Huangming solar energy pipeline antifreeze switch is on for a long time, is it safe?

My family also uses this brand of solar energy. I use it like this: get up in the morning and turn on the hot water tap to drain the water. If I can't let it out, I'll start the antifreeze switch. Generally speaking, hot water can come down in ten minutes. After the hot water comes down, I close the hot water valve and turn off the antifreeze switch. As long as it thaws, it won't freeze all day. After all, the antifreeze belt consumes electricity, which not only saves electricity, but also is safe. I've used this for seven or eight years, and it's always working well, no problem.