Keurig hack runs a water supply line to your coffee maker


We were skeptical about Keurig machines when we first heard about them. Although we still scoff at the added waste of throwing away a plastic container of used grounds for each cup of coffee made, we tried one at the in-laws and it does brew a great cup of Joe. One of the draws of the machine is that it does it pretty much automatically as long as you fill it with water first. [Joseph Collins] is even taking the work out of that by adding a water supply line to his Keurig.

His coffee maker sits right next to the fridge, which has its own water supply. So one day he thought, why not run a line to the coffee maker as well? As far as plumbing projects go it’s very simple. He pulled out the refrigerator and added a T-fitting to split the water supply line. From there he ran an extension next to the coffee maker that terminates with a valve being pointed to by the arrow in the lower left. The plastic supply line leaving the valve passes through a rubber grommet in the lid of the water reservoir pointed to by the other arrow.

[Joseph] figures the whole project came in at under $30 and shows how he did it in the clip after the break.


  1. Neat! Now he just needs a food-grade solenoid valve and a capacitive sensor to make it automatically refill :D

  2. Bob D says:

    Oh man, I know of four houses and 5 floors of an apartment that have been heavily damaged by trouble with water lines like these. (Leaks, failed valves, always seemingly during vacation.) Anything that’s plugged to the city water supply should have some failsafe redundancy in it. I’d probably split it off the kitchen sink’s spray hose so that had that extra valve there. (The downside is it would only fill when the kitchen sink faucet was open.)

    (I admit I only skimmed the video. It’s super long, but at least plumbed it properly instead of using a saddle valve. I’m probably needlessly paranoid.)

  3. Pete says:
  4. mainfr4me says:

    Or keep the unit close enough to sink you can reach the sprayer hose in and refill from there…

    I do like this a lot though. When ours does kick the bucket, we’ll be getting an electric kettle to replace it (we use it mostly just for quick hot water source for tea, oatmeal, etc).

  5. I want to do something similar, but I want to T it off after the filter, might as well get filtered water in that beast.

  6. syntetyczny says:

    simple flasher just like in toilet should do all work with automatic refilling.

  7. Josh says:

    I did the same, but tapped into the filtered water on my refrigerator. I bought a refrigerator door water solenoid and hose and simply put a 120v switch inside an enclosure to power it. I was going to try to tap into the sensor inside, but the case proved too much work to mess with. I’ve been happy just flipping the switch to fill every few brews.

    Not sure if this will share but:

  8. Veneficus says:

    How is this any different than installing a water filter system with a simple T connector? Or running a hose from a different faucet? Or running a water line to a refrigerator? This hack is quite trivial, I don’t even understand why it requires 15 minute of instructions. Clearly I am missing something, or expecting an average Hackaday user to know basic plumbing.

  9. mrxavia says:

    Keuirg and similar only produce passable coffee IMHO, if you really want good coffe it has to be bean to cup… and of course bean to cup, much less waste (I HATE waste) all your doing is throwing out coffee grounds and the bag the beans came in..

    I have been thinking of doing this kind of mod to my bean-to-cup machine, I drink so much I empty the water reservoir very quickly!

  10. First of all Im sorry if my english isnt that good, Im no native speaker. Now my thoughts and concerns:

    Instead of placing a supply line through my whole ktichen Id rather take that tank, pour out the remaining water in the sink, clean it and fill it up manually. That takes only about half a minute, there is no danger of a little flooding in your kitchen (guess what your insurance says if you tell them you had a leakage in the supply line you built yourself) and the best part: you have fresh water. The way he does, a small part of the water inside his tank gets old and there are germs spreading inside the tank.

    As far as I know, the water tank is the most unhygienic part of those coffee machines.

    He certainly did a nice job, but I think under those circumstances he should think about removing the water supply and go back to the old school manually way ;-)

  11. Jason Dubrow says:

    “Although we still scoff at the added waste of throwing away a plastic container of used grounds for each cup of coffee made, ”

    They do make user refillable containers….

  12. Wolfy says:

    One thing about those little plastic cups that makes the whole idea a no-go for me… plastic+heat+water=BPA+water.

    A shame, too, because there are some very good Keurig coffees… But I drink tea now.

  13. kevin says:

    Bad coffee with less effort! America!

  14. Rick says:

    you know there’s a “hack” to allow you to not rely on disposable cups right? Uses whatever canned or freshly ground beans you want. No more waste than a standard pot. Not as tasty as a good french press/hot water type setup but less hassle when youre in a hurry.

  15. erik.the.awful says:

    5 dollar float valve and a drill bit. nuff’ said

  16. curmudgeon_j says:

    I’m surprised………..
    no one else saw the real hack in this post….
    his left hand!

  17. WillyP says:

    It is terrible that the old K-cups made so much waste. I am glad I waited for the Vue to come-out and I make sure to recycle each cup I use.

  18. Daniel says:

    Even better, replace the water pump in the machine with a metered ice machine water valve and bingo, no tank of standing water going rancid. There are complete diagrams available online detailing how these machines work. Bonus points for routing the overflow hose over to the sink.

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