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Rank 5
February 19, 2025
Solved

why is my electric costing £10 a night? storage heaters

  • February 19, 2025
  • 17 replies
  • 1180 views

I have a new smart meter and I’m newly on Economy 9. I have 4 newish Dimplex storage heaters. One is larger and a medium one and two smaller ones. As well as an immersion water heater. The meter replaced a faulty meter which was preventing the correct tariff working. 
I’m on pay as you go  

However I’m finding that it’s costing usually over £10 a night. I have checked and the majority of this is used at night and I can see the usage during the night is approximately £1.25 per hour and then drops to about 10p per hour during the day. It just seems excessive as it’s almost £300 a month for a 2 bedroom house!

I have tried switching off the immersion heater or 2 of the heaters but this resulted in no hot water and an expensive reheating of the tank the next night and didn’t really make much difference. I’m assuming that the other heaters then used more electricity because the temperature was lower. 
 

No gas in my area 
 

Can anyone please help? 

Best answer by Firedog

Updated on 10/06/25 by Abby_OVO

You’re quite right - that’s quite wrong!

That is the standard variable PAYG tariff, single rate, so yes, your meter isn’t properly configured at least as regards the tariff. It could be that the switching times aren’t right, either (offpeak 04:00-07:00, 13:00-16:00 and 20:30-23:30).

This is the tariff you should be on:
  

Economy 9 plan for DD8  
Prices exclusive of VAT

Can you see when your heaters are charging up - an indicator lamp that lights up when the power is on? If there’s no indicator, can you hear when they switch on? Storage heaters often start creaking a bit as the metal parts heat up and expand. They should be coming on sometime between 13:00 and 13:30 and again between  20:30 and 21:00. 

Please check the times as precisely as you can, then come back and tell us. We can then say what you have to ask Support to do. 

 

New Pay As You Go customers will be sent their tariff details in their welcome email when they set up an account. It’s important to always check the pan details to make sure they’re correct. If anything looks wrong, you can contact our PAYG Support Team.

 

 

17 replies

juliamc
Rank 20
Rank 20
February 19, 2025

Someone will help.. can you post a photo of your meter, showing what is displayed on the screen and say what time you took the photo. Also what postcode area are you, first part is enough.

BPLightlog
Super User
Super User
February 19, 2025

If the readings you’re seeing are actual rather than estimates (that can still happen with a smart meter), then it sounds like your off peak times are wrong. The whole idea of any of the economy tariffs is that you use more at a lower cost to charge up your heaters and then they’re giving out heat during the higher cost times without taking power. 
As Julia mentions, a photo of your meters and immediate wiring might give a clue but we have seen a few examples of the peak and off peak registers being the wrong way around. 

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Abby_OVO
Community Manager
Community Manager
February 19, 2025

Hey ​@Flora48 

 

Sorry to hear about this.

 

I’m glad to see a couple of our volunteers have already stopped by, it would be helpful if you could share the photos/details they’ve asked for.

 

It sounds like your tariff may not be set up correctly, and that it may be charging all usage to 1 rate, instead of a day and night rate. Your meter should be sending 2 readings, a day and night reading.

 

We don’t have access to accounts here at the Forum so it’s hard to tell this for sure, but it sounds likely based on the information you’ve provided. If you’ve already raised a complaint about this issue, I would ask them to reinvestigate this so they can correct it. If you’ve not already raised a complaint about this, we’d recommend doing that so they team can look into this for you.

 

 

Keep us updated with how you get on.

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Flora48Author
Rank 5
February 20, 2025

Hi to everyone who has helped. Today I discovered despite being told my night rate was approximately 16.5p per hour it’s still actually 25.45 at 5am this morning!


This has already almost financially crippled me. I have today sent an email to the person who was handling the now closed complaint regarding the previous issue as he was the one who phoned me and told me the tariff. My postcode is DD8 by the way. 

Firedog
Super User
FiredogSuper UserSolved
Super User
February 20, 2025

Updated on 10/06/25 by Abby_OVO

You’re quite right - that’s quite wrong!

That is the standard variable PAYG tariff, single rate, so yes, your meter isn’t properly configured at least as regards the tariff. It could be that the switching times aren’t right, either (offpeak 04:00-07:00, 13:00-16:00 and 20:30-23:30).

This is the tariff you should be on:
  

Economy 9 plan for DD8  
Prices exclusive of VAT

Can you see when your heaters are charging up - an indicator lamp that lights up when the power is on? If there’s no indicator, can you hear when they switch on? Storage heaters often start creaking a bit as the metal parts heat up and expand. They should be coming on sometime between 13:00 and 13:30 and again between  20:30 and 21:00. 

Please check the times as precisely as you can, then come back and tell us. We can then say what you have to ask Support to do. 

 

New Pay As You Go customers will be sent their tariff details in their welcome email when they set up an account. It’s important to always check the pan details to make sure they’re correct. If anything looks wrong, you can contact our PAYG Support Team.

 

 

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |
Firedog
Super User
Super User
February 20, 2025

PS I just had another look. There is no plan available in DD8 that has an offpeak rate as low as 16.5 p/kWh, so I can’t say where the advisor who called you was getting his information from. You can see all the available plans here: Our prices | OVO Energy. Be sure to use the filters (Electricity, Multi-rate, Pay as you go) to cut down the number of irrelevant plans shown.

I suspect that you’ve been put wrongly on an Economy 7 plan with day/night rates the same. That would tally with “I can see the usage during the night is approximately £1.25 per hour and then drops to about 10p per hour during the day.”

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |
Flora48Author
Rank 5
February 20, 2025

Dear lovely people who are helping me. I checked and the day rate is the same as the night rate. I have noticed that the immersion water heater which I was previously told needs to have a signal from the meter to switch on is switching on and off at the correct times. This has only happened since the new smart meter was installed. I have just phoned the OVO complaints team as I did have a complaint and at the end the last phone call from them was to say that the tariff previously mentioned was applied (or not!). I was unable to speak to the original person dealing with the complaint but was told that this would be resolved soon as in tonight by a “switchback “.   I was then hurried off the phone call with no further explanation. I then googled switchback and it says that this is when a smart meter is changed to a traditional meter. I’m really hoping this is not what is happening although I’m very doubtful that this will be happening by this evening! I definitely don’t want a traditional meter installed as I need to be on pay as you go. 
 I also questioned the tariff  I had written down the tariff I mentioned earlier when it was quoted to me by the complaint handler. I normally don’t pay attention to tariffs but because of the appalling recent situation with OVO I now pay attention to everything they say! I did not receive an answer and I have to wait until Monday for the advisor to call me back  

Advice please?

Firedog
Super User
Super User
February 20, 2025

… the immersion water heater which I was previously told needs to have a signal from the meter to switch on is switching on and off at the correct times.
 

Thanks. By ‘the correct times’, you mean the times I quoted earlier - 04:00-07:00, 13:00-16:00 and 20:30-23:30? If so, that’s an encouraging sign - it means your meter’s switch for the heating equipment is working as intended for Economy 9. As regards water heating, it may actually be overkill, depending on how big your hot water tank is and how much you use each day. If you don’t use a whole tankful each day, it may be too much to have it reheating for the six daytime offpeak hours; in many houses, much of that heat only goes to keep the starlings warm in the roof. It normally takes an average immersion heater only two or three hours to heat the tank up from cold, and if it’s reasonably well insulated, it should stay hot enough for a day or two. 

You didn’t mention the storage heaters - are they following the same schedule as the immersion heater? They should be ...

All that remains is to get the right tariff on to your meter, so don’t let them baffle you with obscure terms like ‘switchback’. Tell them you opted for Economy 9, and that’s what you expect to get, with the rates in my earlier screenshot. You may want to do some sums to see how much extra you’ve been charged by not being on the tariff you expected, then ask for that back.

Good luck!  

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |
Flora48Author
Rank 5
February 20, 2025

Excellent advice. I was told by the complaints person that economy 9 was between 11.30pm and 7.30am and that’s the time I hear the water heater switching on  I don’t have any lights at the storage heaters to see if they are charging at the same time  I did manually change the charging times on the storage heaters to this time a couple of weeks ago when I was investigating what the issue could be but of course now I know why it made no difference  OVO did say they would fix it today so I hoping that the tariff changes at midnight to the correct one whatever that’s meant to be like it was supposed to happen a month ago! 
 

Thanks again for your very useful advice 

 

 

Firedog
Super User
Super User
February 21, 2025

  

I was told by the complaints person that economy 9 was between 11.30pm and 7.30am and that’s the time I hear the water heater switching on  

OVO did say they would fix it today so I hoping that the tariff changes at midnight …
 

Economy 9 is a plan giving nine hours of offpeak electricity in three 3-hour slots, one during the night, one in the afternoon and one in the late evening. I’m not sure what your complaints handler was referring to.

If your water heater is switching on at 23:30, then what I wrote earlier doesn’t apply. I really hope that OVO’s fix today will get you sorted out, but my confidence level isn’t high …

Next time you have to contact Support, I’d suggest using webchat rather than the phone. That way, you can get a written record of what was actually said, not just your recollection of it. I can hardly believe that a complaints handler would say something so wrong as “economy 9 was between 11.30pm and 7.30am” so I’m wondering what your conversation actually consisted of. There must be a misunderstanding somewhere.

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |