The app works and I can turn the Sauna off and on and set a schedule as advertised. Unfortunately that’s about all it can do. If it’s cold outside and your sauna takes 46+ minutes to heat up then you have to turn it completely off then back on to be able to get in your 15+ minute session. This is a huge problem. If you don’t pay attention to the amount of time remaining from the hour allowed then you will go in and the sauna will turn off on its own. I understand it’s a safety feature but you should be able to add time without having to completely turn it off and on again. The app also lacks simple abilities like being able to see how long it’s been heating up, it will only show you how much time is remaaining after it’s reached the set time. There’s no way to incorporate Siri. Would be nice to be able to use Siri Shortcuts but the app doesn’t allow it. Seems like the developers did the bare minimum and have just left it at that. The actual harvia heaters are amazing but this app falls well short of the heater.

The app is functional to turn the system on and off. A very helpful feature would be to add a notification or alarm once the system has arrived at the proper temperature. The variance in external ambient temperature results in different times to heat - which can result in wasted time. Please consider a notification or alarm option. Thanks!

The app works fine and it makes it super convenient to turn on ahead of time and be ready when you’re looking to jump in. Also, the auto start they have it turned on at some point in the future is also great. Like others have said I would like to be able to add time without having to turn it off and back on again.Also, the app maxes out at 195 even though the sauna can go hotter. Not sure if there’s a way to increase that. I have my sauna connected through Home Assistant as well and there I’m able to raise it to 205 or more (I don’t go hotter than 205°). All in all it does what it needs to, having integration and some other little niceties would make it even better.

I originally left a one star review. But after calling the Sonic company and having them help me set up remote start on the unit I’m giving it five stars. It is incredible. I said it on my phone for whatever I want the sauna to heat up. I would absolutely recommend this.