# 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.

- Author: Alex Riesenkampff (Super44)
- Published: 2026-10-29
- Canonical: https://super44.ai/blog/kds-reality-check

## Key takeaways

- Of the three vendors whose help pages describe it, only Toast documents a kitchen display that keeps receiving tickets through an internet outage, and only with a hardwired device on the network acting as hub; Square's community programme manager called offline KDS in development in September 2025.
- A 30 cm bearing wall adds 20 to 25 dB of loss to a 2.4 GHz WiFi signal on Keenetic's table, so two of them between router and screen cost 40 to 50 dB; Lightspeed tells owners to wire the screen because "Kitchen equipment will interfere with your Wi-Fi signal."
- A wired connection is cheap beside the screen: UK installers quote £60 to £150 per Cat6 point (trade2base, June 2026), against £549 + VAT for a 21.5 inch Square screen and £15 + VAT a month in software.
- Two Square screens and two cable points at £120 each over 36 months come to £2,418 before VAT, and none of the three documents a screen surviving a failure of the kitchen's own network, so keep a printer and a pad of paper dockets on the pass.

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.

**What each vendor's own help pages say about a kitchen display when the connection fails**

| Vendor | Internet drops | Local network drops | Wiring advice | UK price shown |
| --- | --- | --- | --- | --- |
| Toast | Screen keeps receiving in-store tickets, if a hardwired Toast device on the network is the hub | Not supported: devices lose the local network they use to talk to each other (Toast platform guide) | Hub must be hardwired; multicast (UPnP) enabled on the router | None found |
| Square | Offline KDS described as in development (staff, September 2025); no offline statement on the KDS page | Not published | Not published | £549 + VAT screen, £15 + VAT a month per device |
| Lightspeed K-Series | Not published | Hub must not lose its connection with the screens; a stalled screen stops syncing | Use a wired connection rather than WiFi; static IP for the hub; hub always on | None in sterling |

*Sources: Toast support (updated 29 September 2026) and platform guide, Square Community and Square UK pages, Lightspeed K-Series support. Toast's help pages are written for its general market, so confirm the UK setup with Toast.*

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:

> We're working on a new offline mode for KDS so POS orders reach your KDS, even during an internet or Square outage.
>
> — [forum handle ishaan, labelled Square Employee Alumni, Square Community, 8 February 2024](https://community.squareup.com/t5/Feedback-Discussions/KDS-Offline-Mode/m-p/709200)

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.

> To avoid connection interruptions, use a wired connection rather than relying on WiFi.
>
> — [Lightspeed K-Series support, Setting up the Kitchen Display System 2.0](https://k-series-support.lightspeedhq.com/hc/en-us/articles/22168531609499-Setting-up-the-Kitchen-Display-System-2-0)

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.

> **40 to 50 dB** — Added loss from two 30 cm bearing walls at 2.4 GHz, on Keenetic's approximate table (Keenetic support)

**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.

**Published UK prices for the parts of a wired kitchen screen**

| Item | Published price | Source |
| --- | --- | --- |
| Cat6 data point, supplied and installed | £60 to £150 | trade2base, 14 June 2026 |
| Cat6 data point, installed all in | £75 to £120 | Network Data Cabling, updated 23 October 2026 |
| Difficult run (long route, height, listed building) | £150 to £300 or more per point | trade2base, 14 June 2026 |
| Square 21.5 inch kitchen display screen | £549 + VAT | Square UK pricing page |
| Square KDS software | £15 + VAT a month per device | Square UK pricing page |
| 4G or 5G backup connection (bundled managed service) | £80 to £250 a month | Cloudswitched's own estimate |

*Prices as published; the cabling pages do not say whether VAT is included. The 4G figure is one managed-IT provider's estimate, not an independent price.*

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.

**Three-year cost of a wired kitchen screen setup, before VAT** *(interactive calculator in the web version)*

Example (Screens: 2, Price per screen, ex VAT: 549 £, Software per screen per month, ex VAT: 15 £, Months: 36 months, Cable points to install: 2, Price per cable point: 120 £, Backup kitchen printer, your quote: 0 £):

- Total over the period: 2,418 £
- Average per month: 67 £

*Defaults: Square UK list prices (£549 + VAT screen, £15 + VAT a month; Restaurants Plus at £69 a month per location includes unlimited devices instead) and £120 per Cat6 point from the top of Network Data Cabling's £75 to £120 range. Add VAT if you cannot reclaim it. Excludes the till, router and card processing.*

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## 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.

**Printer, screen, or both?** *(interactive decision helper in the web version)*

**Possible routes:**
- **How many cooks work the pass at your busiest service? — One or two:** Keep a wired kitchen printer. With one or two cooks, or with no cable to the pass, a printer on the same wired network as the till is the more reliable chain. Revisit when you add a station. Next move: Put the printer on a cable, not WiFi, and write the allergy line in bold on the ticket template.
- **How many cooks work the pass at your busiest service? — Three or more, or several stations that finish one order together → Can you run Ethernet to where the screen will hang? — Yes, or an installer has quoted it:** Wired screen, with the printer kept as a fallback. Run the cable first and keep the printer plugged in on the pass. Only a documented offline mode, such as Toast describes, justifies retiring the printer, and then only after you have unplugged the broadband cable from the router in a quiet hour and watched what the screen does. Next move: Rehearse the switch to paper once a month, and move to a screen-only pass only when your vendor documents the behaviour you tested.
- **How many cooks work the pass at your busiest service? — Three or more, or several stations that finish one order together → Can you run Ethernet to where the screen will hang? — No, it would have to run on WiFi:** Keep a wired kitchen printer. With one or two cooks, or with no cable to the pass, a printer on the same wired network as the till is the more reliable chain. Revisit when you add a station. Next move: Put the printer on a cable, not WiFi, and write the allergy line in bold on the ticket template.

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.

**When the kitchen screen stops showing tickets**

1. **Call it once, out loud:** The person on the pass says the screen is down and who owns the paper tickets from now on.
2. **Reprint what is open:** Pull the open tickets from the till and print them on the kitchen printer; if the router is down, write dockets by hand from the till.
3. **Tell front of house:** Servers hold new orders for a moment and read allergies aloud, since the flag may not have reached the pass.
4. **Leave the router alone until close:** Toast lists turning off or restarting the router among the things to avoid in offline mode, so wait until after service.
5. **Write down the time and the cause:** Note what failed: the internet, the WiFi, the hub or the screen. After four entries you know what to fix.

*Keep the printer paper loaded and a pad of dockets by the pass. A printer that is out of rolls is not a fallback.*

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](/blog/best-pos-systems-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](/blog/square-fees), and [why a cafe can be busy and still lose money](/blog/coffee-shop-busy-but-not-profitable) shows where a hardware bill like this sits against takings.

## FAQ

### Does a kitchen display system work without internet?

It depends on the vendor. Toast documents that its KDS keeps receiving tickets for new in-store orders during an internet or Toast outage, provided a hardwired Toast device on the same network acts as the local hub. A Square Community post from February 2024 by a Square-labelled alumnus said an offline mode was being built, and Square's community programme manager called it in development in September 2025. Lightspeed says the hub must not lose its data connection with the screens.

### Is a kitchen printer better than a KDS for a small kitchen?

For one or two cooks working one pass, yes, and it is the default recommended here. A printer on the same wired network as the till has no screen, mount or software fee, and it keeps working when a tablet freezes. A screen starts to earn its place when several stations need to see the same order, or when tickets are lost between a printer and a cook.

### Can I run a KDS over WiFi in an old building?

You can, but it is the first thing to fail. Cisco puts a brick wall at 10 dB of loss and Keenetic puts a 30 cm bearing wall at 20 to 25 dB on 2.4 GHz, and Lightspeed states that kitchen equipment interferes with WiFi. Run Ethernet to the screen, which UK installers price at £60 to £150 a point, rising to £150 to £300 or more for difficult runs, including listed buildings.

### What does a kitchen display screen cost in the UK?

Square lists its 21.5 inch kitchen display screen at £549 + VAT and the software at £15 + VAT a month per device, or included with Restaurants Plus at £69 a month per location. With any other vendor, ask for the monthly figure per screen in writing.

### What should I do when the kitchen screen goes blank mid-service?

Keep the printer as the fallback and rehearse the switch. Pull the open tickets from the till, reprint them on the kitchen printer, and run the pass from paper until service ends; if the router is down, write the dockets by hand. Leave the router alone until service ends, since Toast lists turning off or restarting the router among the things to avoid in offline mode.

## Sources

1. [Toast platform guide: Offline mode and KDS devices](https://doc.toasttab.com/doc/platformguide/platformOfflineKDSDevices.html) — Undated. With an internet or Toast cloud outage and an eligible local hub, orders on the same local network still reach KDS devices; a local network disruption leaves Toast devices without a network to communicate over, and printers are affected too. Checked 29 October 2026.
2. [Lightspeed UK: Restaurant hardware](https://www.lightspeedhq.com/uk/pos/restaurant/hardware/) — Undated, footer 2026. ELO kitchen display described as built to withstand steam, heat and water; Epson TM-U220B LAN kitchen printer described as specifically designed for fast-paced and humid kitchen environments. No price shown. Checked 29 October 2026.
3. [Toast support: Using Toast in Offline Mode](https://support.toasttab.com/en/article/Using-Toast-in-Offline-Mode) — Page last updated 29 September 2026. KDS keeps receiving tickets for new in-store orders during an internet or Toast service disruption; needs UPnP multicast on the router and at least one hardwired non-Elo V1 Toast device as local hub; multiple subnets reduce the chance it works; online orders do not reach the KDS until the auto-fire device is back online. Toast's general support site, not UK-specific. Checked 29 October 2026.
4. [Square Community: KDS Offline Mode](https://community.squareup.com/t5/Feedback-Discussions/KDS-Offline-Mode/m-p/709200) — Original post by handle ishaan (labelled Square Employee Alumni), 8 February 2024; Square Community Program Manager (handle nika) on 26 September 2025 said the feature was in development with 2026 as the target, timing uncertain. Later posts are from users asking about progress (latest seen 13 April 2026), with no Square reply visible. A community forum, not Square documentation. Checked 29 October 2026.
5. [Square UK: Kitchen display system](https://squareup.com/gb/en/point-of-sale/restaurants/kitchen-display-system) — £15 per month per device, free for 30 days; Restaurants Plus £69 per month per location for unlimited devices. The page does not mention offline use or WiFi. Checked 29 October 2026.
6. [Square UK: Restaurants pricing](https://squareup.com/gb/en/point-of-sale/restaurants/pricing) — Kitchen display screen 21.5 inch at £549 + VAT; £15 + VAT per month per KDS device. Checked 29 October 2026.
7. [Square UK help: Square KDS guide](https://squareup.com/help/gb/en/article/7397-square-kds-guide) — The page gives 12 January 2026 as the date the Square KDS app on iOS is fully disabled; the Android app has the same features. Checked 29 October 2026.
8. [Lightspeed K-Series support: Setting up the Kitchen Display System 2.0](https://k-series-support.lightspeedhq.com/hc/en-us/articles/22168531609499-Setting-up-the-Kitchen-Display-System-2-0) — Hub must not lose its data connection with the screens; use a wired connection rather than WiFi; hub and screens on the same network; static IP; hub must stay on. Undated, footer 2026. Checked 29 October 2026.
9. [Lightspeed K-Series support: Setting up the ELO I-Series 4 touchscreen](https://k-series-support.lightspeedhq.com/hc/en-us/articles/23587944430747-Setting-up-the-ELO-I-Series-4-Touchscreen) — Strongly recommends a LAN cable to the Ethernet port; states that kitchen equipment will interfere with the WiFi signal. Checked 29 October 2026.
10. [Cisco: Wireless RF Reference Guide](https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/technical-reference/wireless-rf-reference-guide.html) — Brick walls 10 dB, concrete 12 dB, drywall typically 3 dB; no thickness stated. Checked 29 October 2026.
11. [Keenetic support: Wi-Fi signal attenuation by obstacle](https://support.keenetic.com/titan/kn-1811/en/20207.html) — Undated, footer 2026. Values are approximate and given for the 2.4 GHz band: interior wall (15.2 cm) 15 to 20 dB, bearing wall (30.5 cm) 20 to 25 dB. Checked 29 October 2026.
12. [CWNP: Interference from non-WiFi sources, part 1](https://cwnp.com/the-wise-article-series-interference-from-non-wifi-sources-part-1) — Bhaskaran Raman, first posted 7 May 2013. Inverter-type microwave ovens can significantly affect WiFi performance across the 2.4 GHz band. Older article, physics unchanged. Checked 29 October 2026.
13. [trade2base: Network cabling costs UK](https://www.trade2base.com/blog/network-cabling-costs-uk) — Dated 14 June 2026. Cat6 data point supplied and installed £60 to £150; difficult runs including listed buildings £150 to £300 or more per point. VAT treatment not stated. Checked 29 October 2026.
14. [Network Data Cabling: Structured cabling cost UK](https://network-data-cabling.co.uk/blog/structured-cabling-cost-uk/) — Published 27 May 2026, updated 23 October 2026. Professionally installed Cat6 data point typically £75 to £120 all in. Installer marketing page. Checked 29 October 2026.
15. [Cloudswitched: 4G and 5G business broadband backup and failover](https://www.cloudswitched.com/blog/4g-5g-business-broadband-backup-failover) — Dated 12 April 2026. A managed-IT provider's own estimate: bundled backup service typically £80 to £250 a month. Vendor figure, not an independent price. Checked 29 October 2026.
16. [Partner Tech: KDS-A5 kitchen display](https://www.partnertechcorp.com/ca/products-detail/KDS-A5/) — Undated product page. Entire unit IP54, front panel IP65; operating temperature 0 to 40°C. One product, quoted as an example of a rating. Checked 29 October 2026.
17. [Food Standards Agency / Basis Social: SME allergen provision in the non-prepacked sector](https://science.food.gov.uk/article/156227-sme-allergen-provision-in-the-non-prepacked-sector/attachment/328081.pdf) — March 2023, fieldwork January and February 2023, 30 SME interviews. Businesses with more staff in specialised roles were more likely to use written documentation and encourage kitchen and front-of-house communication; verbally passing customer allergy risks to kitchen staff is listed among the methods. Qualitative study: 30 SME interviews, 10 ethnographic visits, 6 trade bodies. Checked 29 October 2026.