Warmcore Aluminium Windows

Photo of author

Nick Dardalis

Updated on

In 2015 we saw the introduction of the Warmcore Bifolding Door. Warmcore folding doors feature a new breed of ‘warm aluminium’ marketed as a heavily insulated bifolding door with impressive U Values and performance.

It was logical that a range of windows would follow. Synseal Extrusions have now added to the Warmcore folding door, with Warmcore Aluminium Windows.

Warmcore Aluminium Windows.

warmcore residential windows.
Warmcore aluminium windows offer great aesthetics, excellent U Values and are very well designed.

What has become apparent with Warmcore is how many manufacturers and installers want to sell this brand. We know established window businesses that have set up separate operations purely to supply Warmcore. We are even aware of key people at Synseal that have left the company to pursue new ventures specifically to do with Warmcore. Rarely have we seen the window industry embrace a product in this way, the most notable being the superb Residence 9 pvcu window.

Many of the established trade suppliers in the industry have added Warmcore bifolding doors and Warmcore windows to their product range. Installers are also adding it to their showrooms. Do your research and you will see a significant number of new and white label websites dedicated to the brand. Credit to Synseal Extrusions for introducing a new breed of aluminium that many want to sell.

The double glazing blogger website and only one other have referred to Warmcore as a hybrid window. This is an incorrect description and opinion about Warmcore. A hybrid is a combination of different materials (as is Warmcore) but for windows specifically, a hybrid is regarded as having a different material on the inside and outside.  Whether the technical or Wikipedia type descriptions of hybrid generally (when not referring to windows) becomes relevant is another matter.  Warmcore windows have the same material inside and out. It is the core that is different. This method of insulating a window, in reality, is no different to the polyurethane thermal core found in Senior PURe windows.

The same could be said of the polyamide thermal break found in the majority of aluminium windows.  In our professional opinion, the Warmcore window is very much an aluminium window and if we were pedantic about it arguably a composite window as well – but certainly not a hybrid.

the orange core you see in marketing pictures will not be visible on finished products and on windows, it is black.
The orange core you see in marketing pictures will not be visible on finished products and on windows, it is black.

Other websites have also referred to the Orange PVCu profile found in Warmcore, saying “WarmCore is made using an orange PVCu multi-chambered profile”.  This is not strictly correct either as the finished door does not show it.  For clarity, on a Warmcore door, a section is used to cover up the orange extrusion.  On a Warmcore window, a black extrusion is used – it isn’t orange.

Had the orange marketed profile remained, you would see this around the inside perimeter of doors and outside of the sashes whenever you opened the doors. David Wigley, Head of Marketing at Synseal also confirmed this to us.

Synseal Extrusions, the company behind this window (and their manufacturers or resellers), do reinforce our view.  Synseal further reinforces our belief by referring to Warmcore as an aluminium window throughout their websites and marketing materials.

David Wigley also mentioned to us that Synseal sees that the end user customer is buying into a new type of ‘aluminium window experience’ and not a hybrid one.

Warmcore windows provide what many aluminium windows do not.

picture of warmcore tilt and turn window.
The tilt and turn window is a great addition to the Warmcore product offering.

Despite the growth in contemporary aluminium windows, modern doors and a trend towards modern aesthetics, the consumer still wants a traditional looking window.

This is logical given that many of us live in older and established homes. While we may extend the back of the house with a modern extension, the front of the house often needs to retain its original features. Windows are an essential part of a home.

Warmcore has done what Liniar has achieved with their Alumina bifolding door. That is the provision of a window system that is in line with the familiar PVCu aesthetic. In addition to this you can also choose a contemporary looking window as well.

Warmcore windows are also available as a flush sash casement and a tilt and turn window as well.

Warmcore windows join a general shift in the window industry.

pvcu thermal break in a window
The large thermal core found on Warmcore windows is what gives its low U Values.

We have seen it with Senior PURe windows, Origin aluminium windows and others. That is a change to more thermally efficient windows and those that are designed to be future proof. With ongoing changes to the Building Regulations, systems companies are developing windows that are intended to surpass current and future U Value requirements. Warmcore windows combine the aesthetics, durability and desirability of an aluminium window with excellent U Values and performance. Synseal claim Warmcore offers 25% better insulation than a polyamide thermally broken window.

Ultimately a window company wants to sell and a consumer wants to buy aluminium windows that look right. U-Values, security and weather performance do matter. However aesthetics is what sells windows. The Warmcore window is a very attractive window in its various variants and especially when chosen as a flush casement window.

In their marketing material Synseal correctly point out that the weakness of aluminium is the aluminium itself. Aluminium is a good conductor. The window industry addressed this with thermal breaks. These over the years have got larger.

Modern aluminium windows now often feature a thermal break that takes up the majority of the section. Warmcore took this concept several stages further. Warmcore has a PVCu thermal core that is as big as it can get. The result is an aluminium clad window but still an aluminium window nonetheless.

As a result Warmcore windows offer a U Value of 1.3Wm2K for a double glazed window and 0.8Wm2 for a triple glazed window. Current Building Regulations call for a U Value of 1.6Wm2K. By comparison, the Senior PURe window can achieve 0.71Wm2K and the Origin Aluminium window 0.9Wm2K.

Features of the new Warmcore Window.

As you would expect from a modern aluminium window, Warmcore comes with several features found on all modern aluminium windows.

  • Multi-point locking
  • Internal Glazing Beads
  • 10 year guarantee (offered by most installers, not by Synseal/Warmcore)
  • Huge colour choice thanks to polyester powder coating
  • Dual colours if desired.

There are also other features offered by other aluminium window systems such as a choice of frame and vent. Also on offer are cill options, handle colour options and

the choice of outer frames and beads creates a flexible and versatile aluminium window.
The choice of outer frames and beads creates a flexible and versatile aluminium window.

Warmcore windows also offer features not found on many aluminium windows.

  • A choice of an overlapping or flush sash.
  • A choice of beads
  • A different corner construction
  • Better sealing of mitre joints.

Additionally, Warmcore windows offer several advantages over some other aluminium window systems. To the surface finish, the aluminium profiles are coated with a thickness of 70-80 microns. This exceeds many standard powder coat finishes on offer.

All in all, the Warmcore aluminium window is a very attractive aluminium window, uses cutting edge construction and offers flexibility and choice. Large and small windows can be created and there is a matching range of doors available including the bifold.

It is clear the window industry has embraced the Warmcore product. If you currently sell aluminium windows we recommend adding Warmcore to your existing ranges. The window industry and consumer choice risks becoming stale. Visit any good window showroom and the popular AluK or Smarts systems will often be on offer. Warmcore can complement these very good systems with an option that provides something different in the way it looks, how it is designed and made. It provides the trade and homeowners with another quality window to consider overall.

Images courtesy of www.warmcore.co.uk

Providing expert help to homeowners and trade professionals since 2010




Get Free help finding the right products from the best suppliers

16:42 30 Oct 23
Nick responded incredibly quickly to my enquiry (on a Saturday too!), and was able to offer invaluable advice on both aluminum systems and manufacturer / suppliers. Thanks Nick!
chris steerchris steer
16:18 09 Oct 23
Had a meeting with Nick during the grand designs show. Was extremely helpful and professional would highly recommend
Chris WesthorpChris Westhorp
19:55 13 Sep 23
Extremely helpful with pointing us in the right direction to find the products we required and suggesting firms that could reliably fit them.Nick was quick to reply and very detailed in his advice.Highly recommend reaching out to them.
Cathy GreenwoodCathy Greenwood
07:03 11 Sep 23
Update - A second email to nick for help on bifolds resulted in a detailed informative reply even on a Sunday ! This guy is so knowledgable and helpful .I approached Nick for an independent view on sliding doors v bifold and the different brand options . His reply was extremely detailed and prompt and allowed me to navigate this often confusing world in a much more informed way . Thanks so much Nick
Anthony CraigAnthony Craig
12:45 05 Sep 23
This is a must site for anyone looking for advice. Great service and very quick answers to questions. Nick has been of great help quiding us through the maze of aluminium products. Thank you
Philip DuffieldPhilip Duffield
20:24 26 Jul 23
I contacted Nick @ ATS for guidance on what aluminium sliding door systems would be suitable for an opening in an extension that is going to be both wide and tall. He came back really quickly with very detailed and incredibly helpful advice. He is clearly extremely knowledgeable about the systems on the market and their respective features and capabilities. If you’re feeling a bit lost by the overwhelming range of choices out there, I’d definitely recommend contacting him.
Dariush HekmatDariush Hekmat
17:25 19 Jul 23
Nick's advice is great. He is always quick to respond and spends time on responses, which really help to make an informed decision.
Alan FosterAlan Foster
07:51 12 Jul 23
Absolutely fantastic. Asked for advice about replacing Crittall (?) windows late last night and early this morning received 3 great suggestions and contact information for suppliers
Rachel LauRachel Lau
09:24 16 Jun 23
Fantastic website full of valuable and pragmatic advice about product selection and comparison: no other website gives information like this. Truly written for public interest. Don't hesistate to reach out to Nick via the mailing system. He responds very quickly, is friendly, and has very sound and high knowledgable advice. I have already shared this with my friend planning her own grand design.
guard Charlieguard Charlie
12:28 14 May 23
I emailed this company just on the off chance they could help me with new magnetic sliders for my patio door. They were not able to supply those but were so very helpful providing me with the name of a company who could. I am so very grateful at the great service. Dare say customers must be very happy. thank you so much.
Benjamin LewisBenjamin Lewis
10:06 04 May 23
Nick is very helpful indeed. Extremely knowledgeable on bifolds which was in relation to my query. Great website as well, some very useful articles. Particularly appreciated the article that lists all the major bifold options in order of their sightlines! Thank you!
P JonesP Jones
08:07 15 Apr 23
I asked Nick some questions about an installation we were considering and he replied within hours with some very useful suggestions that will probably lead us to using a different make and supplier. Thanks, Nick. Great work.
Nicholas WallNicholas Wall
13:18 02 Apr 23
Looking for fair and honest expert advice on all aspect of aluminium windows and doors? These guys will arm you with all the information you need to make the RIGHT choice in a highly complex, crowded marketplace. post a question and you will get a very quick professional answer you can rely on being based on fact. Thanks guys!
Giorgia SiriacoGiorgia Siriaco
16:25 21 Mar 23
After a lot of research to find doors that would meet our unusual size requirements and feeling increasingly uncertain about the best way to spend our small budget, I stumbled on the ATS website, and I'm so glad I did! I contacted ATS to request advice and Nick promptly replied with a wealth of information, providing us with options and relevant contact details. I only wish I'd found them sooner!
Carol NortonCarol Norton
10:01 17 Mar 23
I've been so confused about how to achieve the look I'm after, and going round in circles with various window/door companies, trying to get away from the huge chunks of plastic currently around my windows. I didn't expect an email to a company found through a Google search to really help - but I was desperate, so I tried. I'm SO glad I did. Finally I have clear explanations from ATS of where I've been going wrong, exactly what I'm looking for, and a list of local companies that might be able to provide it! The response has excelled my expectations and I feel as if I'm finally inching closer to a home with which I'll be happy and comfortable: thank you.
David NunnDavid Nunn
20:54 14 Mar 23
It is rare that I write reviews, however after my very positive communication with Nick - enquiring about suitable slim sash aluminium windows for my project, I felt that a review was definitely warranted. I can reinforce the many positive reviews posted so far, Nick was very quick to respond, providing comprehensive detail, with excellent independent advice.In summary, great service, thank you Nick.
Chantal AuerbachChantal Auerbach
13:04 09 Mar 23
Nick from Aluminium Trade Supply was incredibly helpful informative and pleasant to deal with. He responded quickly to emails and was very knowledgeable. Highly recommend being in touch with Nick if you are considering new aluminium windows or doors.
Lee JonesLee Jones
20:21 22 Feb 23
I dropped Nick at Aluminium Trade Supply an email re high security slim sightline bi-folds and their alternatives and he responded that quickly (and so comprehensively) that I felt bad I’d not paid him for his time!Nick Sir your product knowledge is outstanding and you are providing a level of service that goes wayyyy above and beyond expectations. I’ll definitely make sure I mention Aluminium Trade Supply to anyone I encounter looking for a fenestration solution 🙏🏼
15:13 13 Feb 23
We are looking to replace some old UPVC patios doors with aluminium ones. The ATS website is a great source of advice in an area where clear information is sorely lacking. Having used the website, I then followed this up with a number of specific questions relating to our search, and Nick came back very quickly with clear, detailed and very useful advice.I have been very impressed with both the website and with Nick's advice. My only regret is that I didn't come across ATS before replacing various windows in 2021 - I'm sure it would have saved me a lot of grief and money! Thanks again Nick.
Azza McCabeAzza McCabe
17:47 01 Feb 23
So impressed with this company.Responded to my query quickly andgave valuable advice. Nick was extremely helpful and we were able to move forward with our project.
Adri LoloçiAdri Loloçi
11:21 08 Jan 23
Nick was super fast to respond and provided some great recommendations. I would recommend this website to anyone looking to find bifold or sliding aluminium doors.
Stephen HoustonStephen Houston
16:16 03 Jan 23
Looking for aluminium crittall style internal door and external patio French doors. Noted good reviews and thought would ask for advice. Comprehensive reply with excellent independent advice and lists of fitters who could provide products and installation. Great service.
Inga GeachInga Geach
08:25 21 Dec 22
Nick from Aluminium Trade Supply has been extremely helpful with navigating the jungle that is aluminium glazing for our upcoming extension project. His advice was prompt, detailed and always impartial. Very grateful for your input, thanks Nick!
Amanda BurtonAmanda Burton
10:54 16 Dec 22
Brilliant website and an excellent service. Nick provided not only detailed advice and supplier contacts, but highlighted the considerations of various products so I could make an informed choice. Our Sunvista minimal sliders were fitted this week and I couldn't be happier, stunning. Thanks once again for your advice and recommendations, invaluable!
Keith BarnesKeith Barnes
17:18 10 Dec 22
Very helpful advice given to my question, including the name of 3 different companies that i could try for the product being enquired about. Many thanks
Munim ChowdhuryMunim Chowdhury
11:45 13 Sep 22
Nick has been very helpful on signposting me to a number of partner organisations for steel/aluminium doors.
SUSAN wallaceSUSAN wallace
17:26 31 Aug 22
My experience with this firm was exceptionally good and this is notalways the case as a female, dipping a toe into technical waters.I was spoken too with courtesy and at a level that helped me consolidate what was needed .On top of that I was given a list of companies and places where I could obtain the type of product I needed.I could not thank them enough and would certainly go there again and reccommend others do too.
Paul SalterPaul Salter
22:39 22 Aug 22
Contacting Aluminium Trade Supply is like contacting the Oracle direct. Advice is always comprehensive and balanced. On multiple occasions they have provided me with options that fully meet our objectives. Many thanks.
Nick McCormackNick McCormack
20:25 14 Aug 22
Really helpful and useful came back to me on a Sunday with some invaluable information. Highly recommended.
ray addisonray addison
13:14 14 Aug 22
received a prompt reply to my query,and helpful information from ATS