If you use the inflatable cover and lid, that seals in the heat and stops it cooling down:
I turn the heat setting down to say 25 degrees with the cover on and let it 'tick over' between use (I use mine daily) the thermostat will maintain that and only heat the water when needed. A couple of hours before you want to use it turn the temp up to 40 (leaving the lid ON) and it will very quickly get up to heat.
It's the best way to do it as the heating element in the pump is a 2KW - 2000 watts which is like boiling your kettle continuously (watch the leccy meter spin wildly !!!!). As you have found it's pointless turning it off as it takes AGES to heat from cold
Get a bottle or two of chilled white wine enjoy and relax in your spa whilst getting trashed
PS: I bought mine from here :
http://bestwayspa.co.uk/Lay-Z-Spa_Series_2.html VERY helpful people and all original spares and accesories are available in case it goes wrong
