Solved

Smart meter sizes - SMETS1 and SMETS2

  • 19 March 2018
  • 26 replies
  • 24853 views

We switched to OVO some time ago from British Gas who’d already installed smart meters. Crazily the BG smart meters can’t be read by OVO. About 18 months ago an OVO engineer came to fit new meters & we found that while the electric meter
could be swapped within the available space the gas meter couldn’t as the model OVO uses is bigger than the BG one. As we’d just finished a cellar conversion we didn’t want new cupboards etc ripped out to accommodate new OVO meters. Does anybody know if there are now smaller gas smart meters same sort of size as BG version now available?
icon

Best answer by Nancy_OVO 2 August 2018, 16:27

Updated 28/05/2020

 

Hey @GSPILLER,

I've moved your topic over here where users are talking about the same issue. I've also attached some pictures of the dimensions of each smart meter.

Electricity Meter

2cadfda7-6c47-4d73-ad7f-c48be2b5cca5.png


Gas Meter

6e92dee0-e1c4-4f93-a29f-5bbd623bacde.png


For SMETS2,

Electricity Meter:

165 mm H * 130 mm W * 63 mm D

Gas Meter
 

18ca8edd-ace2-4bbe-b388-c792f0693dd6.png

View original

26 replies

Userlevel 7
Badge +3
I have an update:

SMETS2 meters are being installed in rural Devon because I was at a mate's house this afternoon when a very nice man from OVO arrived in his Nissan EV van to fit them! Apparently this was the 14th one he's done.

Firstly, the SMETS2 units are no longer made by Secure. The ones I saw today are manufactured by Aclara. It may not matter to us end-users, but the installation commissioning sequence is different and it takes a bit longer than the SMETS1 units.

Secondly, OVO have resolved the problem of installation into semi-concealed, ground-mounted boxes for gas meters.



I have drawn two red arrows pointing to welded steel right-angled couplings which minimise the height required above the meter. the sloping lid will now close. These couplings are unique to OVO.

The blue arrow points to a steel bracket which is screwed to the plastic box and holds the meter in the correct orientation for the right-angled pipes to connect without any strain.

So that means I can now abandon my project to 3D-print a bezel which I was going to fit to my meter-box and raise the lid clearance. Whoopie!

Finally, there was a problem with the new meters causing interference with the home WiFi signals. I've uploaded details here on this other Topic.
Thanks Lucy, but this still begs the question as to who pays for a new box on the wall if the new smart meter (only an electric one in my case) won't fit in the existing one? My understanding is that companies such as OVO have an obligation to fit these meters to all properties within a certain time, at no cost to the householder?

Boxes like mine (on external walls) have been a standard fitting on new build properties for some time.
Userlevel 7
Badge +3

The SMETS2 gas meters are pretty standard size @gingertips.

 

I suspect that the digital gas meter you’re referring to is one made by Landis & Gyr, such as their G370. These were widely fitted into tight spaces, but could then only be replaced with another unit by Landis & Gyr !

 

 

Trying to figure out if an electric smart meter will fit where the non-smart is situated - it is in a difficult position. Given Transparent’s comments above: does anyone have the actual physical size of the current meters being installed; and is there any truth in wifi signal interference? If it all fell apart when the engineer arrived ie s/he decided for some reason it isn’t possible to fit a replacement, who does actually pay? thanks in advance 

Userlevel 2
Badge
Hi

Only just discovered ovo has a forum, and a decent one with good customer service too. Yay. :)

If I understand it right, it looks like our My Ovo is offering us the option to book the newer generation SMETS2 smart meter.

We live in a ground floor flat. Gas meter is in a box in the ground with a flip lid, electricity meter about 10ft away in a cupboard (with 2 other meters.) Phone signal strength fine.

Space for the electricity meter is very tight. Max width 130mm* (height is fine.)

I know that this space isn't big enough for the previous SMETS1 meter you were installing.

I've looked up the details of currently approved SMETS2 models. Some will fit, some won't, so it all depends on what make/model Ovo are installing?

Before I make the booking for the installation, is 130mm wide enough for the SMETS2 electricity meters you're now using?

There's no point me booking the install if it can't possibly fit.

Julie

_____________

* The entire useable width of the cupboard, in which 3 meters have been installed, is 370mm. Fortunately there's up to 130mm for mine (the width of my current meter) but the other two properties will be out of luck, I suspect, without serious rejigging work.
Userlevel 7
Badge +2
Welcome to the forum @jewelie

I've moved your comment to this topic - Nancy's 'best answer' has both smart meter type dimensions!

Book in your appointment here!

Feel free to send in a picture of the meter area, so us users can advise in a bit more detail!
Userlevel 7
Badge +3

Hi@Flit - I can’t give absolutely definitive answers because I don’t know where you are geographically (please fill out your Forum Profile) and the actual meters are different in the GB Territories.

I have experience with the Aclara SMETS2 electricity meters fitted in the South and Central Territories, with either SLS or Toshiba Communications Hubs. Since these two items have to fit together, the specifications are very well defined.

Here’s the dimensions of Aclara’s Electricity Meters

 

and here’s the engineering drawing of the Communications Hub which bolts on top:

 

 

This gives overall dimensions of the hardware as 130mm x 165mm as shown in this photo (apologies for poor lighting)

 

However there are further constraints such as the bend radius of the 16mm² or 25mm² wires which enter at the bottom of the unit.

 

I’ve already written about the issue of WiFi interference on another Topic here, and I suggest you read that first.

Hi and thanks for the quick and helpful reply. From your writing about WIFI, I appear to be in area 5 ie Eastern. I hope to attend to my profile in due course and will have a measure up once home. Do you know the charges if an engineer does decide s/he can’t fit the meter? cheers

 

Userlevel 7
Badge +2

No charge @Flit!! Hopefully all will be fine. 

Userlevel 7
Badge +3

Ah… I see what you mean by Area 5, @Flit.

That map is for the Electricity Distribution Network Operators (DNOs).

There are only three GB Territories for National Smart Meter Network communications. You’re in the Central one, operated by Telefonica. So your meters will send their data to/fro OVO using a modified GSM-based signalling on the O2 mobile phone network.

Userlevel 5
Badge +2
Hey Wiggo1955,

The SMETS2 model is still in the making so we’re not 100% sure, but we can say with confidence that it’s unlikely to have changed in it’s dimensions as the SMETS2 model has been designed so that is able to communicate with all suppliers.

Lucy
Userlevel 7
Badge +2
@Wiggo1955 I know that we don't know the final specs of this SMETS2 (next generation) meter just yet, so I'd rather not make any promises.

Maybe someone here knows more then us MODS and can advise a bit further.....?
Userlevel 6
Badge +4

Updated 28/05/2020

 

Hey @GSPILLER,

I've moved your topic over here where users are talking about the same issue. I've also attached some pictures of the dimensions of each smart meter.

Electricity Meter

2cadfda7-6c47-4d73-ad7f-c48be2b5cca5.png


Gas Meter

6e92dee0-e1c4-4f93-a29f-5bbd623bacde.png


For SMETS2,

Electricity Meter:

165 mm H * 130 mm W * 63 mm D

Gas Meter
 

18ca8edd-ace2-4bbe-b388-c792f0693dd6.png

Userlevel 6
Badge +4
@Wiggo1955 - This is the current model of Secure smart meter we're installing. It's the first generation (SMETS1). British Gas use a different model of meter to ours which is why they look different. Other suppliers that also use Secure meters are:

Utilita Energy Limited
OVO Energy
Co-operative Energy Ltd
First Utility Ltd
Electricity Plus Supply Ltd t/a The Utility Warehouse
Economy Energy
Toto Energy Limited
E (Gas & Electricity)
Spark Energy Supply Limited
Eversmart Energy Ltd
EON Energy
Robin Hood Energy Limited
Ecotricity
Bristol Energy
Our Power Energy Supply Ltd
Octopus Energy

@GSPILLER - The Government initiative is to phase out installations of non-smart meters by 2020, meaning after this point if customers need a meter exchange for any reason, a smart meter will be fitted. We do provide free smart meter exchanges to all customers. This is subject to appointment availability and some criteria regarding the location of the meter. There's currently no deadline by which we have to exchange all customers' meters.

Nancy
Userlevel 7
Badge +3
The situation will almost certainly change, @GSPILLER.

@Nancy_OVO has helpfully given us the drawings for the SMETS1 meters from Secure that OVO currently fit. However, these will be superceded by the SMETS2 versions, which may have different dimensions.

Moreover, OVO are not necessarily going to only install SMETS2 meters manufactured by Secure. They have experienced some mechanical problems when fitting Secure gas meters to semi-concealed boxes. So it is quite reasonable to expect that they may now reassess their requirements and source different meter hardware from more than one manufacturer.
Thanks but for clarity are you saying that the new generation meter (I assume that’s what ‘SMETS2’ is?) is probably going to be the same size as the current meters you’re fitting?
In any event I’ll wait until October to retry as apparently it will be compulsory to install second generation smart meters from then. See piece in The Observer yesterday which doesn’t paint a very good picture of the smart meter revolution! https://www.theguardian.com/money/2018/mar/26/smart-meters-rollout-installation-delays-energy-revolution?CMP=Share_iOSApp_Other
Is this the new generation of smart meters? If so gas meter stilllooks too big for cupboard space where existing old British Gas meter sits. Crazy that standards size and spec not agreed from the off
I arranged for OVO to install a smart meter some time ago. My meter is inside what looks to me like a perfectly standard box on the outside wall of my property. The engineer arrived on the appointed day and said that the new meter wouldn't fit in the box! I asked what happens now, and he said it was up to me to get a new, larger box fitted. The smart meters must be larger than the old ones.

Fitting a new box is not a DIY job and would be expensive - the mains cable would need to be disconnected. So much for free installation. When will the new universal meters become available, and will they be smaller than the ones being offered last year?
Thanks Nancy. So basically then, if the new smart meter is bigger than the current one and won't fit in the box on the wall then that's my problem as your engineer stated?

Why are Gas meters so huge?!  

I had my digital gas meter replaced a few years ago when the battery stopped working & was replaced by something that was about 1/3rd bigger & meant that the cupboard we had built at our cost had to be dissembled!  Interesting the dimensions for this so called smart gas meter isnt any different - as time moves on you expect stuff to get smaller. 

Not with gas meters I guess!

^thats much more like it.

 

So why are gas meters so huge?!!!

Userlevel 7
Badge +3

Good question @gingertips 

Mains gas passes through your meter at very low pressure - the equivalent pressure to that imparted by a 250mm high column of water.

We also have domestic devices which use very small volumes of that gas. The gas meter must be capable of registering the amount used by a pilot-light, for example.

Using a rotating device like a propeller/turbine in the gas flow is not going to be very accurate. The force required to move the blades in the gas flow is pretty high, and the bearings deteriorate over time.

The well-established method is to use a system of four diaphragms. This provides an accurate measurement based on volume, whilst remaining unaffected by particles of dust in the flow. The standard gas meter size is dictated by the four volumetric chambers inside it.

Landis & Gyr use reflections of ultrasonic pulses to detect gas flow. The return-pulse is slightly delayed if the gas is flowing.

There’s a more detailed technical explanation of ultrasonic flow measurement here on an external website.

There is also a list of the currently-approved Smart Meters here on the SmartMe site. This shows that Landis & Gyr have one approved SMETS2 gas meter, the G470-672

 

 

The 470-672 is fitted by British Gas. I’m not aware of any other Energy Supplier who uses them.

Userlevel 2
Badge
Welcome to the forum @jewelie

I've moved your comment to this topic - Nancy's 'best answer' has both smart meter type dimensions!

Book in your appointment here!
Feel free to send in a picture of the meter area, so us users can advise in a bit more detail!


Well, don't I feel silly. I read Nancy's best answer a number of times and yet never noticed the SMETS2 dimensions there. Doh.

Many thanks. 🙂

Hi, I recently had Siemens round to my new house to swap my 1st Gen smart meters (installed for the previous owners by British Gas) for 2nd Gen. The installer was able to swap the Electricity Meter easily but told me I’d have to get all my gas pipes including the main stop tap rerouted to allow them to fit the gas meter as it wouldn’t fit. 

I’ve since had a look at the above diagrams and there doesn’t seem to be much difference in size between the meter I have currently and the 2nd Gen meter. It’s mounted on a metal frame (pics to follow if the forum lets new members post them) in a spacious cupboard under the stairs, I couldn’t really see what the problem was but took the installer’s word for it.

I’m not really interested in paying a gas fitter hundreds of pounds+ to move my pipes just to save me checking a number once a month, is that really my only option to get a working Smart Meter? Are different sizes not available? Thanks!

Reply