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George, your friend is correct.  Gas hot tub or pool heaters do not work in below freezing conditions.  This is why you seldom see this option for hot tubs in the Northern regions.  As it gets colder out the efficiency and burning characteristics of the heater diminishes with temperatures.  We do sell gas heaters but restrict the sales of these to warmer climates or indoor installations.  The Pentair heater does have an indoor flue kit that is available for it.  This would be your best option.  Move the heater indoors or build a small heated enclosure around it and purchase the vent kit.  We also sell a hybrid heating system that uses both gas and electricity so when it is winter customers switch over to the electric heating option and reverse this for the summer. I hope this helps.   Dan  

Post By : Dan Jung Dated On : 01-08-2014