For engineers

Ferroli data plate: where the serial number and GC number are

By Jordan Valentine-Dunn, Gas Safe registered engineer · 14 September 2026

On a Ferroli the GC number is printed on the front cover of that model's installation instructions, and the data plate on the boiler carries the gas family and the electrical rating. The serial number sits on a separate barcoded label. Ferroli does not publish where either label is fitted, so this page gives you the numbers instead.

Schematic wall-mounted combi boiler with its data plate drawn separately beside it, ringed in brass and inspected with a magnifier

Where is the data plate on a Ferroli boiler?

Ferroli does not say, and that is worth knowing before you spend ten minutes on your knees with a torch. Twenty one UK installation manuals were read for this page, from the current BlueHelix HiTech RRT back to the Falcon, and not one of them states a position for the data plate. What they do state is what the plate carries. Every range tells you the boiler is set for either 2nd or 3rd family gas, and that this is shown on the packaging and on the data plate. Every range tells you the electrical supply must suit the maximum power absorbed by the unit as given on the dataplate. And every range tells the installer to stick the LPG conversion label next to the data plate after a gas change, which at least means the plate is somewhere a sticker can go beside it.

What Ferroli's own installation instructions say about the plate and the GC number, range by range
RangeData plate position in the manualWhere the GC number is printedManual code and date
BlueHelix HiTech RRT 24C, 28C, 34C (current UK range)Not stated. The manual names the technical data plate without ever placing itFront cover, all three models togethercod. 3541V693, Rev. 00, 06/2025
Bluehelix Tech RRT 24 C, 28 C, 34 CNot stated. Same gas family wording as the HiTechFront cover, one manual per outputcod. 3541P250, 354M1070 and 3541O990, 07/2018
Bluehelix Pro RRT 18S, 24S, 30SNot statedFront cover, a line each for the three outputsOne manual, Rev. 00, 2018, published by Ferroli UK under the Bluehelix Tech RRT name
Modena 27 C HE and 32 C HENot statedFront cover, both modelscod. 3541D054, Rev. 00, 11/2013
Modena 18 S HE, 25 S HE, 32 S HENot statedNowhere. This manual carries no GC number at all, not even in the technical data tablecod. 3541C364, Rev. 00, 12/2012
Optimax 25 C, 25 S, HE 31 C, HE 38 CNot statedFront covercod. 3544782/2, 3544696/5, 3540E64/1 and 3540F17/1
Optimax HE PLUS 31 C, 38 C, 18 S, 25 S, 35 SNot statedIn the technical data table, on the G.C. row at the foot of the column for that outputcod. 3540I885 and 3540R543, both 08/2012
DOMIcompact F 24 B, F 30 B, F 30 DNot statedFront cover. The F 24 D manual is the odd one out and carries no GC numbercod. 3540B27/3, 3540B284, 3540B62/3 and 3540B61/1
Falcon and Falcon IINot statedFront cover, under G.C. NO.3543272/0, 09/2000 and 3543544/1, 04/2005
What Ferroli publishes about each number1. On the boilerdisplayfront panelfront view?Technical data plateFerroli states no position for it.It carries the gas family and theelectrical rating, and the LPGconversion label goes beside it.Collective flue stickerattached visibly to the front panelon the BlueHelix HiTech RRT C.2. On the manual coverinstallation instructionsGC numberOn the front cover of thatmodel's manual, and on theG.C. row of the technical datatable on the Optimax HE PLUS.3. On the serial labelSERIAL NUMBERSerial numberFerroli's warranty registrationpage shows two formats,1234L12345 and 1234LE1234,and no decode for either.Schematic, not to scale. Drawn to what Ferroli's installationinstructions and warranty registration page actually state.
What Ferroli actually publishes about each number. The plate outline is dashed because Ferroli states no position for it. Drawn to the wording of the installation instructions and the warranty registration page listed under Sources.

One line from the current BlueHelix HiTech RRT manual is worth carrying onto site with you. Ferroli warns that removing the casing could cause combustion products to escape even when the unit is off. So if the number you want is not visible with the case on, the answer is the manual and the Benchmark logbook rather than a screwdriver.

What is a GC number?

A GC number is the Gas Council number, a seven digit appliance reference written as 00-000-00 that identifies one exact appliance variant rather than a range name. Ferroli prints it on the front cover of most of its UK installation instructions and, on the Optimax HE PLUS ranges, on a G.C. row at the foot of the technical data table. Two boilers can wear the same Ferroli badge, take different burners and different parts, and the GC number is what settles which one you are stood in front of. It is the identifier to write in the appliance details on a gas safety record, and our GC number hub carries the same lookup for every other make.

What is the GC number on a Ferroli boiler?

Look it up by the exact model and output, because Ferroli gives each output its own number. The Bluehelix generations are the ones most likely to be on a wall you are working on, and the tables below are read straight off the covers and technical data tables of the manuals cited under Sources. Nothing here is taken from a factor's listing.

Ferroli GC numbers for the Bluehelix generations, as printed on the manual covers
ModelTypeGC number
BlueHelix HiTech RRT 24CCombi47-267-74
BlueHelix HiTech RRT 28CCombi47-267-75
BlueHelix HiTech RRT 34CCombi47-267-76
Bluehelix Tech RRT 24 CCombi47-267-71
Bluehelix Tech RRT 28 CCombi47-267-72
Bluehelix Tech RRT 34 CCombi47-267-73
Bluehelix Pro RRT 18SSystem41-267-49
Bluehelix Pro RRT 24SSystem41-267-50
Bluehelix Pro RRT 30SSystem41-267-51

Watch the naming on the system boilers. Ferroli UK publishes that document as the Bluehelix Tech RRT 18S, 24S and 30S manual, the running header inside says Bluehelix Tech RRT, and the model lines on the cover say BLUEHELIX PRO RRT against those three GC numbers. Same book, two names. If a customer tells you they have a Bluehelix Tech system boiler, the numbers above are the ones you want.

Ferroli GC numbers for the older ranges still on walls, from the manuals in Ferroli's discontinued products library
ModelTypeGC number
Modena 27 C HECombi47-267-57
Modena 32 C HECombi47-267-55
Optimax 25 CCombi47-267-34
Optimax 25 SSystem41-267-22
Optimax HE 31 CCombi47-267-42
Optimax HE 38 CCombi47-267-43
Optimax HE PLUS 31 CCombi47-267-44
Optimax HE PLUS 38 CCombi47-267-45
Optimax HE PLUS 18 SSystem41-267-27
Optimax HE PLUS 25 SSystem41-267-32
Optimax HE PLUS 35 SSystem41-267-33
DOMIcompact F 24 BCombi47-267-37
DOMIcompact F 30 BCombi47-267-38
DOMIcompact F 30 DCombi47-267-40
FalconCombi47-267-01, printed on the cover without the second hyphen as 47-26701
Falcon IICombi47-267-24

Three of the discontinued manuals print no GC number anywhere, so there is nothing to give you: the Modena S HE covering the 18s, 25s and 32s, the Optimax 25 OV, and the DOMIcompact F 24 D. On those the plate is the only source, and if it has gone the honest entry on the record is the make, the model and a note that the GC number could not be read.

A pattern worth carrying in your head. Every Ferroli GC number found across those twenty one manuals has 267 as its middle group, with 47 in front of it on the combis and 41 on the system boilers. Ferroli built that into its own paperwork: the Benchmark page in the Optimax, DOMIcompact and Falcon manuals is preprinted BENCHMARK No. 2 6 7 and tells the installer to add the first four digits of the boiler serial number to complete it.

How old is my Ferroli boiler?

There is no published decode, so the serial number will not date the boiler on its own. Ferroli gives no year and week rule of the kind Vaillant and Worcester Bosch put in their manuals, and nothing in the twenty one manuals read for this page breaks the serial into fields. What Ferroli does publish is the shape of it. The warranty registration page shows a barcoded label captioned SERIAL NUMBER and gives two formats beside the entry box, 1234L12345 and 1234LE1234. That is enough to tell you whether you are looking at the right label, and no more. Everything else comes off the paperwork.

Start with the Benchmark logbook

Ferroli encloses the Benchmark commissioning checklist in the back of every UK manual and asks for the boiler serial number, the commissioning date and the Gas Safe register number on it. Where that has been filled in, it dates the installation exactly, and it should still be with the appliance.

Read the manual code on the book left with the boiler

Every Ferroli manual carries a code and a date on its first line, for example cod. 3541V693, Rev. 00, 06/2025. The boiler cannot be older than the revision of the book that shipped with it, which brackets the age even when nothing has been filled in.

Use the range instead of the serial

Ferroli's discontinued products library is a rough timeline in itself. The Falcon manual is dated 09/2000, the Optimax 25 C 04/2005, the Optimax HE PLUS ranges 08/2012, the Modena HE ranges 2012 and 2013, the Bluehelix Tech RRT 07/2018 and the BlueHelix HiTech RRT 04/2022. The range name puts the boiler in a decade before you touch the serial.

Check the Building Control notification

Any installation in England or Wales had to be notified to Local Authority Building Control, directly or through a competent persons scheme, and Ferroli prints that reminder on its own Benchmark page. The notification number and date settle the install date rather than the build date.

Ring Ferroli with the address

Ferroli's FAQ says to call 0330 205 0005 or email service@ferroli.com quoting the name and postcode to find out whether the boiler is still under warranty. Since a warranty has to be registered within 30 days of installation, a live registration puts the install date inside a month.

How do I check a Ferroli guarantee?

By phone or email, because Ferroli publishes no online guarantee checker. The route in Ferroli's FAQ is the customer name and the postcode rather than the serial number, which is a useful difference from Worcester Bosch and Vaillant: you do not have to get a number off the appliance to find out where a customer stands. Registering a new one is the other way round, and asks for the serial, the model, the fuel, the installation date, the installer's Gas Safe number and whether a magnetic filter is fitted.

  • The BlueHelix HiTech RRT carries seven years of parts and labour as standard, provided a high performance magnetic filter is fitted and the boiler is serviced annually.
  • Ferroli offers an upgrade from seven years to ten on the Bluehelix HiTech for 180 pounds including VAT, arranged through Installersmate or by ticking the box on the registration form.
  • The registration form warns that where no filter is fitted there is only a one year warranty.
  • The appliance has to be registered within 30 days of installation for the warranty to be valid, and the Benchmark checklist has to be completed and available on site.
  • The warranty period runs from the date the new appliance is installed and certified by a Gas Safe approved heating engineer, not from the date of purchase.
  • The online form only accepts an appliance installed less than a year ago. Anything older and Ferroli asks you to ring 0330 205 0000.

What should you copy onto the record?

  • Make and model exactly as the plate writes it, including the C or S suffix, because the output and the type both change the GC number.
  • GC number in full with both hyphens, taken from the plate where it is legible and from the manual cover where it is not.
  • Serial number from the barcoded label, which is what Ferroli will ask for on a warranty registration or a parts enquiry.
  • Gas family, since every Ferroli manual states that the plate shows whether the boiler is set for 2nd or 3rd family gas, and a conversion label beside the plate tells you it has been changed.
  • The commissioning date and notification number off the Benchmark page, which are the only dates Ferroli's own paperwork will give you.
  • A note where a number genuinely cannot be read, rather than a number worked backwards from the range name.

Only a Gas Safe registered engineer can service, size, install or certify a boiler. This is general guidance on where the identification data lives. Always work to the manufacturer's current instructions for the specific model in front of you.

A make that will not tell you where its plate is puts all the weight on the photo you take while you are stood there. Manifold's PlateScan reads the make, model and GC number straight off a data plate photo, drops them into the CP12 or service record, and keeps the appliance history against the property, so the next visit to that Ferroli starts with the numbers already filled in.

Frequently asked

Where is the data plate on a Ferroli boiler?

Ferroli does not publish a position. None of the twenty one current and discontinued UK installation manuals checked for this page states where the data plate is fitted, and there is no plate locator on ferroli.co.uk. The manuals do tell you what the plate carries: the gas family the boiler is set for, the maximum power absorbed by the unit, and the LPG conversion label stuck beside it after a gas change. Where the plate is unreadable, the GC number is on the front cover of that model's manual.

What is the GC number on a Ferroli boiler?

It depends on the exact model and output. Ferroli lists the BlueHelix HiTech RRT 24C as 47-267-74, the 28C as 47-267-75 and the 34C as 47-267-76 on the front cover of the current installation instructions. The earlier Bluehelix Tech RRT combis are 47-267-71, 47-267-72 and 47-267-73, and the Bluehelix Pro RRT system boilers are 41-267-49, 41-267-50 and 41-267-51. Every Ferroli number read for this page has 267 as its middle group.

How old is my Ferroli boiler?

The serial number will not tell you on its own, because Ferroli publishes no decode for it. Use the Benchmark commissioning checklist in the back of the manual, which carries the serial number and the commissioning date, or the Building Control notification. The code and date on the first line of the manual left with the boiler, such as cod. 3541V693, Rev. 00, 06/2025, brackets the earliest the appliance can be.

What does a Ferroli serial number look like?

Ferroli's warranty registration page shows the serial as a barcoded label captioned SERIAL NUMBER, and gives two formats next to the entry box: 1234L12345 and 1234LE1234. So it is four digits, then a letter or a pair of letters, then four or five more digits. Ferroli does not say what any of those characters mean.

How do I check whether a Ferroli boiler is still under warranty?

Call Ferroli on 0330 205 0005 or email service@ferroli.com and quote the customer name and postcode. Ferroli's FAQ gives that as the route and publishes no online guarantee checker. The warranty runs from the date the appliance was installed and certified by a Gas Safe approved heating engineer, and it only stands where the boiler was registered within 30 days, has a magnetic filter fitted and has been serviced every 12 months.

How long is the warranty on a Ferroli Bluehelix HiTech?

Seven years of parts and labour as standard, provided a high performance magnetic filter is fitted and the boiler is serviced annually. Ferroli offers an upgrade to ten years for 180 pounds including VAT, arranged through Installersmate or by ticking the box on the registration form. Where no filter has been fitted, the registration form warns that only one year applies.

Sources

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