BUNN VPR commercial coffee pot, not flowing in a steady stream just dripping

Your spray head has 5 to 6 little holes depending on the model and year, and it looks like you have scale, calcium or lime blocking them.
Since your model is a VPR pour model, you will have less trouble cleaning it with white vinegar than the permanent water connection type. I use a gallon of vinegar and filters for this.

Parts needed:
2 Clean, Rinsed Empty coffee cans
1 Gallon of White vinegar
5 coffee filters
1 Toothbrush, preferrably angled head

Start with your Bunn turned off and place an empty full size coffee can under the pour spout. Now place a filter in the brew basket to catch any fine particles you don't want poured back in the resevoir and heater. You will need to change this filter a few times as the trash starts coming out of your spout.

With the coffee can, brew basket, and a fresh empty filter in place you want to start pouring the vinegar in the tank while catching the water with the coffee can. As it fills with water you will need to dump the can down the drain until the full gallon of vinegar has been poured in the Bunn. Allow the excess water to finish flowing out into the coffee can making sure to leave half the water in the can to pour back into the coffee maker.

By now your tank should be filled with mostly white vinegar, and your coffee can should be at least half full of vinegar as well.
Now you can turn on the lower pot warmer to keep the solution hot and plug your Bunn into the outlet.

Allow 8 to 10 minutes for the heater to heat up and pour the half full coffee can of vinegar into the fill area. Allow the cycle to complete and replace the filter as needed, or if flow begins to slow down.
If your heads are clogged, use the toothbrush to clear the holes as the vinegar is flowing until you see all holes flowing vinegar.

Chunks of trash will dislodge in your heater tank and flow to your spray head, so keep that toothbrush ready.

Do this at least 5 times, then allow the Coffee maker to sit 30 minutes with the heater on to finish dissolving the lime and calcium deposits in the tank.

After 30 minutes start flushing the system with clean water to rinse out all of the vinegar, or until you can no longer smell vinegar in the coffee can.

Good Luck!

The unit may simply need to be decalcified. You may need to use a toothpick to remove blockages in the spray head, and there may be a flexible wire to assist in removing blockages behind the spray head leading to the tank (refer to owner's guide). If these measures fail it may be a problem with the thermostat/electrical system. For support go to:
http://www.bunnomatic.com