Billi Taps Vs. Mains Fed Water Machine   There are many reasons that your business may be considering filtering the water that comes into the office. There are many solutions to choose from when you decide to filter the water coming into the office. You can choose from a Billi Taps system or even from Mains Fed Water Machines. Billi taps are filtered drinking water systems that provide instant boiling and chilled water. These products were recognized for their ability to save space in an office while still providing clean water to the office. This means that the water goes through the main supply.