Hi Mike_B ... ok I don't have a great answer for you. I went into work and pulled the service manual that a vending machine company left for me in case I needed to do a little work on the unit. I went through the manual and it does not address issues with the hot water faucet and the water/coffee level. I thought it might have something but the manual itself is fairly technical. If I wanted to adjust the unit's solenoid valve, we'd be in good shape but regarding the spigot I couldn't find any info.
I did a little searching online. I did come up with a tech service email address for Bunn. The might be able to answer your question. You'll need to give then your unit serial number. I also included the website address as well if you want to check that out. email: email@example.com. also www.bunnomatic.com
Sorry I couldn't help out better. For a moment I thought if I could answer this too, I'd write a separate hub on this solution. No dice. Thanks for the question though.