Refreak, you seem to know your costs, here in Australia electricity is expensive and the only off peak rate is for electrical hot water and slabheating. Let's talk estimation by experience, my spa uses 2.5 kilowatts every hour so 24c x 2.5 = almost 75c, per hour, considering it will be heating 4 hours a day that's $3 per day? x that by 7 and add a few hours to get it very hot before you use it = over $20 per week.
I've heated mine more than 5 times and I still have not ran out of gas, I only use it 1ce maybe twice a week so less than $10 per week max? Please correct me on this
Also how do you think I should insulate it apart from the new cover that's arriving tommotow I purchased from austspacovers.com.au and putting the side panels back on?
Thanks guys.