Does SoftHEAT liquid freeze?

SoftHEAT element
A SoftHEAT element is filled with heating fluid inside the Cadet plant in Vancouver, Washington.

A few people recently got in touch with our technical support team to ask if the heating liquid in our SoftHEAT baseboard heaters will freeze. The short answer to that questions is no.

Here’s the long answer:

These heaters use a non-toxic heat transfer fluid. That fluid protects itself from freezing in temperatures down to about 9 degrees Fahrenheit.  Even at that temperature, the liquid doesn’t exactly freeze. It just thickens into a gel-like consistency.

SoftHEAT baseboard heater
A Cadet SoftHEAT baseboard heater installed in a living room.

The bottom line is this: If your heater is working, there isn’t any reason why the fluid would fall to such temperatures that would cause it to freeze. If the liquid does happen to turn into gel, as soon as the heater turns on it will quickly return to its operating temperature and consistency.

If you happen to be using a SoftHEAT heater in a vacation home in an extremely cold climate, the important thing to remember is even if the fluid temperature drops to 9 degrees or below, the heater will operate as long as it has power. So you’ll be fine, even if you leave the heater off in the cold of winter. Just turn it back on when you need it and the SoftHEAT baseboard should get going in no time.

Paul Suarez

Paul Suarez

Paul is a highly caffeinated, uber organized family man that keeps himself busy finding and sharing the stories that make Cadet a great company. When he isn't writing, or shooting photos and videos, you'll likely find him searching for killer deals on Craigslist, playing classic Nintendo games or quoting his favorite movies and TV shows.

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  • m w

    Will the heater burst if left at Minus 15 degrees C for months?

    • I just double-checked with our engineering and tech support teams, and they said you should be just fine. Like we said in the post, it will get thick but it won’t freeze and it certainly won’t burst.

      -Paul Suarez, Social Media Specialist

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