Smart meter installed/replaced today, will update if any issues. Engineer was a lovely chap, gone for economy 10 as split over 3 sections in 24 hours. Just minding on we have a 210 litre unvented cylinder which was wired to heat in the offpeak previously, this should remain the same ie heat during those new off peak timeslots? Also the old economy 7 boost box was left in situ and advised to continue using this for a boost if required (but hopeful the boosts will be less necessary if heating up the water during 3 slots during the day). There is no boost function on the new meter. See pic of meter and said boost box/new meter set up.
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- Smart meter installed as Economy 10 - how will this affect my cylinder water supply?
Smart meter installed as Economy 10 - how will this affect my cylinder water supply?
- February 21, 2025
- 49 replies
- 548 views
- Carbon Cutter*****
- 47 replies
Best answer by Ben_OVO
Hi
Thanks for creating this helpful topic. I’m really happy to hear that the appointment went well, and thank you for the kind feedback about our engineer. If you remember their name we’ll be able to pass the feedback on to their manager. Fingers crossed - Economy 10 should ensure that the water is heated up regularly enough so that the old Boost function isn’t required. I just want to link in
Keep us updated as to how it goes with your new set up. I’ve linked some handy previous topics below 👇
49 replies
- Author
- Carbon Cutter*****
- 47 replies
- February 24, 2025
Update at 7.45am, tariff has changed to peak, the symbols have switched back to what you said



- Plan Zero Hero
- 2010 replies
- February 24, 2025
Thanks, but …
We’re not really any further forward. All we know from these observations is that the heating circuit was active at 06:15 but not at 07:45, clearly established by the load control icons and the fact that at least one heating element was busily drawing something over 3.3kW at 06:49. That could have been the water immersion heater or a storage heater.
Sadly, this would have been the case whether the load control switch was configured correctly or not. The real clincher will be after midnight as I suggested, and I’m expecting you find that the tariff shown on the IHD changes at 00:40. What I hope you won’t find that at that time is the heaters charging up and the load control switches showing LC1 LC2 like they did early this morning.
The red light flashing on the meter is its impulse counter. It flashes faster when there’s a bigger current passing through the meter, so this is what you’d expect to see when the load is 3.57 kW as your IHD was showing. It will do the same when you boil the kettle or make toast. At other times when not much is happening, the IHD will show a much smaller power draw (in Watts if it’s less than 1000, otherwise in kW), and you’d get bored waiting for the red light to flash.
Flashing at 15-second intervals is 4 impulses per minute, or 240 per hour. That means that the instantaneous load when you were watching was 240W, quite reasonable if there are a few things running like fridge, freezer, lights and so on.
- Author
- Carbon Cutter*****
- 47 replies
- February 24, 2025
That makes sense
- Author
- Carbon Cutter*****
- 47 replies
- February 24, 2025
20.50 when should be in off peak mode, these symbols are on, tariff correct on IHD and the display on the meter itself. I thought this should show the other symbol during off peak guys? Again, will look at 00.40ish etc too.

- Author
- Carbon Cutter*****
- 47 replies
- February 24, 2025
Amd it's certainly not heating the cylinder/water on the PM and evening slots, enough hot water for a bath this evening, no other hot water used today.
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
Ok




- Plan Zero Hero
- 2010 replies
- February 25, 2025
OK, thank you so much for going to those lengths. It is, I’m afraid, just as I feared: the tariff is properly set in your meter to Economy 10, but its load control switch is operating on the Economy 7 schedule. I don’t suppose you noted the time when the IHD turned red, did you? I’m guessing it was at around 00:09.
This is apparently not unusual with new installations, but as you can see, it’s not the simplest thing in the world to establish it. The fix ought to be easy, too, although some customers have found that problematical, too. Let’s hope for the best.
Please call Support and ask them to send the ECAUL request to your meter to update your ALCS calendar to match the tariff timings. It might be best to use the webchat option; that way, you’re able to upload photos of your meter as proof of the misconfiguration. They will need to know the precise time you took the last photo - perhaps 00:45?
Alternatively, and a bit cheekily, if you have Latif’s number, you might call him and explain what we’ve found; with any luck, he’ll offer to call his contacts at the mother ship and get them to do the deed.
At the time of the IHD photos, you were drawing more than 13 kW. That is enough to charge three storage heaters and the hot water tank at once, and until 04:39, you’ll be being billed at peak rate. 13 kW x 4.5 hrs at 27.2 p/kWh is over £15, when it should be £12.40. And that’s just for one night.
Let’s get the meter properly set up first, then we can do some sums to work out what this switching error is costing you.
Sleep tight!
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
Thanks
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
And yes correct, it was around 10 past midnight the IHD turned red
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
Also need to get to the bottom of why the cylinder isn't heating completely based on even if it's functioning on e7 schedule, as was fine before the switch, but even if heating on peak through the night it should heat enough to last us as before?
- Community Manager
- 1055 replies
- February 25, 2025
Hey
Sorry to see this is ongoing.
Firedog has left the perfect advice here to contact the Support Team so they can send the ECAUL request.
We’ve got some related topics on the Forum where this has fixed the issue:
Let us know how you get on with that.
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
- Plan Zero Hero
- 2010 replies
- February 25, 2025
Latif has kindly contacted the 'mothership', he says that it had failed on their end after he'd done his installation and tests, which he wasn't notified of.
It’s good to hear that Latif’s still on your case, but not so good that the configuration failed.
Unsure as well why takes 6 weeks to clarify
That six-week period is just an indication of how long it might take for everything to fall into place after a complex meter exchange. It’s not just getting the meter working properly, which could take a few days. There are all sorts of changes, many of them manual, that have to be made in other OVO departments (like Billing) and also at the national database of meter information. This last stage is vital, because it underpins a lot of the other changes, and it involves third parties like data collection companies that pass details on to the database management company. So we can’t really talk about meter readings, usage figures or bills until everything is in place. The meter configuration may be a simple matter of just trying again to do what failed first time round - that often works, as I know from personal experience.
I'm in mind to contact a local sparky to check the wiring/components to the cylinder itself also.
It may come to that if things aren’t working now as they were before the meter exchange. It looks as if power should be available to the water heater for 7 hours from 00:09, and that’s plenty to heat the whole thing up. Did you check that the red lamp was lit when you did your other sleuthing in the wee small hours this morning? It’s really only the tank thermostat that could interrupt the heating process, so that’s a potential source of a fault.
Was the top of the tank not hot when you got up this morning? Why do you think it’s not heating up fully?
You can use the boost box to give a couple of hours’ extra heating during the afternoon and evening offpeak slots if necessary. The IHD will show you how long the immersion heater stays on for if you do do this - it would be interesting to learn if an afternoon boost lasted the whole maximum two-hour period.
But is there a way for reimbursement in the future if takes a while to sort?
Of course you shouldn’t be out of pocket for expenses rising from a fault with your installation. I’ll happily help you quantify the extra you may have been billed for when the time comes. This may not be until the end of next month, by which time you may have had your first bill under the new arrangement.
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
Yes, regarding the cylinder - the boost element I'll try properly today during off peak or for two hours or so to see if working properly, like you say I'm not sure why it wouldn't now be heating effectively through the night, regardless of whether peak or off peak. The chap from support said it could be that it isn't heating effectively due to changes, tripping an element or something. It is due for servicing, a local plumber did it for us last year, and is due in a couple of weeks. I know last year he cleaned out filters etc, checked thermostats etc, but said anything outwith that will be an electrician to check connections etc, I'll give him the heads up before he comes too. As ever, thankyou!
- Plan Zero Hero
- 2010 replies
- February 25, 2025
Good news, thanks 🙂 Keep us posted!
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025
Good old Latif and his mothership connections! He's been back to reset after speaking to his work/hub, to reset a few things at their end and recheck. Like say know its early days and will see is heating the cylinder efficiently, the IHD shows red which i know means everything on (during corrected off peak hours) as is heating the immersion and the storage heaters (plus usual appliances etc). I'm going to refresh myself with all things Quantum HHR dimplex heaters and how they function again!
- Author
- Carbon Cutter*****
- 47 replies
- February 25, 2025


Both taken at 20.44 at off peak charging.
- Plan Zero Hero
- 2010 replies
- February 25, 2025
Brilliant! I’m so pleased it all worked out in the end. Enjoy, and stay patient for your online account etc. to be set up and ready to help you manage your energy and save money.
- Author
- Carbon Cutter*****
- 47 replies
- February 26, 2025
Thanks all and
- Community Manager
- 1055 replies
- February 26, 2025
Hey
Glad to hear you’ve made progress with that! Thanks for coming back with that update!
Do pop back anytime if you have any further updates or questions.😊
- Author
- Carbon Cutter*****
- 47 replies
- February 28, 2025
- Author
- Carbon Cutter*****
- 47 replies
- February 28, 2025
Also i included that i have had no discussion with support, despite asking, that we were using 6 days on the wrong tariff, peak times etc.
- Plan Zero Hero
- 2010 replies
- February 28, 2025
I can only repeat what I wrote earlier: please be patient! It can take weeks for everything to settle down, including billing.
You say “we owe 900 quid”. Have you had a bill for this amount? Or are you looking at figures in your online account that will still be in a state of flux as the many changes that have to take place filter through the systems?
Once everything is in place, you can start making sure that the closing readings for the old meters and the opening ones for the new one are the ones Latif noted down and reported. He should also have left a Meter Exchange Label by the meter with those details on it. For peace of mind, make sure you have a photo of it salted away somewhere safe. I wish I had - mice ate mine.
Once the exchange readings have been applied to a bill, you can start calculating how much extra you will have been billed because your heaters were charging at peak rates some of the time.
- Author
- Carbon Cutter*****
- 47 replies
- February 28, 2025
Thanks
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