2× AA)	>1 heating season (3× AA)	>2 years (2× AA)	6 to 24 months (2× AA)
Matter	No	No	Yes	Yes
Price	from €40	from €50	from €40	from €150

Similar radiator thermostat models

tado° V3+ Starter Kit 9.0/10 · €150 AVM FRITZ!DECT 302 8.7/10 · €50 Bosch Smart Home II [+M] 8.6/10 · €40 Eve Thermo 2020 8.4/10 · €52

Frequently asked questions about the Homematic IP Compact (HmIP-eTRV-C)

What do I need to run it?

A hub: either the Homematic IP Access Point (for app control, ~€50) or the CCU3 control unit (for cloud-free local control, ~€150). Without a hub the thermostat cannot be used. The Access Point is the entry level, the CCU3 the professional solution.

What does “cloud-free with CCU3” mean?

With the CCU3 control unit all control runs locally in your home network, without internet and without manufacturer servers. Maximum privacy and full function even during an internet outage. With the Access Point, by contrast, control runs via the Homematic IP Cloud.

Why “compact” in the name?

The “compact” model has a closed housing without a control wheel on the device, as protection against removal and tampering. Ideal for offices, doctors' practices, children's rooms or rental properties where nobody should adjust the thermostat manually. There is also the “compact Plus” with additional tamper protection.

Is it suitable for a large house?

Yes, especially. Homematic IP is known for the most stable radio connection in the comparison, even through several walls and floors. A CCU3 controls 50+ devices without problems. First choice for large setups.

Does Alexa/Google work?

Yes, via the Access Point with Homematic IP Cloud connection. “Alexa, set the bathroom heating to 22 degrees.” Apple HomeKit and Matter are, however, NOT supported.

How secure is the radio connection?

Very secure. Homematic IP uses AES-128 encryption for all radio communication, a standard in banking and government. That is the most secure solution in the comparison and protects against outside manipulation.

8.5 / 10 · Cloud-free · Made in Germany

Verdict: is the Homematic IP Compact (HmIP-eTRV-C) worth it?

A safe choice in its class: if you can live with a hub being required, from €40 you get mainly one thing: it can be completely cloud-free. It suits best: privacy purists (cloud-free with CCU3).

If you want to compare alternatives, you will find detailed data and reviews on our radiator thermostats comparison page.

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Homematic IP compact: cloud-free from Germany