What Ink Does the HP OfficeJet 6815 Use?

by William Elward Last Updated: November 6, 2026

Quick answer: The HP OfficeJet 6815 uses HP 934 black and HP 935 cyan, magenta and yellow, or the high-yield 934XL / 935XL. Castle Ink sells remanufactured 934XL/935XL 4-packs and singles: 934XL Black, 935XL Cyan, 935XL Magenta and 935XL Yellow.

CastleScore · November 2026

69/100 — Situational

HP OfficeJet 6815

Pillar (weight)	Score	What it is based on
Owner ratings (28%)	—	No retailer rating with enough reviews to use.
Expert reviews (18%)	—	No published numeric expert score we could verify.
Cost per page (24%)	90	About 1¢ per page in black and color with our remanufactured 934XL (1,000 pages) and 935XL (825 pages).
Reliability (13%)	74	Owners report printhead errors that survive resets on this printer family; the printhead is built in.
Features (12%)	78	Print, copy, scan, fax, document feeder, auto two-sided printing, Wi-Fi, touchscreen.
Value (5%)	—	Not scored without owner ratings

Limited data: We could not find enough owner ratings or published expert scores for this printer, so those weights are spread across the other pillars. With neither owner ratings nor a published expert score, we cap this printer at 69 (Situational) until better data is available.

Older model. This printer is no longer a current model, but its HP 934 and HP 935 cartridges are still widely sold, including our remanufactured versions.

CastleScore is Castle Ink’s own editorial rating, built from retailer star ratings, expert reviews, real cost per page and owner complaint patterns, checked November 6, 2026. It is not a customer review. See every ranked printer or how the score works.

What Ink Does the HP OfficeJet 6815 Take?

Cartridge	HP part no.	Approx. yield	Castle Ink option
934XL Black	C2P23AN	~1,000 pages	Remanufactured, $9.99
935XL Cyan	C2P24AN	~825 pages	Remanufactured, $7.99
935XL Magenta	C2P25AN	~825 pages	Remanufactured, $7.99
935XL Yellow	C2P26AN	~825 pages	Remanufactured, $7.99
934XL + 935XL 4-pack	C2P23AN–C2P26AN	One of each	Remanufactured, $30.99

Yields are HP's figures. Standard 934/935 cartridges fit too but print about 400 pages each. Our cartridges are genuine HP shells, cleaned, refilled and print-tested.

What Does OfficeJet 6815 Ink Cost per Page?

About 1¢ a page in black and about 1¢ per color cartridge with our remanufactured XL cartridges.

Will Non-HP Cartridges Work in the 6815?

Usually, yes. HP's dynamic security can block non-HP chips after a firmware update, so turn off automatic updates before installing aftermarket ink. If a cartridge is ever rejected, we replace or refund it under our 1-year guarantee.

How Do I Replace the Ink in the OfficeJet 6815?

Turn the printer on and open the cartridge access door.
Wait for the carriage to stop moving.
Press the front of the empty cartridge to release it and pull it out.
Unwrap the new cartridge and push it into the matching color slot until it clicks.
Close the door.

Which Other Printers Use HP 934 and 935?

The OfficeJet 6812, OfficeJet Pro 6835, OfficeJet Pro 6830 and OfficeJet Pro 6230.

What OfficeJet 6815 owners ask

These are the questions that come up most for this printer on retailer Q&A pages, support forums and owner reviews, answered in our words.

What's the difference between the 6812 and 6815?

The 6815 adds fax. Both use HP 934/935 ink.

Why won't my new cartridge be recognized?

Reseat it firmly, check the protective tape is fully removed, and make sure automatic firmware updates haven't blocked it.

Frequently Asked Questions