Electric combi boiler cost to run?

With the heating on very low this is the figure I’m getting seems a lot? 

It might be worth giving the manufacturers a call and asking a bit about how the system works in terms of the tank pre heating the water for the central heating if that is how it works. There is a number on their website. 

Also worth bearing in mind with a gas boiler 7kWh an hour isn't unreasonable, the challenge is electricity is 3 times the price of gas.... And some of that is normal home electricity usage.

It is the difference between gas and electricity kWh that is really hitting you i suspect 

Yeah has gone up to 9kwh now so switching it off all together for the time being! 

I suspect it will drop once the house temperature is stable just like a gas boiler.

But having a chat with the manufacturer first before testing out for a few days feels like the right thing to do.

It isn't going to be cheap, but our old house won't be cheap to heat tonight with a gas boiler given the fall in temperature outside 

It is quite cold now outside... 

I’ve just looked at the so-called Instruction manual for one model and it’s appalling. Do you have a manual ? which model do you have ? Do you have an E7 off peak tariff you can get it run up to temp on ? Where do you live ?

As your system has a thermal store it's designed to be charged on cheap rate electricity, overnight. You should have a timer control that allows this (I found the manual online that shows how to do this). I'm prepared to bet that your system is trying to charge at the moment, hence the high electricity use. Once it's stored all the heat it will release it to the house as required.

By switching it off you're delaying the charge cycle so I would expect it to start again when you turn it back on.

I would find the manual and read up how to control the system. It can't be operated in the same way as a gas boiler. Are you on a tariff with cheap overnight electricity?

 I skim read the manual and stopped as it is not a quick read... Interestingly on another page on their website it says the best option is a single rate tariff.…

I wonder if it is charging or topping up the charge?

Is it clear how the charging and discharging works? I can't tell how clever or not it is.

Much more interesting than a lot of the customer queries we get 😊

Ah. So it must keep running all throughout the day then ☹️ Surely once it’s got a full tank it shouldn’t need 7-9 kW ?? That’s what my car charger uses !!

Interesting but expensive!

I've had a look at the rest of the manual and it isn't very good. Link here https://thermaflowheating.co.uk/downloads/

This is what the off peak timer control looks like.