I have been reading the gas meter, it doesn't move when gas isn't being consumed. For a 12 minute shower, water temp set at 43 degrees (Rinnai). It consumed 4.11kW (after applying the multiplyer conversion as on my bill) which is 28c. Today's lunch and dinner preparation was just over $1.00 (12:00 - 18:30). This is ex GST and ex the daily charge.
When water was being consumed the gas meter was moving smoothly, like there wasn't a delay in the spinning of the numbers.
I read on another webpage where people said they found instant gas more costly than electric cylinder too, so who's right?
March bill we used 1200kW of gas.