Introduction: 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).

Step 1: 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"

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

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

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

Next you'll need a Water Level Liquid Sensor Float Switch. 2$ online

Step 6: 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

*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.

Step 8: Fix the Custom Bracket

You will need to make a custom bracket to hold the water line (hose) and the level switch. You can use a thin aluminum plate and then fix it to the reservoir.

Step 9: Enjoy!

Know you have a fully automatic Keurig B40/B60.

See demo video: