Question about Bunn RL Coffee Maker

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Bunn Coffeemaker CWTF35-4


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Hook it up to cold water. It has a heating element in the tank that heats the water.

Posted on Jan 22, 2008


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Posted on Jan 02, 2017


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My bunn coffeemaker NHS-B trip the GFI. Where do I find the code date on my brewer?

The NHS-B has a semi-sealed tank that keeps +1 pot of water heated and ready to brew. Pouring in a full pot of cold water will fill the top tray and allow a slow trickle of cold water into the top which forces hot water to over flow into the brew basket. This continues until all the cold water drains into the heater tank. So the brew is matched volume per volume. UNLESS the thank was empty or not filled prior to brewing. Follow the brewing instructions from Bunn (on line for *FREE* download at
* If it leaks (from the bottom) only when you pour in water. Then your pouring it too fast and over flowing the fill tray. slowdown, watch the level in the tray. do not fill past the lid.
* If it leaks just sitting (not brewing) then there is a hole in the tank. Call for service.
* If it leaks after filling the tray half way. then the top of the tank has a leak, loose, cracked, or missing gasket. There is quite a few gaskets on the lid. Call for service.
* Final; Leaks are always bad around electrical equip. Best to unplug and call for service to be safe.
Aloha, ukeboy57

P.S. If you did splash too much water then wipe up as much as you can. Leave it out on a towel or paper towels to allow the excess moisture to evaporate. If you dump all the water out of the brewer (and tank) then you will need to pre-fill it with a pot of water PRIOR to plugging in the brewer. Follow the set up instructions in the manual. Let it heat up and try again. If it's still leaking then there is a hole in the tank. Call for service.

Dec 29, 2017 | Bunn Coffee Makers & Espresso Machines

1 Answer

My Bunn coffee maker just quit. No hot water, no brewing sounds, no heater. Is it the cord or is it just done? Help!

Unplugged, check the wire connections, heating element and thermostats
You need to have a volt meter for this job.

Jan 18, 2011 | Bunn Pour-Omatic Coffeemaker, 10 Cup White

1 Answer

Hot water leaks out the bottom when filling resevior with water of my Bunn coffeemaker GR10-B

If you will call 800-352-2866 with the model and date code and we will be able to help you resolve your issue.

Jul 01, 2010 | Bunn GR10 Coffee Maker

2 Answers

Can i clean a Bunn coffeemaker with vinegar?

Sure, vinegar is a nice weak acid, no harm at all.

Oct 15, 2009 | Bunn NHB Coffee Maker

2 Answers

Bad tasting coffee

you can always clean a coffeemaker with vinegar, but always pour in cold, so you can do it twice or more, but dont re-use the stuff you just used, wait till it's cold or just use some other.after use clean by let water through 2 or 3 times, (also only cold water)

Jan 28, 2009 | Bunn-O-Matic Coffee Brewer GRW8

2 Answers


You can order a new heating element from the manufacture. But, the crimp connectors and the thermo-fuse may also have to be replaced. You will need the crimp tool for the crimp connectors. You will also need a meter to verify the connections.

If you take the unit to an appliance center they can service it for you. But, you may find the cost of the parts alone to not be feasible.

Jerry G.

Jan 07, 2009 | Bunn Pour-Omatic Coffeemaker, 10 Cup White

1 Answer

I lost my directions to my bunn coffeemaker. Can you tell me how to make the first cup of coffee in a bunn? Is there just one place to pour the water? Fo you leave it plugged in all the time?

it has a reserv tank equal to 2 pots which are hot all the time
the power switch is only for the warmer plate
you get out about what you pour in,

Nov 23, 2008 | Bunn NHB Coffee Maker

1 Answer

The water is not getting hot

You can check to see if the switch on the side of the tank is turned on and is working, but if the problem is with the tank heater itself, you can't get replacement parts for this model unless you can find a broken one at a garage sale or a Bunn service center. You can obtain a list of service centers in your area from

Oct 28, 2008 | Bunn Pour-Omatic Coffeemaker, 10 Cup White

1 Answer

BUNN Pour-Omatic

Most likely it is your tank heater, but look on the top of the tank heater, because sometimes the wire will burn off the top of the element

May 20, 2008 | Bunn Pour-Omatic Coffeemaker, 10 Cup White

2 Answers


The Bunn coffee machine has an internal tank used for holding approx three potfulls of water at just below brewing temperature. When you add water for a potful, the thermostat senses cold water and starts the brew heater. The water level inside the tank comes up and goes through the sprayhead. This "surge" of water, that you call drips is normal. The hot water stratifies to the top of the tank, just like an electric water tank in a house. The internal pot heater kicks in and boils the water already in the tank, raising the water level in the siphon pipe to the sprayhead until the reservoir under the add water opening is empty.

Sep 15, 2007 | Bunn NHB Coffee Maker

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