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Rank 2
January 29, 2025

iHD Red Everytime I Switch Anything On

  • January 29, 2025
  • 36 replies
  • 465 views

As per the title my IHD idles at the bottom of the green until I switch anything on in my flat even the kettle or toaster (both new) and then it goes to the top of the red. I’m only in a small 2 bed , 1 sitting room/kitchen flat and going through £300 a month in electric since moving in 2mths ago despite being out from 7.45-6 Mon-Fri and even when I’m in don’t have the TV on etc much . I don’t get why using anything is draining my electricity so much . I have underfloor heating but that’s on 2hrs a day as once I saw the bill the first month I adjusted it right down but no difference to my electricity bills 

    36 replies

    Rank 2
    January 31, 2025

    Something definitely switches on around 4am and then there are other increases around 7:30 and as you say from 13:30 for a few hours. 
    If you're sure these are actual readings rather than estimates (they can still be estimated if the system isn’t receiving full readings), then the next thing to check is if the meter number on your bill (labelled MPAN) matches your actual meter. https://www.ovoenergy.com/guides/energy-guides/what-is-an-mpan-number

    The timing of the extra usage looks like some heating or hot water (immersion heater?) 

    Do you have an off peak tariff like economy 7 (or economy 10)? 
    Some of the timings seem to correspond to those off peak time slots

    Hi no not on an off peak tarrif or economy 7. The 7.30 I could guess is when I’m up as I leave for work about then. And yeah not in until about 6-7pm for a when heating comes on when you see a spike watch occasional tv but 1hr max if that a day under 5hrs a week. In bed by 11pm until 6.30am.

    I’ll check mpan number when I get in

    juliamc
    Rank 20
    Rank 20
    January 31, 2025

    Heating and hot water will use the most energy. What are you using for these ? Do you have an electric shower ? The underfloor heating is probably a big user, depending how big the area being heated. What time of day do you have it on ?

    Cooking and the kettle, coffee machine and toaster use a lot of electricity but  for a short time. Fridge freezer will run on and off all 24 hours. TV is comparatively little.

    Firedog
    Super User
    Super User
    January 31, 2025

    ...   the next thing to check is if the meter number on your bill (labelled MPAN) matches your actual meter. 
     

    I think BP meant to ask you to compare the Meter Serial Number (MSN) on your bill with the one on your meter. The MPAN isn’t shown on the meter.

    The meter is given a serial number on manufacture. The supply to the property has an MPAN, whose ID won’t normally change. It’s allocated by the DNO. The supplier (here, OVO) is responsible for matching MSNs to MPANs and making sure the right ones are recorded in the national database. It’s sadly not unusual for a meter in a block of flats to be linked to the wrong flat.

    A smart meter has an MSN starting with the two-digit year of manufacture, so that’s the one to look for on the meter.

     

    I agree that the usage data you shared look suspiciously like those I’d expect to see on a multi-rate system, with power coming on to a switched heating circuit at 04:00 (about 3 kW), and again at 13:30. It would help a lot to see a clear photo of the meter and the backboard it’s mounted on, and also of the consumer unit (fuse box), clear enough to be able to read the labels on the breakers. Your plan page would show what sort of tariff you’re on, if you’d like to share that as well.

    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. |
    Rank 2
    January 31, 2025

    ...   the next thing to check is if the meter number on your bill (labelled MPAN) matches your actual meter. 
     

    I think BP meant to ask you to compare the Meter Serial Number (MSN) on your bill with the one on your meter. The MPAN isn’t shown on the meter.

    The meter is given a serial number on manufacture. The supply to the property has an MPAN, whose ID won’t normally change. It’s allocated by the DNO. The supplier (here, OVO) is responsible for matching MSNs to MPANs and making sure the right ones are recorded in the national database. It’s sadly not unusual for a meter in a block of flats to be linked to the wrong flat.

    A smart meter has an MSN starting with the two-digit year of manufacture, so that’s the one to look for on the meter.

     

    I agree that the usage data you shared look suspiciously like those I’d expect to see on a multi-rate system, with power coming on to a switched heating circuit at 04:00 (about 3 kW), and again at 13:30. It would help a lot to see a clear photo of the meter and the backboard it’s mounted on, and also of the consumer unit (fuse box), clear enough to be able to read the labels on the breakers. Your plan page would show what sort of tariff you’re on, if you’d like to share that as well.

    Hi 

    yes the serial number match here’s the photos I hope and of my plan . Only thing of note is the water one trips if I have more than 5-10min shower 

     

    BPLightlog
    Super User
    Super User
    January 31, 2025

    Ok, I can now see the cabling into and out of your meter. 

    It goes via connector blocks into the white ‘box’ but I can’t see what that is .. any idea?

    Or is that the consumer unit (shown in the second photo)?

    Bring me Sunshine ~ E&E {Solar PV, Battery Storage, Hybrid EV, ASHP and Home Assistant automation}
    Firedog
    Super User
    Super User
    January 31, 2025

    @BPLightlog I thought that was the CU with its lid closed.

     

    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. |
    BPLightlog
    Super User
    Super User
    January 31, 2025

    Can I ask what heats your water? If there’s an immersion heater, I wonder if its timing is right for your tariff. 
     

    There’s definitely a higher usage early morning and then again early afternoon. These are normally associated with heating and a tariff such as Economy 10 where there is an off peak rate early morning and afternoon. 
    Your other ‘high’ points are what might be expected for breakfast and evening. 
    You mention controlling the underfloor heating to a 2 hr slot .. is there a separate control for that?

    Bring me Sunshine ~ E&E {Solar PV, Battery Storage, Hybrid EV, ASHP and Home Assistant automation}
    Rank 2
    January 31, 2025

    Ok, I can now see the cabling into and out of your meter. 

    It goes via connector blocks into the white ‘box’ but I can’t see what that is .. any idea?

    Or is that the consumer unit (shown in the second photo)?

    Yes that’s the CU with the lid closed 

    Rank 2
    January 31, 2025

    Can I ask what heats your water? If there’s an immersion heater, I wonder if its timing is right for your tariff. 
     

    There’s definitely a higher usage early morning and then again early afternoon. These are normally associated with heating and a tariff such as Economy 10 where there is an off peak rate early morning and afternoon. 
    Your other ‘high’ points are what might be expected for breakfast and evening. 
    You mention controlling the underfloor heating to a 2 hr slot .. is there a separate control for that?

    The underfloor heating has its own thermostat and shows energy use attached for the week . No immersion heater 

     

    juliamc
    Rank 20
    Rank 20
    January 31, 2025

    How is your water heated ?