Megaflo UVC - Very Loud Noise When Hot Tap Opened

[techweb]

Hi,

I have noticed that when a hot tap is opened for the first time after a heating cycle (in this case a bath tap), the water flows for a couple of seconds and then there is a very loud noise as can be heard in the video.

Any ideas what it may be? I couldn't deduce the source. The EV was recently checked and pressure increased from 1 to 3 bar per instructions but notably it did this before. I just at that time didn't know the trigger. It hasn't always done this however, probably the last couple of months or so.

Thank you.

 

[ShaunCorbs]

Yep seen it many times

 

[techweb]

Yep seen it many times

I wasn’t aware the baffle making this noise was common prior.

 

[ShaunCorbs]

I wasn’t aware the baffle making this noise was common prior.

Guess you missed post 3

 

[techweb]

Guess you missed post 3

Very good point. I just wasn’t aware that you meant it made the noise. Thinking about it now. I feel a bit silly.

 

[John.g]

Probably influenced by the ceiling having to come down to install new one, post #8.

 

[techweb]

Probably influenced by the ceiling having to come down to install new one, post #8.

Interestingly, my plumber did some measurements whilst he was here and it can come out but the hatch will need to be removed so not too much damage / disruption.

 

[John.g]

As a aside, I see OSO say you can increase their UV cylinder capacity by removing the dip tube and installing a EV, assuming that these too have a baffle, then I wonder why this isn't causing noise if floating about, albeit, in one piece, maybe because the cylinder is now full to the top, no air bubble. If the megaflow could be confirmed full, air bubble completely depleted, would the pieces of plastic float and be hard up against the top of the cylinder with no noise??. also no bits of plastic might flow out as the dip tube end is a 1/4 way further down the cylinder.

Also I see that the OSO effectively charges the bubble with a empty cylinder which should give a 5 fold increase in the air bubble to ~ 50L vs 10L in a 210L cylinder after a full reheat, maybe they don't have a baffle.

 

[techweb]

As a aside, I see OSO say you can increase their UV cylinder capacity by removing the dip tube and installing a EV, assuming that these too have a baffle, then I wonder why this isn't causing noise if floating about, albeit, in one piece, maybe because the cylinder is now full to the top, no air bubble. If the megaflow could be confirmed full, air bubble completely depleted, would the pieces of plastic float and be hard up against the top of the cylinder with no noise??. also no bits of plastic might flow out as the dip tube end is a 1/4 way further down the cylinder.

Also I see that the OSO effectively charges the bubble with a empty cylinder which should give a 5 fold increase in the air bubble to ~ 50L vs 10L in a 210L cylinder after a full reheat, maybe they don't have a baffle.

As far as I am aware, the Megaflo is not something that has this feature or can be dismantled. For example they won’t replace the bubble / baffle. This would make sense to be serviceable in the field.

 

[John.g]

As a aside, I see OSO say you can increase their UV cylinder capacity by removing the dip tube and installing a EV, assuming that these too have a baffle, then I wonder why this isn't causing noise if floating about, albeit, in one piece, maybe because the cylinder is now full to the top, no air bubble. If the megaflow could be confirmed full, air bubble completely depleted, would the pieces of plastic float and be hard up against the top of the cylinder with no noise??. also no bits of plastic might flow out as the dip tube end is a 1/4 way further down the cylinder.

Also I see that the OSO effectively charges the bubble with a empty cylinder which should give a 5 fold increase in the air bubble to ~ 50L vs 10L in a 210L cylinder after a full reheat, maybe they don't have a baffle.

For interest,
Oso technical inform that there is no baffle in their cylinders, so it seems that repressurizing a almost empty cylinder without a baffle will give, presumably, the same times between recharging as repressurizing 25% of the vol of a baffled cylinder.