Hot tub retailers have a heyday comparing their insulation with their competitors. It’s much ado about nothing in most cases.
You certainly want to avoid poorly-insulated hot tubs but the truth is for south-western BC weather, the difference between one appropriately insulated brand and another will not make a big difference. Other things such as the cover (see #17), efficiency of pumps, plumbing, outside temperature, exposure to wind and frequency of use make WAAAY more of difference than what kind of insulation your hot tub uses.
