Matter and Your Sauna - Why the New Smart Home Standard Still Has a Sauna Gap

You’ve probably seen “Matter compatible” stamped on light bulbs, locks, and thermostats for a couple of years now. You might be wondering if that means your sauna heater is finally joining the party too. Short answer: not really, not yet. Longer answer: there’s a real path to a smart, cross-platform sauna, it just runs through a hub rather than a Matter logo on the heater box.

Let me walk you through what Matter actually is, what it does well, and where it stops short of your sauna.

What Matter actually is

Matter is a shared smart home standard built by the Connectivity Standards Alliance, the industry group that also maintains Zigbee. The idea is simple even if the politics behind it weren’t: instead of every brand running its own app and its own cloud, a Matter device speaks one common language that Apple Home, Google Home, Amazon Alexa, Samsung SmartThings, and open platforms like Home Assistant can all understand.

In practice that means a Matter light switch you buy today should keep working even if you switch your phone from Android to iPhone next year, or swap your hub from one brand to another. That’s the whole pitch: less lock in, less “this only works with the manufacturer’s app.”

Matter runs over your existing Wi-Fi and Ethernet, and also over Thread, a low power mesh network designed for battery powered sensors that need to sip power for years rather than months. A door sensor or a temperature sensor on Thread can sit quietly reporting for a long time without you touching a battery.

Where sauna gear stands right now

Here’s the part that matters for you as a sauna owner: as of mid 2026, the major electric sauna heater brands, think HUUM and Harvia, still run their own proprietary Wi-Fi systems and apps rather than shipping native Matter support. If you’ve bought a HUUM heater with its Wi-Fi module, or a Harvia heater with something like the Xenio remote kit, you’re controlling it through that brand’s own app and cloud service, not through Matter.

That’s not a knock on those products. They work, and they were built for a specific job: let you start preheating your sauna from your phone before you leave the office, then hold a target temperature until you get home. But it does mean your sauna heater lives in its own silo, separate from the rest of your Matter connected house.

Meanwhile, the Matter side of the smart home has been busy. Recent revisions to the spec have added support for more device categories, camera feeds, soil and environmental sensors, EV chargers, motorized closures, on top of the lighting, locks, and thermostats that launched first. Thermostat support in particular has grown a lot: Google Nest, Tado’s radiator thermostats, Eve Thermo, budget options like Meross, and hub devices like Aqara’s Thermostat Hub W200 all now talk Matter. None of that list, notably, includes a heater built for 80 to 100 degree Celsius (176 to 212 Fahrenheit) sauna air.

So how do you actually get a smart, cross-platform sauna

If you want your sauna in the same app as your lights and locks, the realistic route in 2026 is a hub that bridges the gap, most commonly Home Assistant.

Here’s roughly how it works:

1. Your sauna heater’s own Wi-Fi module talks to its manufacturer’s proprietary API, the same one the brand’s phone app uses.
2. A Home Assistant integration (built by the manufacturer or, more often, by the community) talks to that same API and pulls the heater into Home Assistant as a controllable device: on, off, target temperature, sometimes sauna specific extras like steam or fan control.
3. Home Assistant’s core Matter support is a controller, not an outbound bridge on its own, so getting your heater into Apple Home or Google Home takes one more piece: a bridging add-on like Home Assistant Matter Hub or Matterbridge, layered on top. That add-on is what actually exposes the heater as a Matter device to those other ecosystems, even though the heater never speaks Matter directly.

This is genuinely a solid setup if you already run Home Assistant or are willing to. You get scene automations (dim the lights and start the sauna when a “sauna night” scene triggers), presence based preheating, and a single app for everything in the house. Several sauna owners have documented exactly this kind of build, wiring a heater’s Wi-Fi API into Home Assistant alongside lighting and notifications.

If you don’t want to run a hub, you’re back to the manufacturer app, which honestly does the core job fine: preheat on a schedule or with a tap, get a notification when target temperature is hit, done.

What to actually check before you buy

A few honest, non gimmicky things worth checking before you assume “smart sauna” means “Matter sauna”:

• Does the heater have an official Wi-Fi module at all? Not every heater does out of the box, and retrofitting one after the fact is more of a project than most people want.
• Is there a community or official Home Assistant integration for that specific brand and model? This is the real gatekeeper for cross-platform control, not Matter branding.
• Do you actually want cross-platform control, or just remote preheating? If all you want is “start it from my phone before I leave work,” the manufacturer’s own app already does that without any extra hub or setup.
• Are you comfortable with a bridged device occasionally lagging or dropping? Bridges add a hop. A direct Matter device tends to be snappier and more reliable than one relayed through a third layer.

The caveat worth sitting with

None of this is a criticism of sauna makers for being “behind.” Sauna heaters are a niche product category with real safety requirements around high heat and moisture, and building a certified Matter device type for that isn’t a trivial ask for a relatively small industry. The Matter spec keeps adding device categories, but it adds them where the volume is: lighting, locks, thermostats, sensors, EV charging. A sauna heater has to earn its place on that roadmap, and right now it hasn’t.

That could change. Matter’s device list has grown steadily since it launched, and thermostat support alone went from a handful of brands to a real menu of options over a couple of years. It’s not unreasonable to expect specialty heating categories, sauna included, to eventually get a proper device type. Just don’t buy a heater today expecting a Matter badge to show up on it via firmware update next quarter.

Takeaway

Matter is genuinely good news for the parts of your smart home it already covers, and it keeps expanding. Your sauna heater almost certainly isn’t one of those parts yet. If you want your sauna folded into the same ecosystem as everything else, a Home Assistant bridge over the manufacturer’s own Wi-Fi API is the practical answer today, not a Matter certified heater. And if all you actually want is to hit preheat from the office, the brand’s own app has had that covered the whole time.