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Discussion Starter · #1 ·
Hello,

I have just bought the Dual Boiler Leva that can run on plumb or tank water. I'm running on tank water with Tesco stuff. I'm getting used to the machine since upgrading from my Gaggis and have been looking at the pressure guages while brewing, etc. The steam hovers around 1 bar and the brew pressure goes between 2 and 9 bar, with 9 bar showing while actually brewing.

I have noticed water dripping from the pipe behind the group while warming up, which I understand is normal. Also while brewing and using a blank filter for adjusting/ checking pressure or back flushing, water runs out of the pipe. This also happens when I pull a shot. I get as much dumped water in the drain tank as I do through my coffee in the cup. It seems like quite a lot. I've seen an old post where someone bought silicon tube and routed it back to the tank - just like my Classic does. I'm planning to make this simple change, so water just get fed back to the tank. My question was how much should be draining out while in use?

I'm trying to get my grind right and am still using my old MC2 grinder while I wait for the Sette or Mini Mazzer. Is my grind too fine, meaning lots of back pressure and water blowing off to the drain. My coffee puck seems damp after I pull a shot. I'm planning to measure out 60ml over approx 25 secs to get an idea. That seems to be recommended.

Is there some way to adjust this, so less water drips through? Or is it just completely normal.

Please note, this is not the flush of water from the bottom of the group when lowering the lever. It is the small pipe to the rear of this that is dripping while pulling a shot. And a few drops while warming up - which I'm not too worried about.
 

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Don't make that change - as the liquid being expelled is not just clean water.

When you stop your shot go half way then after a couple of seconds close the lever fully.

This will take any excess liquid off the top of the puck and shoot it out the exhaust chute into the drip tray.

This follows the same route when you backflush (using the blind filter)

Expect to get about 30 mls of water (a shot) through this pipe.
 

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Hello and thanks for the reply.

I have put a small tube on the Opv exhaust (tiny pipe behind the group) into a glass, another to catch my shot and another to catch the whoosh of water from the bottom of the group, when the lever is lowered.

I just made my grind a tad finer and measured around 15g into my double portafilter. It took 29.30 secs to extract 60ml.

During this time 80 ml of water came out of the little pipe and 30 ml whooshed from the bottom of the group when the lever was lowered. That's 170ml of water to make a 60 ml double shot.

I'm not concerned about the extract time for now or the amount of bottled water I'm using to make the shot. It's £1 Tesco stuff. It's the amount that is running into the drip tray that I am puzzled about. The Gaggia I had before had 2 pipes and just used to trickle a small amount down the little tube at the back.

You mentioned about 30ml through the pipe. I'm getting 80ml. Is this completely normal for this machine? Sorry for being fussy and pedantic if this is standard.

I did notice the coffee puck was dryer after waiting at the middle stage.
 

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I've usually had less than 60mls (mostly about 30) but that is probably just my machine (Alex Duetto IV)
 

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I thought the pipe was just the exit for the diverted water from the OPV. On my machine the Teflon pipe goes into the reservoir and isn't connected to the drain pipe below the group. If you plumb in you'll have to use the drain pipe, obviously...

Quantity is releated to flow rate, which is related to pressure. Have a look around for recommended flow rates (from memory about 220ml in 30 seconds without the portafilter/basket installed). Changing brew pressure will affect how much water is ejected from then drain pipe and how much water runs through your group in 30 seconds.
 

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That. For reference, my Pro-700 does not "drip" whilst brewing a shot. It does drip a bit during warming up and a little afterwards.

Someone had the same issue here a while ago, I can't seem to find the thread.
 

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If I have a brew later, I will clear my drip tray, measure and report back. I have a Leva, currently using tank fill, it's a vibe pump version.
 

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Discussion Starter · #9 ·
wilse said:
If I have a brew later, I will clear my drip tray, measure and report back. I have a Leva, currently using tank fill, it's a vibe pump version.
Could you let me know if you have one or two pipes going to your tank please?

I have seen two on YouTube and mine has one.
 

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I've got a Brewtus and:

1) No water "drips" from anywhere before/during/after brewing (well except a few drips from the pf immediately after)

2) When I flick the lever after a shot the pressure relief "squirt/gush" (from the pipe behind the brew head) is a fraction of a second and a "shortish" shots worth...ie I haven't measured it but it doesn't seem like an awful lot.... (but as I also use bottled water the Tight-arse in me does sometimes think "I've paid for that water!!")

I have two pipes going into the top of the tank.......
 

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I have two pipes going into the tank, and similar to Drewster, I don't think a lot of water is used.

From memory, water only really comes from the bottom of the group after pulling the shot and detaching the PF...

...I can't remember if anything/much comes out of the smaller metal 90 degree bend pipe.

I'm running on Volvic, so will be interested to find out!
 

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Discussion Starter · #12 ·
I've emailed Bella Barista as its one of their machines and was bought in 2015. Theh were happy to transfer warranty from the forum member that owned it before.

I'll see what they advise. Strange how some have two pipes when I have one. Must be to do with the reservoir / plumb in switch.
 

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OK, here are my results:

Machine on for 30 mins, brew boiler only.

No excess water.

Heated glass with 30g of water.

No excess either.

Brewed an espresso with 39g weight.

Once lever up, excess water ejected from the group [at the bottom] nothing from the bent microbore pipe.

Weight of excess was 39.5g!

Machine is November 2014.

Hope this helps?
 

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Ok I have a brewtus 4 vibe pump and mine also has a constant stream of water from the small pipe behind the opv exhaust when brewing I've always thought it to be normal and never questioned why but now someone had mentioned it makes me wonder I only have one tube into the reservoir also anyone else with a 4 have the same issue
 

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Discussion Starter · #16 ·
Hello all,

I've emailed and called Bella Barista and I'm waiting for a response. Please see a video on YouTube which explains how to check pressure and Opv pressure. It makes me think that my machine is set for plumb in, where water drains out to the tray and presumable to a mains drain.

Hope I'm not breaking any forum rules.

 

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Discussion Starter · #17 ·
You'll see no water comes from the pipe during all of this. I would have dumped 150ml in this time. its telling he has a second tube back to the tank.

I posted a comment and they promised to ask Tod for an answer. Good stuff.
 

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I know it's not the same machine but on my R58 the little outlet behind the group exhaust only drips a little bit during the warm up phase when the water is expanding as it heats. It doesn't drip from there once up to temp or during a shot. There is a reasonable amount of water that comes out of the exhaust after the lever is dropped to stop the shot - by eye I'd say maybe 15ml. It has never entered my head to actually measure it so I don't know exactly. As Glenn said yesterday - if you drop the lever to the halfway point briefly before pushing it all the way down, you get less water through the exhaust and drier pucks as the water from the top of the puck has a chance to go through the valve before you close it, and you've effectively shut the pump off slightly earlier in the shot, reducing the amount that goes to waste slightly.
 

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I think the OP refers to the OPV and not the exhaust valve from the e61. So that any water diverted is thrown away instead of back in the tank(like in the Gaggia Classic for example). @dmdrabble, if you could video it, then things will be much clearer.
 
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