Smart meter installed as Economy 10 - how will this affect my cylinder water supply?

So far, realise it's early days with the setup. Deliberately used lots of hot water this morning after 4.30-7.30 heat, on checking this PM around 5, no new hot water ie from off peak heat from the afternoon hours 1.30-4.30pm. Had a check with the meter itself, button B, no option for boost at all?

That is a bit disturbing. The boost box has a lamp on it which glows when one or the other elements is active, so I suggest you check it when the main bottom element supposed to be on, bearing in mind that if it’s following the right schedule, it will start a few minutes after the nominal time. If it was switched on (‘TIMED’) but the lamp wasn’t lit when you checked at 17:00 today, something’s not right.  Check again at 21:00 and - if you’re able - at 00:30. It should be on at 21:00, but not at 00:30. Let us know what you find.

Don’t worry about it. I don’t think you’ll need it.

If you find yourself without hot water, use the boost box. Because there’s now some doubt about the way your meter is configured, you should do this only at times when you know you’re on the offpeak rate. Your IHD indicates that this is happening at the right times, with the switch from offpeak to peak taking place a few minutes after 07:30, so check that you see the same sort of ‘Next tariff’ notice before 16:30 and 20:30. If that’s as it should be, you should be safe to use the boost box during the afternoon and evening offpeak slots. It may be that your heating is coming on at midnight, so the first 4½ hours will be at peak rate. Let’s hope that’s not the case.

Your careful observations will make it possible for us to work out what you should ask Support to do. If the problem is the one it’s looking like, the fix should be quick and easy.

​@Firedog thanks again. There was no light on at 5 or 9pm on the old boost box, although it's on timed. The IHD display is on red at present i presume that means something is occurring?! Nothing else running differently to norm at this time of night. This is what i wondered would happen basically, waiting for timings to align or otherwise, that we would need to boost our water manually. It does mention tariff changes on the IHD also, upcoming so to speak, next peak should be at around 00.30 so will check, off peak around 04.30.

Meant to add too, when i messaged OVO they said the new tariff/system could take up to 6 weeks to synch up? They were unable to give me the new times/tariff details also as yet. We have hot water this morning, but i think it's heated up the cylinder based on the old e7 way ie 00.00-7am, or it has heated for 3 hours from 04.30-7.30. The engineer is kindly still around these parts so is kindly popping around to check the wiring and box etc. And yes, will use the boost box if at all needed in the pm/eve. 

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​@Firedog just to clarify the IHD does display tariff change countdowns around the expected tariff times i was initially given, the boost box light wasn't glowing at 5pm but am guessing it shouldn't be as think the PM off peak tariff slot is 1.30-4.30pm, so should glow during this time as is set to TIMED? Today I'll check jt better as fell asleep before 00.30 last night! Rock n roll.... Will check at times was given when booking the slot for sorting, which is 04.30-07.30, 13.30-16.30 and 20.30--00.30. Unsure why OVO couldn't confirm details after set up.