I am as baffled as you are, which is why we started keeping track of monthly readings. One of my acquaintances has a store selling electrical goods, and he too

I am as baffled as you are, which is why we started keeping track of monthly readings. One of my acquaintances has a store selling electrical goods, and he too was very skeptical. We have a refrigerator, an electric cooker, water heater, TV, a PC, and other usual stuff. I used to leave the water heater on in the winter months. A faulty thermostat in the water heater is my best guess. I'll try this hypothesis out this winter, and probably buy a new one in summer. Anyway the possible culprits are few, so hunting it down should be easy. (But the A/C unit's consumption is believable - it is rated at 1.8 units per hour, so around 5 hours usage for 30 days should push the usage up by 300 units.)