im wondering if your landlord also has relatives living close to you that may be sharing the water (and hot water) therefore your water heater may never be off. be interesting to know how big the element is in your hot water system (watts), and also the size of your water pump (either in amps "A" or watts "w") Also wondering what your pool pump timer setting are. how many hours per day is this on. Ask your pool man to get these details for you if possible. Also ask him to get the size of the hot water system and pump for you (if you can get the message through to him). I have a 3 bed 3 bath villa with a 3.5 x 9m pool and water purification system - average bills when villa is using all rooms / aircons are around 1.1 mill a month (5500w meter) - but I do have cheap hot water from my reverse cycle aircon water hater and also all LED low wattage lighting.