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Banging while heating - Bunn NHB Coffee Maker

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My Bunn has a minimum water pour in amount at 4 cups mark on the pitcher. They more or less boil the water so if you are trying to make less than 4 cups thats not a good idea.Other wise yes they are a little noisy. It may help to use only filtered water as the solids in tap water may be restricting (solids build up) water flow.
I hope this helps you.

Posted on Oct 15, 2009

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VERY low water flow!
Or... No water flow.
This heater as all heaters do, need to have sufficient water flow thru them, or else they Bang like this.
This then creates a problem, for future banging - due to lime up!
The minimal water flow gets so Overheated, that it turns to steam! The steam knocks and pushes the heater around, then the Minerals will precipitate out of the water and forcefully attach to the inside walls of the heat exchanger! Which will then drastically reduce the inner diameter of the exchanger making a much smaller passageway for water to travel thru! This is a major problem to remain this way. It will then need to be dismantled and de-limed to increase the holes once more, and allow a proper water flow.

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1 Answer

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Steam used to move giant monsters of a train across country, you have steam being generated in your heater, that's causing the bang and probably some rockin' & rollin' of the heater itself?
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Hi,
There are two things that can cause this...
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Check and verify water flow through the heater

if that is ok, then the heat exchanger needs to be cleaned

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