Keurig B40/B60/B70 automatic water filling system

Picture of Keurig B40/B60/B70 automatic water filling system

This is a simple project I did to avoid adding water into my machine each time I take a cup of coffee. It's a pretty simple system but it also requires basic plumbing knowledge and electrical / soldering skills :-). This DIY will work with B40/B60/B70 model or maybe other if you have enough place for the small bracket and water level sensor that we'll see in a moment. Note: some suggested in the comments a mini plastic float valve if its size fits your reservoir it might be a simpler setup (I did not test it).

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Step 1: Ice maker maker tap valve kit

Picture of Ice maker maker tap valve kit
First, get an ice maker self tap valve kit available in most hardware store for 8$-10$

Tap Valve Kit

For 3/8" to 1" O.D. tube
Valve with 1/4" O.D. comp. outlet
25'x 1/4" O.D. polyethylene tube
Compression inserts
1/4" O.D. comp. union
For installation of humidifiers, ice makers, and evaporative coolers

Step 2: Electrical parts - Electric Solenoid Valve Water N/C 12V 1/4"

Picture of Electrical parts - Electric Solenoid Valve Water N/C 12V 1/4
Next you'll need an Electric Solenoid Valve Water N/C 12V 1/4". It should be water type and "normally closed" to work with the system. I've got mine from Ebay for $12.50

Step 3: Electrical parts - 12 volt relay

Picture of Electrical parts - 12 volt relay
Next you'll need a SPST 12 volt relay. 6$ online

Or you can use one you have lying around.

Step 4: Electrical parts - 12 1Amp + power supply

Picture of Electrical parts - 12 1Amp + power supply
Next you'll need a 1 amp + 12 volt DC power supply. 6$ online

Or you can use one you have lying around. If it's 12 volt dc and 1 amp or more

Step 5: Electrical parts - Water Level Liquid Sensor Float Switch

Picture of Electrical parts - Water Level Liquid Sensor Float Switch
Next you'll need a Water Level Liquid Sensor Float Switch. 2$ online

Step 6: Plumbing / water line installation

Picture of Plumbing / water line installation
You will need to follow the included instructions to install the water valve. The idea here is to get the 1/4 water tube to the Electric Solenoid Valve then to the brewer water reservoir so you can control water flow through the solenoid.

Step 7: Electrical parts - Installation

Picture of Electrical parts - Installation
*WIRING for reference only. Relay pin 85 & 86 are the coil, and 87 & 30 are the switched contactor.

You'll need to wire the solenoid, the relay, the water level switch and the power supply so that the water level switch control the relay that activate the solenoid.
cstout11 month ago

Do you have any reason to worry about lead being present with the use of a brass water solenoid valve?

GlenA made it!7 months ago

Hey, thanks man. I just built this for my Jura-Capresso ENA 4. I pretty much used the parts you linked on Ebay. However, I was getting a fill-stop-fill-stop-fill-stop action during the brew cycle. To fix it, I swapped out the relay for an Altronix 6062 timer circuit, which puts a 20 second delay on the fill action. Perfect!

cstout1 GlenA1 month ago

Do you have any reason to worry about lead being present with the use of a brass water solenoid valve?

pv2smurf2 months ago

A good float valve walk through is here. Requires no extra electrical hook ups just water line plumbing. This method would work on ANY MODEL as long as the bulb isn't too big for the tank.

*the above is not my video so all questions please send him a message on youtube

SyCoQc (author)  pv2smurf2 months ago

thanks for the link pv2smurf

MrLE1 year ago

I've been planning on doing this so I thought I would look around and see what anyone else had done. I currently take the tank off the Keurig and fill it from the refrigerator door since that is filtered water. My wife can't handle the large tank so I try to keep it filled. She usually refills it with a large mug if I haven't done my job.

I had planned on finding a valve and float system similar to a toilet tank refill system. So far I haven't found one small enough to fit in the Keurig tank. I still prefer that although they are probably more prone to over filling and over flowing.

I may cave in and use the electric valve and float switch. Instead of the relay I would prefer to go to with an electronic switch. I'm an electrical engineer so that is right down my alley.

Like someone else mentioned it's also a good idea to implement a filter like the ones we use for refrigerator ice and water. It slows down hard water deposits building up in the Keurig.

Nice implementation!

This is the float I used. It fits and works flawlessly, 2 years so far.

Thank you! that's actually what I was looking for when I found this guide :) I don't understand the need for the extra electronics, myself.

SyCoQc (author)  veronica.elizabeth.lowe2 months ago

That's also a very good idea... But if space is limited the mini plastic float might be to big. If it fits in the reservoir, it's simpler of course. I've just ordered one to see on which Keurig it will fit.

I had a similar idea though I just used a really small float from Amazon. I will try this electronic method in my Lavica as it may not have room for the float.

Clarkdale449 months ago

Hey, its a very nice project. Can you tell me what amps of Relay you have used?

SyCoQc (author)  Clarkdale449 months ago
hello, it's 40A relay cause I had it on hand. You could use a 5 to 10A without problem. There is even one person that suggested to go without a relay but I'm not sure that the little float switch would handle the load. I prefer a small relay. Thanks

K, thanks, i have one lying around, i got it from an old ups circuit. Its 12v 10A, (N.O).

Very nice. Plan to do something like this. Wonder if anyone has thoughts or experience regarding the use of this float switch instead:

It appears to be able to carry enough current to make the relay unnecessary.

My system is about the same as SyCoQc (his switch bracket is pretty clever) but I used a stainless steel vertical float valve from Ebay (

drilled a hole in the cover) that is capable of carrying 0.5 ampere so the relay is not necessary and it prevents the relay chatter when the switch closes and the inrush to the valve lowers the voltage for an instant. I've been using my level control system for over 18 months happily as I hated hand filling each day. I've also installed it on my Saeco espresso machine. I would recommend installing a throttle valve on the 1/4 line so there is no vibration due to flow. Lastly, I have reverse osmosis water so using brass fittings is not permissible as the water will actually dissolve the zinc in the alloy resulting with leaks. My whole system cost $28 installed. I used to spend 90 seconds filling both machines so I save around 10 hours a year by automating, it was very satisfying. I wish I had thought of the bracket per SyCoQc to avoid drilling the cover.

SyCoQc (author)  Chucktata1 year ago

The "Sensor Float Switch" I've used is rated at -> Maximum Switching Current: 0.5 A and Max Load Current: 1.0 A. So I think I could have done it without the relay but just wanted to be sure. About the bracket, yes it's a good idea because I'm now using a B70 Platinum model and I've simply swapped my little bracket onto the new reservoir. I'll also soon install a small overflow tube to prevent any spills because one time the float switch or something prevented to stop the water flow. I'll update my instructable. Thanks

maclakey2 years ago
Do you find that this system "stutters" a bit? The float sensor I bought seems to be a we bit touchy. Any ideas on making it a bit smoother?
SyCoQc (author)  maclakey2 years ago
mine is smooth but I must add that I've set the tap valve to a very low water flow... If water level rise to fast the sensor assembly may stutter (if I remember a few test I did)
maclakey SyCoQc2 years ago
I did like you said, and it's working perfectly now... thanks.
maclakey SyCoQc2 years ago
that makes sense... I will put a flow valve in line to solve this issue... thanks for the idea!
MikeG-EET2 years ago
I would not buy the cheap 'saddle valve' shown, the kind that pierces the pipe by itself. They are not worth it, and even illegal in some places because they can leak terribly.
pcline22 years ago
This is a nice project that I might try to tackle over the holiday. Could you add an electrical schematic so I don't get the wires mixed up.
SyCoQc (author)  pcline22 years ago
Electrical wiring schematic now added !
Next a decent filtration needs to be added. I always use filtered water since my tap water flavors can vary since it is city water.
blkhawk2 years ago