LandVac launches the UK’s first 25‑year vacuum‑glazing warranty
Warranty vs Guarantee: know the legal difference A guarantee is an assurance that a product will meet a stated standard; if it fails, […]
Warranty vs Guarantee: know the legal difference
A guarantee is an assurance that a product will meet a stated standard; if it fails, the maker must repair or replace it. It is free and runs alongside your statutory rights under the Consumer Rights Act 2015.
A warranty is a separate contractual promise that can last longer, set stricter performance benchmarks and spell out extra remedies (replacement, refund or compensation). In UK law it is enforceable even when the item changes hands.
LandVac now offers a 25‑year warranty. That is the longest and most comprehensive cover on any vacuum‑insulated glazing (VIG) sold in Britain and any glass unit ever sold!
How the major vacuum‑glazing brands compare
| Product (UK market) | Years covered | Availability |
|---|---|---|
| LandVac VIG | 25‑year warranty | Stocked through approved UK installers |
| Fineo | 20‑year warranty | Nationwide distribution |
| LuxWall Enthermal | 20‑year warranty | Pilot schemes, import only |
| HaanGlas VIG | 15‑year warranty | Direct import |
| Panasonic Glavenir | 10‑year warranty | Specialist import to UK |
| Pilkington Spacia | 10‑year warranty | Discontinued in UK; still produced by NSG for Asian market |
Key point: LandVac is the only VIG brand in Britain backed by a 25‑year warranty.
People also ask
How long does vacuum glazing last?
Independent and in‑house trials confirm LandVac’s longevity:
- Natural sunlight monitoring: more than 100 units mounted outdoors since 2012. After eight years the vacuum pressure in every pane remained steady.
- Xenon‑arc accelerated ageing: 22,500 hours under a xenon lamp (equal to 25 years of real weathering). No loss of vacuum was detected.
- Temperature cycling: 10,000 cycles with one face alternated between 25 °C and 75 °C. The centre‑pane U‑value stayed constant.
In short, the glass keeps its vacuum seal and its insulation for at least 25 years, with no measurable drop in performance or clarity.
Is vacuum glazing better than slimline double glazing?
Yes. Vacuum glazing is thinner, delivers U‑values down to 0.34 W/m²K (centre‑pane) and therefore performs more than five times better than the 1.9 W/m²K typical of slimline units. It also carries a warranty that outlasts slimline double‑glazing by a decade or more.
Why slimline double‑glazing cannot keep up
Both vacuum glazing and vacuum insulated glazing have both been deemed “generally acceptable” in Historic England’s latest carbon efficiency guidance, however they are not of equal quality.
Slimline (also called narrow‑cavity) IGUs were a clever stop‑gap before something better was developed. Today the compromises are hard to ignore:
- Edge‑seal stress: the Glass & Glazing Federation guidance Low‑Res Narrow Cavity Insulating Glass Units – Sept 2020 warns that reduced seal depth can cut service life to five years or less.
- Short or conditional guarantees
- Slenderpane warranty offers only 3 years on 6 mm heritage units and 10 years at best.
- SashGlass warranty (Slimlite distributor) advertises just a 5‑year manufacturer’s guarantee.
- Histoglass warranty caps cover at 7 years on its HD‑series slim units.
- Poor claim history: homeowners report failed units, warranty denial or very short cover.
- MoneySavingExpert – Slimlite warranty dissolved explains how manufacturer liquidation left no one to honour a 10‑year guarantee.
- MoneySavingExpert – double glazing units failed includes an industry insider noting that warranties on slim units can be 2–5 years.
- PistonHeads discussion features the comment: “Slim lite units have no warranty and don’t last long before they fail.”
- Green Building Forum – discussion 7759 contains multiple user reports of premature slim‑unit failures.
- Green Building Forum – discussion 2516 records seal failures and voided guarantees.
Overall these units are thicker, less efficient and often unsupported when issues arise.
Why a 25‑year warranty matters
- Lower life‑cycle cost: one installation, not two
- Conservation confidence: planners prefer products with proven longevity
- Transferable value: the warranty follows the window, boosting resale appeal
Ready for panes that last a full 25 years?
LandVac’s 25‑year warranty sets a new benchmark for slim glazing. Contact our team today to specify vacuum glazing that stays crystal‑clear and energy‑smart long after other units have failed.