It thinks at home
Models run on the Hearth H1 neural core inside the box. Your prompts, transcripts and sensor history never touch a data centre.
Hearth 2 · Home AI
Intelligence that stays in the house.
Hearth is a quiet aluminium box that runs large language models, transcription and automations on its own silicon. No cloud. No subscription. Nothing you say, type or record ever leaves your Wi-Fi.
- 0 cloud calls
- 8 dB idle noise
- 4 W typical draw
Why people choose it
Six reasons it sits on the shelf, not in the cloud.
Quiet by build
Fanless aluminium. 8 decibels at idle — a hair below the hum of an empty room — and only 19 dB when every core is lit.
Private by design
No account, no telemetry, no ad IDs. The only server Hearth talks to is the one in your wall socket.
Offline by default
Internet down? Automations, transcription and the assistant keep working. Hearth never needs the cloud to do its job.
Plays well with your house
A Matter and Thread border router, an open local API and MQTT out of the box — Hearth orchestrates the devices you already own.
Sips power
4 watts in a normal day, 28 at full chat. Over a year, a Hearth uses less electricity than one kettle boil a week.
“It writes my shopping lists, my shell scripts and my bedtime stories — and the only thing it ever sends to the internet is a request for the weather.”
Kabelsalat Weekly, October review
Technical specifications
Hearth 2 · the honest numbers
Neural coreHearth H1 NPU · 46 TOPS INT8
Memory32 GB unified LPDDR5X
Models it runsOpen-weight LLMs to 30 B params · Hearth Core-7B distilled
TranscriptionWhisper-class, 12 languages, on-device
Storage512 GB NVMe (2 TB on Hearth Pro)
Microphones4-mic far-field array · hardware mute switch
Noise8 dB idle / 19 dB full load
Power4 W typical / 28 W peak · fanless
ConnectivityWi-Fi 7 · Gigabit Ethernet · Thread border router · BLE 5.4
BodyRecycled 6063 aluminium · wool-felt base · 128 × 128 × 42 mm · 640 g
SoftwareHearthOS (Linux) · local REST + MQTT API · Python SDK
Warranty3 years, parts and labour
How quiet is quiet? Decibels at one metre
Tokens per second · Hearth Core-7B (Q4)
Pricing
Three sizes. One price each, forever.
Every Hearth ships with HearthOS, the local model lab and free shipping. No subscription, ever.
Hearth Mini
For one flat, one desk.
$249one-time
- 16 GB unified memory
- Models up to 7 B params
- 2-mic array
- Matter & Thread border router
- 256 GB storage
Hearth 2
The whole house, thinking.
$449one-time
- 32 GB unified memory
- Models up to 30 B params
- 4-mic array, Whisper-class transcription
- 2× faster first token
- 512 GB storage
Hearth Pro
For big houses and small server racks.
$799one-time
- 64 GB unified memory · dual H1 core
- Models up to 70 B params
- PoE+ and rack ears
- 2 TB storage
- Priority repair in 48 h
Fleets and small offices: Hearth Studio clusters start at $1,290 per node, with the same one-time price.
Questions, answered
Frequently asked questions
Yes. Every model, automation and transcript runs on the box itself — the network is optional. You can switch Hearth into full airplane mode from the side switch and the assistant, the calendar briefings and the automations all keep working. The only things that need a connection are extras you opt into, like weather or remote access.
Hearth ships with Hearth Core-7B, our distilled assistant model, plus Whisper-class transcription and an on-device embedding store for long-term memory. You can install any open-weight model up to 30 billion parameters (70 B on Hearth Pro) from the local model lab — quantised, verified and updated over the same encrypted channel as everything else.
Nowhere, by architecture. Hearth has no cloud account to sign in to, no telemetry pipeline and no ad IDs. Conversations, transcripts and sensor history live on the NVMe drive inside the box, encrypted with a key that is fused at manufacture. If you never want the box to phone out, the airplane-mode switch makes that physical, not a policy.
8 decibels at idle and 19 dB with every core lit — about the difference between a still room and a page turning. The aluminium body is the heat sink, so there is no fan, no rattle and nothing to dust out.
Hearth is a certified Matter device and a Thread border router, so bulbs, locks, valves and sensors join directly — no hub of their own. It speaks MQTT and has an open local REST API, so Home Assistant and custom automations treat it as a first-class brain, not a walled garden.
Memory and storage are soldered to the board, because a glued-shut box is a quieter box. What we can do: HearthOS keeps a per-device model cache, so when a better model lands you download it once and every Hearth in the house learns the same trick the same evening. Three-year warranty, free shipping both ways, and a 30-day home trial.
Light the fire.
Thirty days at home, free shipping both ways, three-year warranty. If Hearth does not earn its shelf, send it back.