Very high kwh usage for 1 person?

the meter will have a serial number. eSB network will confirm the MPRN from the serial number.

can you post a daily profile for a day you are at home one when you were away. ?

The graphs seem to confirm that you are registered to the correct meter and MPRN number which is the most important detail. Can you confirm if the readings are estimated or not on your bill?

I’ve a 200 or 320l cylinder !! With 5 people ,Including 2 teenage girls

Big demand for hot water, it’s 25. degrees now the baths was used as was showers After 40 minutes it’ll be at 50 Degrees

granted the full cylinder might be 50 as the temp prob is about 1-3 of the way up a 5ft joule cylinder

To bring a 320 litre cylinder from 25 degrees to 60 degrees it takes 13Kw of energy. Over 4Hrs of 3KW immersion run time.

To raise temperate from 25 degrees to 50 degrees in 40min would require a 14KW heat source - you won’t be doing anything like that with an immersion. An oil or gas boiler yes.

Initial screenshot 3061kWh per year and question about high consumption. Leave bills aside for now, they important, but consumer has limited control over market pricing

Consumer can , to certain degree, control usage : repair/replace faulty or inefficient appliances, use power efficient lighting, turn off non-essential/not-in-immediate use equipment

255kWh per month, perhaps high for 1person in the apartment, however, full-electric, no alternative energy sources.


Last x2 screenshots potentially indicate consumer ran immersion x2 per day, 2-3kWh for immersion is standard and normal consumption. 4kWhx30d=120kWh for hot water alone in this use pattern. Add other use(PC, lights(potentially GU10x50w down-lighters?), washing, cooking, etc) and you will get your 200-250kWh per month

OP stated absence in September2025 for 10 days - screenshot indicate steady 1.7-1.8kWh per day use during those days while no one in the apartment = parasitic/unaccounted/inadvertent consumption. OP stated that only fridge was left ON - suspect#1
50kWh parasitic power draw per month is 1/5 of the bill - i would consider this significant saving

bills come after consumed kWh.

As for "heat" produced by fridge - this might explain why OP does not use heaters :D

I watched a program where this also happened and got an electrician to call out to check , he put a clamp on her meter and asked if she would boil the kettle and no change , moved to another meter and asked to boil kettle again and it changed on a different meter and stopped when kettle shut off. Paying for someone else power does happen . Somehow something got changed and when proved she was refunded a hefty sum.

Hope you get yours fixed or someone robbing your electricity.

yes.
3kW heater , will consume 3kW per hour. Model TIH505
https://www.teslauk.com/pdf/7768.3706225.pdf

You just confirmed having faulty timer - cannot trust if left in ON position, even if you only set 15 min on boost, you dont know what is happening on the mechanical clock part, despite manual indicate should not "heat". Seek replacement if possible
https://www.tfc-group.co.uk/optimum/instructions/OP-ECOSAVE-user-installer-instructions.pdf

If you run immersion for 1.5h per day, at the rated wattage its 4.5kWh per day = 135kWh per month or half of your 2025 average monthly consumption. So that's is that.
Now look into other devices:
lights - what are those? how many, what bulb type
fridge - should have label inside, or lookup manual/datasheet/energy label by model
wash/dishwash
Cooker/hob/oven - usually rated up to 4kW
etc

Any malfunctioning device might use more than stated in annual energy sheet (fridges do ). Energy label is for guide only, it will wary by use

All devices have power rating that will give you idea how much it consume over time running.
2kW rated kettle will boil 1cup in, let say, 1min » 2/60x1= 0.07kWh per cup - perhaps dont boil half of kettle for one cup as it will take longer(use more power) and then just cool-of over time to be re-boiled again
PC+monitor could be anywhere from 100 to 300W(if gaming) - 1hour of gaming could be up to 0.3kWh » 9kWh per month

You get the idea

you could buy watt meter plug and check all your "socket" devices one by one.


Still unclear what was using ~2kWh per day in Sep2025 for 10 days, hope you'll figure and eliminate/reduce

to be honest those profiles look ok. Nothing really been used while you are away

So it’s the immersion, have you LED bulbs ? The higher immersion could also be an electric oven or hub

Looks like the immersion is the culprit.

Get an electrician in and change the timer. They are cheap and easy to install for apprentice level electrician.

See if the immersion has a "sink/bath" function. For one person, the "sink" function is more than enough power.

Negotiate/change electricity suppliers EVERY YEAR. It the easiest 30%+ saving you will make for less than 5 minutes work (MPRN number, meter reading + bank details is all you need - can take less than 3 minutes if you are quick at typing!!)

Get a day/night rate and then use the immersion timer to come on at 7am for 30-40 minutes (in the summer this can be reduced to 30 min as water coming in will be about 13 degrees versus 5 degrees at present). Water will still be warm in the evening and if needed, a 15 minute boost will probably get it hot enough on the "sink" setting.

Other things, possibly already done, make sure all lights are LED. For cooking, an airfryer & george foreman are better than oven and boiling a kettle, just boil what you need and not a full kettle.

But priority is an electrician to change the timer and also switch to the sink setting and change supplier to a discounted rate and day/peak/night rate. - You will save about €150 a month with those simple steps