Very strange. We only have 1 geyser, which only runs from 02:00AM - 05:00AM (No gas afterwards for the whole day, except some occasional low pressure appearances). And we receive bill in excess of Rs. 2500 (plus Rs. 6000 on cylinder gas). When there used to be some gas, bill used to be around Rs.6000 with only 1 heater and 1 stove in addition to that geyser.
Sorry to OP for being off topic