Foundations 06 / Buyer Basics
The real differences between three in one four in one and five in one printers
Three in one. Four in one. Five in one. The labels run across retail boxes, dealer brochures, price-comparison sites and every Spanish electronics landing page. The numbers count functions inside one chassis. The gap between the three labels comes down to two functions and a marketing layer that shifts by brand.
Once the labels are stripped of their marketing, the buying decision rests on two yes-or-no questions. A typical office that works through them lands on a four-in-one.
A five-in-one inkjet at 250 euros and a four-in-one laser at 1,800 euros are different machines for different offices. The higher number sits on the cheaper, slower one.
The three labels, stripped of marketing
Three in one means print, copy and scan. Three functions, no fax. The chassis covers everything an office that has moved off paper-based fax workflows touches in a normal day. Brother, Canon and HP all ship colour laser units in this configuration, often the same hardware as their four-in-one sibling with the fax board left out. The Brother HL-L3280CDW at around 380 euros runs 27 pages a minute in colour as a print-focused unit of this kind.
Four in one means print, copy, scan and fax. The fax module is a separate hardware board with a phone-line socket on the back of the chassis. On many current machines the same physical body ships as either three-in-one or four-in-one. The difference is a firmware flag with a 100-to-400-euro price gap behind it. The HP Color LaserJet Pro MFP 4301fdw at around 750 euros runs 35 pages a minute with the fax module included. The Brother MFC-L8900CDW at around 850 euros runs 33 a minute with a 70-sheet duplex feeder.
Five in one is the loosest of the three labels, the one brands stretch the widest. The fifth function added to the four-function base might be wireless and mobile printing marketed as a feature, an automatic document feeder counted as a function when it is only a component, a cloud connector sold as its own line item, or a USB port for printing straight off a thumb drive. No single industry definition fixes what makes a unit a five-in-one.
Two five-in-one units from two brands often count two different fifth functions.
What three-in-one leaves out
An office choosing three-in-one over four-in-one pays 100 to 400 euros less and gives up sending or receiving faxes from the chassis. In 2026 that trade works for the majority of offices. Email, secure file sharing and electronic-signature platforms have replaced fax in nine workflows out of ten across European SMBs. The fax board sits idle on nearly every machine that carries it.
The cases where fax still flows are narrow and specific. Healthcare offices in regulated regions where prescription transmission and insurance paperwork still ride on fax. Legal offices filing to courts that accept fax as a backup channel. Public-sector desks in regions where municipal forms move over fax for legacy reasons. Insurance back offices exchanging claim documents with carriers running on old fax servers. None of those is the average Spanish SMB.
A fax moving a patient record between two clinics avoids the encryption and access-control duties that attach to email under health-privacy rules. Prescription transmission to pharmacies runs on fax. Courts accept fax filings. None of it shifts until the rules behind it shift, a change measured in years.
A fax crossing the public phone network travels as an analog signal with no encryption on the line. Its standing comes from legal recognition and an established paper trail. An internet fax service can wrap the same transmission in transport encryption on its own legs of the journey.
Where fax does still flow, the modern answer often skips the chassis fax board altogether.
Internet fax services replace the board with a subscription. Sending a fax starts as an email. The user types the recipient’s fax number into an address like 34911234567@faxservice.com, attaches the document as a PDF or a TIFF, then sends it like any other message. The service encodes the file and pushes it over the network. Its gateway dials the recipient’s machine and plays the G3 fax tones down the line, falling to the T.38 protocol wherever the path crosses IP. Receiving runs the other way. The office rents an inbound fax number. Every fax sent to that number lands as a PDF in an email inbox, ready to save or forward. The hardware behind all of this is a plain three-in-one with no fax board fitted. The workflow is still a fax flow end to end. The cost is a few euros a month against the 100-to-400-euro board it stands in for.
Underneath both routes sits the same old protocol. A Group 3 fax machine speaks T.30, the standard that handles the handshake and the page data over an analog phone line. T.30 was built for a continuous low-latency circuit. It does poorly once its signal crosses a packet network. Small delays and dropped packets break the timing it depends on. T.38 is the fix for that. It demodulates the fax signal into data packets, carries them across IP with a copy of each packet built in for redundancy, then re-modulates at the far end so the receiving machine hears a clean T.30 call. An internet fax service leans on T.38 across the parts of the path that run over IP.
The question is whether the office faxes often enough to want the board built into the machine, against routing the rare fax through a cheap online service.
Receiving a fax needs a number that stays reachable.
What five-in-one tries to add
Five in one is where the marketing language drifts furthest from the hardware. Brother tends to use it for print, copy, scan, fax and PC-fax, the last being a fax sent straight from a computer through the machine without printing first. HP sometimes counts wireless printing as the fifth function beside the four base ones. Canon uses it in some markets to fold in mobile printing through its phone app. Epson applies it to inkjet lines to count duplex document feeding as a function. Each of those fifth functions already ships on the four-in-one beside it.
None of those fifth functions is unusual on a current machine. Wireless printing is standard on every office-class unit sold today. Mobile printing through AirPrint and Mopria is standard. A PC-fax driver ships with any machine that carries a fax board. Duplex document feeding is standard from Segment 3 upward. The five-in-one label often dresses up capabilities a buyer would expect on any modern unit.
Ignore the number and check the one named function against the spec sheet. If that function is mobile printing, the four-in-one beside it almost certainly has it as standard. If it is A3 paper handling or photo printing, that is a real difference to confirm.
A higher number reads as more value on a shelf full of similar boxes. Counting a standard capability as a separate function lets a brand print a bigger number without adding hardware.
The five-in-one label turns up mainly on inkjet and home-office lines, the part of the market driven hardest by the number on the shelf. A fifth counted function dresses up a budget machine for buyers comparing boxes fast. Office-class laser units tend to stay with three-in-one or four-in-one labels, where the buyer reads a full spec sheet before signing a multi-year service contract anyway.
The same label covers inkjet and laser
The function count says nothing about the print technology underneath. A three-in-one can be an inkjet or a laser. A four-in-one can be either one. Two machines wearing the same number can run on completely different engines, with different running costs and different strengths.
Inkjet machines wear these labels at the low end of the market. They cost less up front. They handle colour photos and A3 paper well on some lines. A colour page off a cartridge inkjet runs around 15 to 25 cents. The same page off a colour laser runs closer to 12 to 15 cents. A service contract that prices toner by the page pushes the laser figure lower still. A five-in-one inkjet at 250 euros and a four-in-one laser at 900 euros aim at different buyers.
Laser machines fill the office tiers these labels mostly describe. They run faster. They cost more per colour page on a service contract. They hold up to higher monthly volumes. An office weighing a three-in-one against a four-in-one is almost always weighing two lasers from one family. The engine is a constant across that pair.
Where all-in-one fits in
All-in-one is a fourth label that overlaps the others. Retailers use it loosely for any machine that prints, copies and scans, which makes it a synonym for three-in-one across many listings. Some stretch it to cover a four-in-one with fax. The term carries even less precision than the numbered labels. One retailer lists a fax-equipped laser as all-in-one. The next lists a print-copy-scan unit with no fax under the same word. A shopper filtering for all-in-one sees both side by side, with no signal from the term which one faxes.
A box marked all-in-one might fax or might not. It might run on ink or on toner. It might sit in Segment 1 or in Segment 3.
What the labels never tell a buyer
The numbers that decide whether a machine fits an office almost never appear on the three-in-one or four-in-one label. Pages per minute on the print engine sets how long a run ties up the machine. The recommended monthly volume shows how hard the unit can be pushed before it wears early. Paper input capacity across the trays sets how often someone refills it. First-copy-out time from sleep is the wait a person feels at the panel. The cost per page on the service contract decides the largest slice of the five-year bill. Across 60,000 colour pages a year, a single cent of difference in that cost is 600 euros, well past the price of the fax board the whole label argument turns on. None of those five figures tracks with three or four or five. The dealer segment scale, numbered one through six, captures the part the function count misses. It maps straight to speed, paper handling, finishing and durability. A Segment 1 unit and a Segment 4 unit can both wear the four-in-one label and still serve completely different offices.
Why the count still leads the box
A number that decides so little keeps the front of the box for a plain reason. It is the fastest thing to compare. A shopper scanning a shelf of similar machines reads three against four against five in a second, long before reaching a duty cycle or a cost-per-page line. A bigger one reads as more for the money, even when the machine behind it is the slower, cheaper one.
Retail listings lean on the same shortcut. Price-comparison sites file machines under three-in-one or four-in-one as a top-level filter. Search terms follow the labels. A brand that drops the number loses placement on the pages where buyers begin looking.
The two questions that decide the label
Stripped down, the choice between the three labels rests on two questions an office can answer in a minute.
Question one decides three against four. Does the office send or receive faxes more than once a month from a machine? A yes points to four-in-one, or to a three-in-one paired with an online fax service. A no settles it on three-in-one and saves the 100 to 400 euros the fax board would have added. For the typical Spanish SMB in 2026 the honest answer is no.
Question two decides whether five-in-one needs a second look. Does the office need a specific function that a brand parks behind the five-in-one label, mobile printing for staff on the road, a PC-fax driver, duplex document feeding for two-sided originals? If the answer is yes, the move is to check that function against the spec sheet of the four-in-one already under consideration. The function is usually there already, standard on the segment, with no need to pay for the higher label.
In practice the answer for a typical Spanish SMB lands on a four-in-one unit at Segment 2 or Segment 3. Mobile printing and duplex feeding come standard at those segments. The four-in-one label is what the dealer invoice will read.
Specific models behind each label
The table below puts a few 2026 machines against their labels. Prices are illustrative, drawn from typical Spanish retail in 2026. The function count and the speed move independently of each other.
| Label | Functions | Example, 2026 | Colour speed |
|---|---|---|---|
| Three-in-one | print, copy, scan | Brother HL-L3280CDW (~380 €) | 27 ppm |
| Three-in-one | print, copy, scan | Canon i-SENSYS MF754Cdw, fax unlicensed (~580 €) | 33 ppm |
| Four-in-one | + fax | HP Color LaserJet Pro 4301fdw (~750 €) | 35 ppm |
| Four-in-one | + fax | Brother MFC-L8900CDW (~850 €) | 33 ppm |
| Four-in-one | + fax | Lexmark CX730de (~1,200 €) | 42 ppm |
| Five-in-one | + marketing layer | varies by brand and quarter | no pattern |
The speed column does not line up with the label column. A four-in-one runs anywhere from 33 to 42 pages a minute in this short list alone. The Canon appears as a three-in-one or a four-in-one depending only on whether the fax option is licensed, on identical hardware. The five-in-one row has no speed at all.
The five-in-one examples vary widely. One inkjet wears the label to count its mobile app. Another wears it to count A3 paper handling. A third wears it to count photo printing.
The Lexmark at 1,200 euros buys 42 pages a minute with single-pass duplex scanning. The Brother three-in-one at 380 euros buys 27 pages a minute, fine for a small team. Each could wear a four-in-one badge once a fax board is added. The fax board is the cheapest difference on the whole table.
How to read the box in a shop
Find the pages-per-minute figure first, usually in small print on the side panel. Find the recommended monthly volume next, which tells how much machine is on offer. Note whether the feeder does two-sided originals in one pass or two. Check the connectors for the cloud services the office uses. Only then glance at the three-or-four-or-five on the front.
Each of those figures hides in a different corner of the box. Pages per minute sits in the headline specs, the one number marketing does print. The monthly duty cycle hides in the fine print on the back or in the online datasheet, listed as recommended monthly volume or maximum duty cycle. First-copy-out time shows up only on the datasheet, measured in seconds from sleep. Cost per page rarely appears on the box at all. It comes from the dealer quote, in the price per thousand pages on the service contract.
The function count is the last thing to read, well behind the speed and the volume.
The one line to remember
Three-in-one means print, copy and scan. Four-in-one adds fax. Five-in-one means whatever the brand decides it means that quarter. The function the office needs, the speed segment and the cost per page on the service contract settle the purchase.
Common questions
Is a four-in-one better than a three-in-one?
Only if the office faxes from the machine. The two are usually the same hardware, with the four-in-one’s fax board adding 100 to 400 euros. An office that does not fax buys the same machine for less by choosing three-in-one.
What is the fifth function in a five-in-one?
It depends on the brand. It might be PC-fax, wireless printing, mobile printing or duplex document feeding. There is no industry standard, so the spec sheet is the only reliable guide to what the label covers on a given box.
Does a higher number mean a faster machine?
No. The number counts functions. It says nothing about speed. A five-in-one inkjet can be slower than a three-in-one laser. Pages per minute sits in the small print, well off the label on the front.
Do I still need fax in 2026?
Few offices do. Healthcare, legal and some public-sector workflows still rely on it in places. Where the rare fax is needed, an online fax service handles it for a few euros a month without a fax board in the machine.
What should I read before the function count?
Pages per minute, the recommended monthly volume, the paper capacity, the first-copy-out time and the cost per page on the service contract. Those five decide whether a machine fits.
The labels three-in-one, four-in-one and five-in-one count functions. The decision turns on speed, volume and cost per page, the figures the box front never shows.