ok can you please provide the units consumed in old condo and now in new condo? what was the 6-mth average?

this might indicate much higher a/c consumption than before due to lack of insulation. try to meter your regular usage for a week as suggested and then try (if you can tahan) one week without any a/c. compare the figures to find out your a/c portion of the bill.

1200 units is a lot. i a/c 24/7 (but insulated very well) and use all appliances (washing machine, dishwasher, pc, fridges, tv, etc etc.) in approx. 9 units per day per 1000 sqft living space (ceiling height is 12 ft). thats an average for hot/cold season over a couple of years. but this is running all on as energy efficient appliances as i can find (LED lights, inverter a/c, AAA+ or higher rating). if you calculate the volume of your house (and maybe the old) you can also get an estimation of how much A/C you probably need by default. then the lack of shading etc. will greatly increase concumption too.

then at least do it for a day when its not too hot and not too cold so you can an estimate. there is no way around if you really want to know. alternative you can buy voltmeter(s) to plug between the power points and gather data. if you want consumption to go down or find the culprit you need to be willing to search for it.

calculate the volume of the house is easy:

ceiling height x widh x space of each room in sqft gives cubic feet. you only need to do this for the rooms that you are airconditioning at the moment. open door = adjoining room is also aironditioned.

then you do the same for the old place. see how much volume difference you have. this will already give you an idea. for the lack of shading etc. you can possibly also expect that the power needed to cool down to the same temperature caneasily be anywhere between 10-30% more consumption.

i am pretty sure its the A/C thats causing the pain.

forgot to double check with you:

Electrolux clothes dryer = +/-6 hours a week
Rubine brand built in oven which I use +/-5 hours a week
Deep oil fryer (no brand) which I use +/- 1 hour a day

those (same) items you used roughly the same in the old house right?

This post has been edited by PJusa: Jul 8 2015, 03:49 PM

ok first of you have rooms which are roughly 20% larger. hence for the same temperature you need factoring in other factors mentioned about 30-40% more cooling power. but the inverter is set to 26° vs. 21° on non-inverter which should totally offset this.

250sqft is no problem for a 1HP aircon if the place is not super-badly insultated. are the rooms under the ceiling (how hot is the ceiling)? this might be a problem. windows - do they leak air a lot?

put a power meter between each a/c to see daily consumption to pinpoint. it could be a/c problem (running full force for whatever reason), too much heat from ceiling or walls, bad insulation or all. the other things wont contribute much to justify 40 units a day. i would guesstimate (!!) 10-15, tops 20 units go to ur non-A/C appliances. the rest is A/C.

if its 40 units then you consume 1200 units per month. that's too much. ideally you should actually be looking at no more than 10+ units for everything non-ac and about 10-15 units for the aircons. that translates into 600-750 units per month and is still on the high side but approx. what you used before as well. from you info your bill is almost 750 RM which means you used almost 1500 units (kWh).

1500 per month = 50 units per day. that is almost 2x what you should be looking at.

what was the number for yesterday?

just because a device is switched on, doesnt mean its consuming the max. wattage its rated for. that's a foolish assumption. esp. a storage heater will only work if the temperature has fallen below a certain level. even if you leave the switch on 24/7 you only pay for keeping the water warm which will be way way lower than the above. even if on for 5 hrs, its not 5.8kW * 5 but way way less than that.

well from your monitoring you use 33 kWh per day which is line with your old consumption and usage pattern. 49 would mean either you used something else for that bill or your billing cycle was not 30 days but maybe 45 or more? maybe you want to double check the bill.

sorry but this is not correct and i am sure this was only your assumption not a meassurement. your boiler does not run full force when on until you off. its just not the case. no need to argue about it. install a meter for just the heater and come back.

the thing is for two days you act more aware and safe power. you need to monitor longer. when you start to be less caring you get the real figures again. do it longer. water heater and pump will have a small effect only maybe 2-3 kWh per day depending on the amount and length of the hot showers and stuff you take. mostly hot water will be a factor. you can switch to gas heater if you like. way cheaper in the long run.

dont be silly. all storage heaters work the same. they only differ in the quality of insulation and wattage (i.e. how long it takes to get the hot water from zero).

other consumer or the worlds least efficient water heater. one more time: water heaters dont continously heat water. pls try to understand how they work. there is no way a normal (i.e. not 1000l) water heater will use 6-8 kWh over say 8 hrs to keep water at 55° or whatever your setting is. especially not in the tropics where the storage has an ambient of approx. 30°. thats just bs.

wow you really dont want to understand this it? first of even your calculation is completely useless. 3 boils for 1 hour? come on? who believes that? where got? if you boil like that after one hour the water is gone to steam. pls think first.

so this calculation bears absolutely no relevance. others told you already how the heater works. if you refuse to accept this reality i cant help you. believe what you want. some believe in unicorns, some believe their waterheater has 3 boilings a day and each boil uses 2.5kwh. heck some even believe in the flying spaghetti monster. so if it calms you down, believe it. it has however no relation to reality in any way.