STSS Is accurate

I have moved in last year and all I saw was just absorbent electrify bill which I started enquiring in November, gas will charge every 2 days and I was so concerned about the R46, the matter too almost 4.months.I am happy to say through their patience helping me and testing the system, it all depends on usage. I then tested it by switching the geyser and its is now every 5 days and not every 2 days.So the honour is on us.So this indicates that the system is accurate but depends on an individual usage and how they monitor that, we can save a lot.Only this month I topped up R2000 on a balance of R1000 that didnt normally happen.In the past I will be stopping on 300 of R2000 bought.