It works less efficiently but it doesn't stop working.
From the article: “As a result, it boasts a reliable heating performance, enabling it to deliver a 100% heating performance in temperatures as low as -10 C.“
The freezing point of propane is -188C. So, it should continue to compress and expand just fine at extreme temperatures. It's just that the heat transfer probably gets a bit less efficient and it might not heat all the way to 70 degrees anymore or require more energy to do so.
From the article: “As a result, it boasts a reliable heating performance, enabling it to deliver a 100% heating performance in temperatures as low as -10 C.“
The freezing point of propane is -188C. So, it should continue to compress and expand just fine at extreme temperatures. It's just that the heat transfer probably gets a bit less efficient and it might not heat all the way to 70 degrees anymore or require more energy to do so.