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Espresso: Espresso Mods and Restorations
Bunn ES-1A
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Senior Member

Joined: 4 Feb 2014
Posts: 18
Location: Connecticut, USA
Expertise: Just starting

Espresso: Bunn es-1A & Bunn ES-1A-F
Grinder: Bunn es-1g
Posted Thu Feb 20, 2014, 7:08pm
Subject: Bunn ES-1A

I have an older BunnES-1A that I have never descaled.    It is plumbed into a bottled water system but I notice that the water flow has slowed down.  I regularly clean the group head but am sure the boiler and piping must have mineral buildup (it was used in a bagel shop before I got it).   Any thoughts on how to go about a through descaling of the boiler and. Plumbing?  Thanks
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Senior Member
Joined: 4 Feb 2009
Posts: 29
Location: Sydney, Australia
Expertise: Professional
Posted Sat Feb 22, 2014, 6:01pm
Subject: Re: Bunn ES-1A

Using apple cider vinigar is the safest option for descaling coffee machines. It's non toxic and inexpensive.

Just put the inlet pipe into a bottle of the vinigar and run it through the system. You could also adjust the water level probe (if possible) to be slightly higher than normal by simply moving the probe out of the boiler by about an inch or so.

Use a mixture of 50/50 with water and try not to soak for longer than an hour, after that time, empty the machine, rinse with water and repeat the process.

Alternatively, there is an Urnex branded coffee machine descaler which is very good.

If you find that this method had dislodged a large particle which has blocked some part of the water from coming through the system, you may have to check the flow meters (if installed) or other part of the machine for the location of the block. Just eliminate the cause by checking the system, starting from the inlet pipe.

Alternatively, take apart the entire machine, soak all the pipes and boiler (careful not to get any electricals wet) in a coffee machine descaler solution, replace all the rubber seals (including the boiler gasket) and put back together.

Also, don't use regular descaler, it will react to some metals negatively. Use coffee machine descaler.

My micro-roastery is up and running, be sure to check it out! www.beanofatree.com.au
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Joined: 25 Nov 2007
Posts: 8,204
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Feb 25, 2014, 7:42am
Subject: Re: Bunn ES-1A

We generally advise to use citric acid or a commercial descale product. I have never used the apple cider vinigar but that is not to say it will not work, rather it is just not the method most used here.

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Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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