The below answer links directly to Bestway's website and is also taken directly from, which Drinkstuff have no affiliation with.
was introduced into all our models as standard starting from the 2021 range. This function allows you to keep your hot tub out all year round without worrying about it freezing or having to put it away.
When the outside temperature drops below 6°C , Freeze Shield™ activates your pump and mildly heats up your hot tub to prevent the water and pipes from freezing.