Jul Bujh is a free Android app developed by Zaheen Machines that allows you to control your gas water tank heater's thermostat using the Jul Bujh timer device. This app works with Android 4.3 and above and utilizes Bluetooth Smart technology to change the timing preferences of your device.

With Jul Bujh, you can easily set the time for your gas water tank heater to turn on and adjust the intensity of the heat. The app also promises to offer notifications and information sharing features in the future. The app's interface is easy to use and straightforward, making it simple to set up and control your gas water tank heater with just a few taps on your Android device.

Overall, Jul Bujh is a handy and practical app for anyone who wants to control their gas water tank heater with ease. It's a great tool for those who want to save energy and money by heating their water only when they need it.