Guides

Kitchen Display Systems for a Small Kitchen: What Happens When the WiFi Drops (UK, 2026)

A small UK kitchen should wire its screen and keep a ticket printer until its vendor documents offline behaviour. What Toast, Square and Lightspeed say happens when the internet or the WiFi fails, what thick walls do to a signal, and what a wired screen costs.

Alex Riesenkampff

29 October 2026 · 13 min read · Markdown

A small kitchen should wire its display screen to the router with an Ethernet cable, a job UK installers price at £60 to £150 a point, and keep a ticket printer on the pass until its vendor says in writing what the screen does when the network fails. Of the three vendors whose help pages describe it, only Toast documents a kitchen display that keeps receiving tickets through an internet outage, and it asks for a wired hub to do it. Square said in 2025 that an offline mode was still in development. Lightspeed tells owners to wire the screen and says nothing about the internet dropping.

That matters most in the buildings first-time owners can afford: a Victorian terrace, a basement kitchen, a shop unit with a steel shutter. The sales pages show a bright screen on a clean wall. They do not show a router in the front of house, two brick walls and a steel pass between it and the fryer.

This guide covers what each vendor says happens when the connection fails, what old walls do to a signal, what a wired screen costs, and when to leave the screen out entirely.

What a screen needs that a printer does not

A kitchen printer needs power and one cable to the same network as the till, while a screen also needs software, a hub or a cloud connection, and a device that does not freeze. Both depend on the till sending the order. The difference is how many things sit between the till and the cook.

A wired LAN printer has a short chain: till, switch or router, cable, printer. It shares one weakness with the screen, since a dead router stops both, and Toast's platform guide says a local network disruption affects kitchen printers too. Lightspeed sells kitchen printers described as designed for fast-paced and humid kitchens alongside its screens, so paper is a normal companion to the display. A screen adds an operating system, an app, a login, sometimes a till acting as the hub that must stay powered, and in some designs a round trip through the vendor's servers.

Square's KDS is Android only since 12 January 2026, when it disabled the iOS app, so an iPad that once ran it can no longer be the screen. The Android app has the same features, according to Square's help centre. That is a hardware bill for anyone who planned to reuse a spare tablet.

What Toast, Square and Lightspeed say happens when it drops

Only Toast documents a screen that carries on during an internet outage, and none of the three says a screen survives a failure of the kitchen's own network. The differences are in the table.

Toast's page is the most useful to read. It says that with Offline Mode its screen can keep receiving tickets for new in-store orders during an internet or Toast service disruption, and that this "replaces the need for backup printers". The conditions are specific: UPnP multicast on the router, one hardwired Toast device acting as hub, and, to give it the best chance, every Toast device on one subnet. Online orders are not included, and the screen gets no ticket for them until the auto-fire device is back online. On non-Toast hardware, Toast says it cannot guarantee that it works or provide troubleshooting support.

Square's position is a promise rather than a feature. A Square Community post by the handle ishaan, labelled Square Employee Alumni, said on 8 February 2024:

In September 2025 Square's community programme manager replied on the same thread that the feature was in development, with 2026 as the target and no firm month. Square's UK KDS page does not mention offline use. If you are on Square, plan as though the screen needs the internet.

Lightspeed's setup page is blunt about the local network. The hub has to stay connected to the screens, stay powered, and sit on the same network with a fixed address. If a screen drops, its sync count stalls until the connection returns. The page does not say whether tickets arrive during an internet outage, so assume they may not.

If you use a different till, ask its vendor two questions in writing before buying a screen. What does the screen do when the internet is down? What does it do when only the router or the WiFi is down? Where the answer is silence, treat the screen as needing both.

Why old walls break a kitchen WiFi design

Vendors put the loss through one solid wall anywhere from about 10 dB to 25 dB, depending on material and thickness, so nobody can calculate your signal from a table. Cisco's RF guide gives brick walls as 10 dB, concrete as 12 dB and drywall as about 3 dB. Keenetic's table, which it says is approximate and for the 2.4 GHz band, puts a 15.2 cm interior wall at 15 to 20 dB and a 30.5 cm bearing wall at 20 to 25 dB.

Two bearing walls between a router in the dining room and a screen at the pass cost 40 to 50 dB before the stainless steel, the extraction hood or the microwave are counted. Lightspeed's own screen setup page says kitchen equipment will interfere with the WiFi signal, and a CWNP article by Bhaskaran Raman, PhD, notes that inverter-type microwave ovens can significantly affect WiFi performance across the whole 2.4 GHz band.

Published figures for steam, grease or a steel-lined kitchen are scarce, so do not trust a calculation. Test the real position. Put a phone on the shelf where the screen will hang, run a continuous speed test or ping through a busy Friday service, and note when it stalls. A signal that holds at 3 pm with the extraction off may not hold at 8 pm with every ring lit.

The old building also decides how you fix it. A mesh system or a second access point helps in the dining room but may not reach the kitchen. A cable does not care what the walls are made of.

What a wired screen costs

A Cat6 cable point costs £60 to £150 installed, a fraction of the £549 + VAT Square charges for a 21.5 inch screen. UK installers publish a range, and the top of it applies to the buildings this article is about.

A 4G or 5G backup connection fixes an internet outage and does nothing for a router that has locked up or a screen the signal cannot reach. On Toast, in-store tickets already continue without the internet, which narrows what a backup line adds. For a single cafe it is a large monthly bill, so put the cable in first.

Try your own numbers. The defaults use Square's list prices and the upper end of the installer range. Add a printer quote if you have one.

When a screen earns its place and when the printer wins

The default is a wired printer for one or two cooks on one pass, and a wired screen once three or more stations need to see the same order. A printer has no screen to buy, mount or wipe down. With two people on the line, the cook calls the order across the pass anyway, so a screen mostly adds a second place to look.

A screen starts to pay when the kitchen has a grill, a fryer and a cold section that cook different parts of one table's order and have to finish together, or when paper tickets go missing between the printer and the pass. It also helps where an order changes after it fires, because the screen shows the change in place and a printer prints a second slip.

Allergies are the part not to hand to a screen alone. Research commissioned by the Food Standards Agency from Basis Social in 2023 found that businesses with more staff in specialised roles were more likely to use written documentation and to encourage communication between kitchen and front of house, and it lists passing customer allergy risks to kitchen staff by word of mouth among the methods in use. A screen can carry a clear allergy flag. It does not replace the cook who hears the order and checks it, so put the flag in the ticket text and keep saying it out loud.

Treat the heat as a hardware question. One kitchen screen, Partner Tech's KDS-A5, is rated IP54 overall, IP65 on the front panel, with a 0 to 40°C operating range. Lightspeed describes its ELO screen as built to withstand steam, heat and water. A consumer tablet on a shelf above the fryer carries no such rating, and a cooked or flooded tablet is the cheapest way to learn it.

What would change this advice is evidence from your own kitchen. If the screen holds when you unplug the broadband cable from the router, leaving the router powered on, and your vendor documents that behaviour as Toast does, retire the printer. If the screen stalls once in a month of service, keep the paper.

What to do the night the screen goes blank

Treat a blank screen as a drill your team has run before, with one person who calls it and one who reprints. Put the steps on the wall by the pass.

Buy the cable before you buy the screen, ask the vendor in writing what happens when the internet goes, and keep the printer until you have seen the answer yourself. If you have not chosen a till yet, the EPOS comparison for a first cafe sets out what each system costs and what it costs to leave. Square owners can check what the card side costs in Square's fees for a UK venue, and why a cafe can be busy and still lose money shows where a hardware bill like this sits against takings.