Which upvc window is best out of these

barker77

I assume they all have trickle vents?

Albermarle

https://forums.moneysavingexpert.com/discussion/comment/82086615#Comment_82086615

Normally they have to have trickle vents, whether you want them or not.

barker77

https://forums.moneysavingexpert.com/discussion/comment/82029717#Comment_82029717

ive been quoted best prices with liniar but now worried the quality isnt as good as Rehau or this one ive been recently quoted on by another company
https://www.vekauk.com/products/halo-system-10-casement-window.html

has anyone got liniar / or would reccomwnd Rehau or veka instead ?

Albermarle

https://forums.moneysavingexpert.com/discussion/comment/82098884#Comment_82098884

Rehau are a German /Swiss company and Veka are German. Both are very long established ( UPVC windows were originally produced in Germany before coming to the UK) and both produce in the UK.

Like German cars you pay a bit more for the perception of higher quality standards.

Liniar are a home grown UK company, ( grown from nothing by a local Derbyshire entrepreneur), although they were bought out by a US company a few years ago. They have a very modern factory, and have been very succesful.

As stated before they all operate to the same official quality standards, and the installation is often the weak spot rather than the windows themselves.

They probably differ in design/appearance a little, and I would go with the one I liked the look of the best.

FreeBear

https://forums.moneysavingexpert.com/discussion/comment/82087100#Comment_82087100

If the old windows have trickle vents, then the new ones must also have them fitted.

If no trickle vents are on the old windows, there are a couple of ways around not having them. Replacing 25% or less of the windows, trickle vents are not mandatory. If the windows face a source of constant noise (e.g. a motorway), you have a case for not fitting the darned things.

The regs only say "background ventilation" without specifically naming trickle vents. Background ventilation can be provided via other means such as MHRV systems. Worth reading the documents and note where it says "should" (a recommendation) and "must" (mandatory).

barker77

just tried to compare using Ai. Is it accurate / differences sway towards the liniar - company 1?

The quote from Company 1 specifies higher quality windows than the Company 2 quote across nearly all key technical areas.

Key Differences & Why Company 1 Is Higher Quality

1. uPVC Profile System

• Company 1: Uses the Liniar Sculpted profile system. Liniar is widely regarded as one of the premier UK uPVC profiles. Its multi-chambered, lead-free internal design provides high thermal retention, slimmer frame sightlines, and structural rigidity.
• Company 2: Uses the System 10 profile. System 10 (a Duraflex system) is a standard, entry-level uPVC frame system.

2. Security & Locking Hardware

• Company 1: Features SAC Shootbolt Locking combined with Stay Guard Elite security devices. Shootbolt locks physically project heavy bolts into the top and bottom corners of the frame, providing strong forced-entry resistance.
• Company 2: Uses a standard Rebated Locking System with security claws.

3. Glass & Glazing Specification

• Company 1: Uses Toughened Safety Glass ("Tuff") across standard units, combined with Soft-Coat Low-E and Low-Iron glass. Low-Iron glass eliminates the standard greenish tint found in standard glass, providing better optical clarity and higher solar efficiency.
• Company 2: Uses standard Annealed glass for most windows (which can shatter into large sharp pieces), using toughened glass only where legally required in the living room.

Technical Comparison Table

Feature	Company 1	Company 2	Advantage
Profile Brand	Liniar Sculpted	System 10	Company 1
Locking System	SAC Shootbolt Locking	Rebated Locking System	Company 1
Frame Security	Stay Guard Elite	Rebated Security Claws	Company 1
Glass Type	Toughened / Low Iron / Soft-Coat	Annealed / Standard EcoPane	Company 1
Glass Spacer	Standard 20mm Gap	Black Swiss Spacer (Warm Edge)	Company 2

Verdict: The Company 1 quote represents a superior specification in terms of security hardware, frame profile design, and safety glass clarity.

ComicGeek

Not sure how useful any of that comparison is, I feel that you're overthinking this now.

Installation quality is still going to be the biggest factor. Not just how accurately they are going to measure and manufacture the windows to avoid large gaps around the frame. But also where the windows are being installed relative to wall insulation, whether cavity closers are being installed, whether you could install insulation to the window reveals etc.

No point spending lots of money on triple glazed windows to install them in a solid brick uninsulated wall with no thought of how the two connect. It's like picking the top, top spec tyre and fitting it on an old banger with 3 other worn tyres..

Albermarle

https://forums.moneysavingexpert.com/discussion/comment/82100052#Comment_82100052

Originally you mentioned Rehau and Veka, but here you have compared Liniar to a different supplier. Anyway, Duraflex were bought for a Pound a few years ago, by a Vulture company, so probably unlikely they have developed any new products since.

barker77

https://forums.moneysavingexpert.com/discussion/comment/82100578#Comment_82100578

I asked the supplier abd they said it’s Veka. Not sure if that makes the Gemini details wrong ? Ah I see - it’s still system 10 though

Slinky

Can't give any useful information re the above, but I would recommend looking at lowered handles on casements particularly if you are replacing kitchen windows. If you have worktops in front of the windows, lowered handles mean you can actually reach the handles far more easily than the usual position, midway from top to bottom of the frame.