Canon Fax B840 Ink Cartridges

The following 1 products are guaranteed to work in your Canon Fax B840 printer:

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Black ink cartridges for Canon Fax B840 printer

Compatible Black Canon BX-3 Ink Cartridge - (Canon BX-3)
  • Black ink cartridge
  • Premium brand recycled ink cartridge

    Made using recycled Canon cartridges, this cartridge is a direct replacement for the Canon version. Manufactured to strict quality standards, our premium cartridges produce high quality prints and are very reliable — in fact, we use them in our offices and recommend them to friends, family and other businesses.

  • 12 month guarantee and FREE returns

    If within a year of purchase you happen to experience any quality problem, we'll happily provide a replacement, or a full refund.

    Whatever the reason for returning items to, you will never pay a penny for postage.

  • Won't invalidate your printer warranty

    We guarantee that your standard printer warranty will not be invalidated by using our premium brand cartridges. If any of our cartridges do cause a problem with your printer, we'll arrange for your printer to be repaired (or replaced if it can't be repaired).

3.2p per page

For most cartridges this is based on 5% coverage on A4 paper. These numbers are based on manufacturer quoted values and are for comparison purposes only.

480 pages
1 £15.34 (£18.41 inc VAT)
2 £13.56 (£16.27 inc VAT)
3+ £12.79 (£15.35 inc VAT)
Prices includes FREE next-day delivery
3.2p per page

For most cartridges this is based on 5% coverage on A4 paper. These numbers are based on manufacturer quoted values and are for comparison purposes only.

480 pages
£15.34 (£18.41 inc VAT)

FREE next-day delivery

Multi-buy discount
2 £13.56 (£16.27 inc VAT)
3+ £12.79 (£15.35 inc VAT)

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Canon Fax B840 Printer Review

Expert review of the Canon Fax B840 printer

Our Verdict:

The Canon Fax B840 printer integrates high quality fax, an answering machine, and a telephone in one stylish and affordable device with ample memory capacity. Also aimed at home users, the Canon Fax-B840 bubble jet fax machine boasts a stylish façade and an easy-to-use control panel, but it could have been better with a faster fax modem, higher print resolution, and more fax features.


The Canon Fax B840 fax features a stylish frame with a sheetfed scanner and bubble jet printing technology. It is a standard fax machine with a handset and telephone answering machine, so users can enjoy full telephony features. The Fax-B840 has a 16-character, one-line display screen, an easy-to-use control panel, and a 15-sheet automatic document feeder. The Canon B840 fax machine weighs 3.5Kg and measures 366mm x 265mm x 281mm with the handset and extended trays.


Users can fax worry-free even when paper or ink runs out because of the 120-page fax memory. To lower running costs, ink saver mode can be activated in the Canon Fax-B840 inkjet fax. UHQ (ultra high quality) imaging technology and UcanTalk voice recognition dialling are also among the outstanding features of the Canon Fax-B840 inkjet printer. Saving money on the consumables is possible by installing a cheap compatible Canon B840 fax cartridge made from recycled materials.


The features of the fax machine are limited to auto redialling, verification reports, and activity reports. The Canon B840 fax printer can only record up to 10 minutes worth of voice messages in the answering machine. A larger display screen could serve the Fax B-840 printer better. Transmission speeds are sub-par to newer and faster fax machines because of the 14.4Kbps modem.