@LaurieFairyCake
UPDATE
Getting really annoyed and stressed out now
It's NOT THE BOILER
I used 7Kw overnight last night with the boiler off
However we used the Lakeland heated airer all night to dry washing last night - anyone know if they're one kw an hour ?
Of course it is not the boiler , as someone else said your boiler is gas!
Re your heated dryer read this :
"Popular models currently on sale at Aldi and Lakeland are 300 watts.
But there are some that are more powerful, such as this drying pod from Lakeland which is 1,000 watts.
We asked energyhelpline.com to calculate the cost of running the 300w models, but you can use the same method to work it out for higher wattage ones.
Generally speaking the higher the wattage, the more it will cost to run.
A 300w dryer uses 0.3 kWh - a kilowatt hour is the unit of energy used for billing you electricity.
Currently, the average cost of electricity on a standard variable tariff is £0.21 kWh.
That means it's 6p per hour to run a 300w clothes airer (0.3kWh x £0.21).
If you have it on for eight hours, it would cost 48p, and over a year based on daily use, would add up to an estimated cost of just under £25.
Of course the exact cost can depend on a number of other things as well as the wattage.
The annual cost will change if you use it more or less - for example you might dry your clothes outside instead on dry sunny days.
The price will also depend on how much you pay for your electricity.
You can check with your energy supplier what your electricity unit rate is and it may be on your energy bill too.
You can use the following calculation to work out the cost of running a heated airer if you have the cost of your energy in kWh and the wattage of your dryer.
Uses 300w = 0.3 kWh
Cost per hour = £0.06 (0.3kWh x £0.21)
Cost per use = £0.48 (£0.06 cost per hour x 8 hours)
Cost per year = £24.96 (£0.48 cost per use x 52 days per year)"
According to that it is not your heated airer.
Your choice number 3 is to get a professional to look at this .