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chiror0b
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Joined: 17 Mar 2013
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Location: Auburn
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Posted Tue Apr 2, 2013, 4:35pm
Subject: hot water tap HX machine question
 

I have a new Vibiemme Domobar Jr, which is my first "real" machine.

It has a hot water tap, and I have been trying to pre-heat the cups with the hot water.  I have found that in a cappuccino size cup I can get MAYBE 1/4 of a cup of water, and then only steam will come out of the tap.

Is that the way it is supposed to work, or is my unit set incorrectly?

I expected to be able to fill a cup with hot water for tea from the hot water spout, but it doesn't seem to be able to do that.
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fnacer
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Posted Tue Apr 2, 2013, 8:57pm
Subject: Re: hot water tap HX machine question
 

That isn't right at all. The hot water tap draws water from the bottom of the boiler. So, for steam to come out of the hot water tap, you'd have to draw all the water out of the boiler. And way before you get there, the water level probe should have detected the low water level and the pump should have kicked in to refill the boiler.

Is the pump turning on when you pull a shot? Does it turn on to refill the boiler?
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chiror0b
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Posted Tue Apr 2, 2013, 9:35pm
Subject: Re: hot water tap HX machine question
 

Yes, the pump turns on and cycles during / after a shot, and I have allowed the water level warning to come on one time, that part works as well.
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NobbyR
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Posted Wed Apr 3, 2013, 2:14am
Subject: Re: hot water tap HX machine question
 

Using hot water from the machine to pre-heat the cups is a generally good idea and also common practice. But I find it much more convenient to use water from the brew group, e.g. the cooling flush, because when you pull hot water from the boiler via the tap, especially when it's larger quantities like for a cappuccino cup, pressure will fall, and the machine will draw cold water from the tank, so the machine has to heat up again. This won't happen when you use the HX line (brew group). Also the hot water from your cooling flush fulfills another purpose before getting dumped.

The Vibiemme Domobar Junior has 0.5 liter boiler, not all of this volume is made up of liquid water, part of it is steam. So when you pull hot water for a cappuccino cup you might actually drain the water inside the boiler to a point, when the pump turns on to refill the boiler. Also the steam boiler is under pressure, so when you turn on the hot water tap the water coming out is more than 212F (100C) hot at first and evaporates. That's why there's so much steam.

 
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calblacksmith
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Posted Wed Apr 3, 2013, 3:58am
Subject: Re: hot water tap HX machine question
 

You should not get steam but I the water will go cold as you use up the water, just like if everyone took a shower at the same time you will run out of hot water.  The brew group will not reu ou of water in a hx machine.
When drawing water from the water side, draw slowly so the heater gets a chance to warm the water.

 
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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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chiror0b
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Joined: 17 Mar 2013
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Location: Auburn
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Posted Wed Apr 3, 2013, 6:04am
Subject: Re: hot water tap HX machine question
 

The water does come out slowly, not at all like a faucet.  

I don't get anywhere near a cappa cup of water, I can't actually because it is all steam.  It is almost like purging the steam wand, water squirts out for a second, then steam starts. Pretty much the same only with a bigger nozzle it doesn't squirt out, but does swap to steam.

Since I have only had the machine for a week, maybe I should contact 1st-line to see if I got a defective unit?
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Coffeenoobie
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Posted Wed Apr 3, 2013, 8:25am
Subject: Re: hot water tap HX machine question
 

Take a video and let 1st-line see that.  It doesn't sound right even with what Cal and others have said.

 
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emradguy
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Posted Wed Apr 3, 2013, 9:20am
Subject: Re: hot water tap HX machine question
 

The water is very hot, much hotter than 212F (the boiling point of water, at 1 atm).  I'd guess your boiler is set around 255F?  If so, the pressure is much higher than 1 atm inside it. I suspect you're mistaking the water coming out going to steam as it exits (due to lower pressure from being outside the boiler) rather than actually having steam come out of the wand.  It splashes around and burns when it hits your skin, yeah?  I personally find it easier to draw water into a larger vessel and then pour it into the cups to pre-warm them, or, like Nobby said, use brew water from the group to pre-warm cups for convenience.

 
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Always remember the most important thing is what ends up in your cup!
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scanfield
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Posted Wed Apr 3, 2013, 9:30am
Subject: Re: hot water tap HX machine question
 

I wondered the same thing as you when I got my HX.

I use the hot water wand and I get a sputtering mess of steam and water. After about 4 oz, the pump kicks on. At this point, I always close down the hot water and wait for the pump to finish because it's a really bad idea to draw the water down to the point where the heating element is not submerged.

I've found that the hot water wand is almost useless except for descaling. I also use it to pull some water out of the boiler every day to keep the water in the boiler a bit fresher. I wish I could use it for tea and americanos, but it's too painful. A kettle is much easier.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,833
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 Wed Apr 3, 2013, 1:44pm
Subject: Re: hot water tap HX machine question
 

I guess, I missed the boat in explaining.
The water STARTS AS STEAM as the boiler is much higher than the temp of boiling water, as you continue to let water out, the pump kicks on and starts to fill the boiler, diluting the heat of the water in the boiler. There is a fine line where I can continue to draw water from the boiler in my machine and it stays hot. Too fast and the temp drops like a stone and the whole thing comes to a halt without much water in the cup.

 
In real life, my name is
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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