The pitch for EcoTank printers has always been the same: pay more upfront for the hardware, spend almost nothing on ink. After a few years with the Epson ET-2720, that promise holds up in practice — and the first refill is a good opportunity to see whether the ongoing cost story is actually as good as advertised.

The short version: yes, it is. Here’s what the refill process looks like.

The EcoTank ink economy

Standard inkjet printers use cartridges. The cartridges are small, the margins on cartridge ink are enormous, and the per-page cost is high. EcoTank printers replace cartridges with refillable tanks — large reservoirs that sit visibly on the side of the printer and hold far more ink than any cartridge.

A single bottle of Epson EcoTank black ink costs around $17 and contains roughly the equivalent of 30 to 40 standard ink cartridges. Over the life of a printer that you use regularly but not constantly — the kind of household or small-office printer where cartridges would normally run dry every few months — the difference in annual ink cost is significant.

The ET-2720 ran for three to four years on its original factory-installed ink before the black tank needed a refill. At $17 to refill, that’s a comfortable number compared to repeated cartridge purchases over the same period.

What you’ll need

• The correct Epson EcoTank ink bottle for your printer model (black, cyan, magenta, or yellow as needed). For the ET-2720 and most T-series EcoTank models, the bottles are 502 series inks. The bottle color and label match the tank color on the printer — don’t mix them up.
• That’s it. No tools, no syringe, no mess. The bottles are designed to work with the tank ports directly.

The process

The printer initiates the refill process from the touchscreen — when the ink level drops low enough, it prompts you through the steps on-screen. Follow the printer’s guidance; it knows what it needs.

Match colors. Before opening anything, confirm you have the right color ink for the tank you’re filling. The tanks are color-coded and the bottles are labeled, but it’s worth a visual check.

Open the tank cap. The tanks are on the left side of the printer. Each tank has a small hinged cap over the fill port. Open it.

Position the bottle. The EcoTank bottle has a nozzle designed to mate with the fill port. There are small alignment features on the bottle nozzle and the port — position the bottle so these line up, then stand the bottle upright to insert the nozzle into the port.

Don’t squeeze. The ink flows by gravity and the pressure differential between the sealed bottle and the tank — the printer will remind you not to squeeze the bottle. Squeezing forces ink in faster than the port can handle, which causes overflow. Leave the bottle in place and let physics do the work.

Listen for the gurgle. As the ink flows down from the bottle into the tank, you’ll hear it gurgling. When the gurgling stops, the tank is full — the system equalizes and flow stops automatically. The bottle stops itself at the correct fill level.

Remove the bottle and close the cap. The bottle may have a small amount of ink remaining; that’s normal. Cap it for storage or dispose of the bottle. Close the tank cap on the printer.

Reset the ink level. The printer’s ink level indicator is software-based, not a physical float. After refilling, the printer prompts you to confirm which color you refilled, and resets the displayed level accordingly. Follow the on-screen confirmation.

Do a test print. Run a test page to confirm the ink is flowing and printing correctly. Color balance, nozzle patterns, and density should all look normal after a successful refill.

Common questions

Can I use third-party ink? Yes, and it’s cheaper than Epson’s own bottles. The tradeoff is variable quality — color accuracy, fade resistance, and nozzle behavior can differ from Epson’s formulation. For documents and general use, third-party ink typically works fine. For photos you want to last, Epson’s own ink is the safer choice.

What if the ink doesn’t flow? Make sure the bottle nozzle is seated properly in the port. Also check that the tank cap is fully open — if the cap partially covers the port, flow is restricted. The system is gravity-fed with no pump, so a proper seal at the nozzle is essential.

Do I need to run a cleaning cycle after refilling? Generally no, if the printer has been running recently. If the printer has been sitting unused for months and print quality was poor before the refill, a nozzle cleaning cycle through the printer’s maintenance menu may help — but that’s about the dormant period, not the refill itself.

The real cost comparison

Epson’s own 502 black ink bottle: approximately $17 at Amazon, roughly equivalent to 40 cartridges’ worth. A single Epson 252 black cartridge for a conventional printer in the same price range: around $13-16 each. The math is straightforward. The EcoTank model doesn’t make sense for very low-volume printing (the upfront hardware premium takes a long time to amortize), but for any printer that sees regular use, the per-page cost is among the lowest available outside of laser.

References and further reading

• Epson EcoTank ET-2720 product page — Epson — compatible ink bottle part numbers and printer specs
• Epson 502 ink bottle — Amazon — current pricing for Epson’s own refill ink