I have a bunn coffee maker the nhbx is the # it is leaking water from the resevoir

Here is the manual for your unit:
Bunn NHBX Use And Care Manual

The reservoir is not removable.

lift filler led and remove 2screws on top of reservoir
Then remove 4 screws that hold the reservoir on an you should be able to lift it off

The leak is most likely between the water reservoir and the tank. Bunn uses a soft silicone seal for that connection that gets compressed over time and starts to leak water whenever you make a pot of coffee.

It's planned obsolescence. Bunn won't sell you a new seal. So you have to improvise. But it's simple enough to do.

Remove the top cover and the plastic water reservoir right below it. Don't tamper with the little valve that opens when you close the lid.

Look for the seal. It could be stuck to the bottom of the reservoir, or sitting loosely on top of the metal tank. Make sure to preserve its top-to-bottom orientation (don't put it back in upside down).

Apply a narrow bead of clear silicone into the grooved side of the seal. Press the seal gently onto the reservoir, then apply a thin layer to the smooth side.

Re-install the reservoir and reassemble the unit.

lift filler led and remove 2screws on top of reservoir
Then remove 4 screws that hold the reservoir on an you should be able to lift it off

It sounds like you might have a problem with the water tubing. If you will call Customer Service at 800-352-2866 we will be happy to assist you with this issue.

If you will locate the date code on the bottom of the unit and then call Customer Service, the machine will be replaced at no cost or if over 3 years old, at a reduced price.

I work for BUNN. Here's a link to the manual for your NHBX-B
http://www.bunn.com/pdfs/retail/usecare/41756.0000_STX_NBX_U_C_English.pdf

before plugging in place your empty filter basket in the coffee maker and place a pot under it. Slowly pour in two pots of water using the pour pitcher. Now you can plug it in. it'll take 15 min to heat up first time . when you brew your first pot leave your water level a little short,because the water will expand (only the first time)