Joule Horizontal

BigClick · 1 Dec 2018

Had a Joule horizontal cylinder fitted recently and when the hot tap is turned on there is a short period where the pressure is very high. This drops off to what I consider normal after about ten seconds.

I have noted in Megaflow threads reference to bubble regeneration to solve the same symptoms however the Joule cylinders are not the same design and I don’t know what the equivalent process is or indeed if there is a different root cause producing similar symptoms.

Has anyone had similar experiences with Joule Horizontal cylinders?

dilalio · 1 Dec 2018

How recent is recently? Is it a year and due for its annual service? Either way, get the installer back.

BigClick · 1 Dec 2018

It’s been less than a month since the install and it was like it from the first time we used the tap.

I asked the installer about it and he said it’s normal and/or it might be the tap. (We only have one tap so far)

I can’t see myself asking the installer back unless I can demonstrate that it’s not the tap causing the issue.

Im concerned that if it is not the tap then why would the installer dismiss the problem as tap related or normal. Was it because he doesnt know or doesn’t want to bother fixing it???

Either way if it’s a straight forward task to check and resolve I would prefer to DIY

ianmcd · 1 Dec 2018

BigClick said:
Had a Joule horizontal cylinder fitted recently and when the hot tap is turned on there is a short period where the pressure is very high. This drops off to what I consider normal after about ten seconds.

I have noted in Megaflow threads reference to bubble regeneration to solve the same symptoms however the Joule cylinders are not the same design and I don’t know what the equivalent process is or indeed if there is a different root cause producing similar symptoms.

Has anyone had similar experiences with Joule Horizontal cylinders?

The Joule doesnt have a bubble like the megaflow, the Joule has an external expansion vessel, white vessel with a flexible braided hose normally, they both do exactly the same thing, do you have any water dripping at the tundish ?

dilalio · 1 Dec 2018

BigClick said:
It’s been less than a month since the install and it was like it from the first time we used the tap.

I asked the installer about it and he said it’s normal and/or it might be the tap. (We only have one tap so far)

I can’t see myself asking the installer back unless I can demonstrate that it’s not the tap causing the issue.

Im concerned that if it is not the tap then why would the installer dismiss the problem as tap related or normal. Was it because he doesnt know or doesn’t want to bother fixing it???

Either way if it’s a straight forward task to check and resolve I would prefer to DIY

Fair enough.

Was the tap existing before the UV?
Were you on gravity HW beforehand?
Maybe the tap is for low pressure system!
If none of the safety discharges are letting by and the tundish is not showing evidence of let by, then system is working within safety parameters.

BigClick · 1 Dec 2018

ianmcd said:
The Joule doesnt have a bubble like the megaflow, the Joule has an external expansion vessel, white vessel with a flexible braided hose normally, they both do exactly the same thing, do you have any water dripping at the tundish ?

Thanks for clarifying that.

Installer ran a copper pipe direct to
The outside to drain. He said there wasn’t enough room for the tundish.

I will look outside to see if it’s dripping when I get up tomorrow.

The expansion tank is laying on its side next to the cylinder. Can I check the pressure in that and what should it be?

Thanks again.

BigClick · 1 Dec 2018

dilalio said:
Fair enough.

Was the tap existing before the UV?
Were you on gravity HW beforehand?
Maybe the tap is for low pressure system!
If none of the safety discharges are letting by and the tundish is not showing evidence of let by, then system is working within safety parameters.

The tap is from a imperial half inch pipe and was new in circa 1975 judging from the onyx handle and green basin.

Before the Unvented it was a combination boiler.

ianmcd · 1 Dec 2018

it is not as easy as just checking pressures, it has to have the tundish installed, if you have water dripping from the outlet let us know and we will advise further

Razor900 · 1 Dec 2018

Pictures of the install would help

muggles · 2 Dec 2018

What is your incoming cold water mains flow rate? What's the static pressure? I'm wondering whether your mains simply can't keep up with the demand of running the cylinder....

BigClick · 2 Dec 2018

muggles said:
What is your incoming cold water mains flow rate? What's the static pressure? I'm wondering whether your mains simply can't keep up with the demand of running the cylinder....

When I measured the pressure before instal it was 3.5 bar

dilalio · 2 Dec 2018

BigClick said:
When I measured the pressure before instal it was 3.5 bar

And the flow rate? Can't see this being the issue though.

How comes you only have 1 hot tap (or have I misunderstood things?) are you in the middle of a refurb or something? Best thing would be another hot outlet so you can compare results and rule in/out that old tap.

BigClick · 2 Dec 2018

dilalio said:
BigClick said:

When I measured the pressure before instal it was 3.5 bar

Click to expand...

And the flow rate? Can't see this being the issue though.

How comes you only have 1 hot tap (or have I misunderstood things?) are you in the middle of a refurb or something? Best thing would be another hot outlet so you can compare results and rule in/out that old tap.

I only measured the flow rate from an old tap in the kitchen and it was 19 litres per minute.

That was with a black half inch copper supply which I have since replaced with 32mm MDPP

BigClick · 2 Dec 2018

It’s a refurb so we only have one tap. We will have other taps in two weeks time.

dilalio · 2 Dec 2018

BigClick said:
It’s a refurb so we only have one tap. We will have other taps in two weeks time.

Then why not nip to one of the sheds and pick up a bib tap for a couple of quid. Rig this up temporarily on a hot pipe somewhere and see what results you get?

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Joule Horizontal

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