New Gledhill Stainless Lite Indirect Unvented alarming popping noises.

[John.g]

And the Caleffi balanced cold is also blanked off?.

 

[samba1]

And the Caleffi balanced cold is also blanked off?.

Hi John.g, yes exactly the same configuration as before.

 

[samba1]

Hi samba1,

Did you ever resolve your issue, I have exactly the same symptoms and what sounds like an identical install.

Have a look at this thread, I think the answer is now becoming clearer…

Gledhill Unvented Cylinder Loud Bang Hot Water Demand

Recently had a new heating and hot water system retrofitted in a domestic property. Previous hot water system was gravity fed with a vented cylinder. New system as shown in the photos. Installer commissioned system about 3 months ago and all was working fine. There have since been two faults...

www.plumbersforums.net

 

[TGF5454]

Hi, yes sadly it was a case of swapping the cylinder. Replaced with a Joule and no issues at all now. My Gledhill cylinder had a new serial number sticker over a previous one, to me that suggests it was either reworked in the factory or a returned unit.

The date code was for November and the two numbers were 3-4 weeks apart. The whole situation was suspicious to me. There may be a perfectly good explanation for it but I struggle to see any other.

Check if you have any deformation on the outer skin to indicate any impact to the unit in transit. The other area of suspicion is the combination valve. Could just be a faulty batch. Mine was supplied with the cylinder and was made by Reliance Water Controls. The new Joule cylinder came with Caleffi combination valve.

if you still have the option to swap out I would try to entertain that idea. I understand that it’s not always a pragmatic option.

Thats not good news at all, ours is an early 2021 date of manufacture.

We are also using the RWC combination valve that was supplied with the cylinder. Which Joule unit did you go for? I don't think we could return at this point which is a real shame.

 

[John.g]

Thats not good news at all, ours is a May 2021 date of manufacture.

We are also using the RWC combination valve that was supplied with the cylinder. Which Joule unit did you go for? I don't think we could return at this point which is a real shame.

Would you mind posting a photo of the RWC combination valve installation and also where the expansion vessel is teed into it or teed into the system.

 

[samba1]

Thats not good news at all, ours is an early 2021 date of manufacture.

We are also using the RWC combination valve that was supplied with the cylinder. Which Joule unit did you go for? I don't think we could return at this point which is a real shame.

Hi,

The one I went for is: Joule Cyclone TCEMVI-0200LFC. I spoke to Joule technical who said that model range has 1mm steel compared to others which only have 0.5mm

 

[TGF5454]

Perfect thanks, I will look at them as an option.

 

[TGF5454]

Would you mind posting a photo of the RWC combination valve installation and also where the expansion vessel is teed into it or teed into the system.

Sure Its like this:

 

[John.g]

Just wondering if all those Glendhill cylinders, even the ones with the proper insulation curing time, are behaving like this/these ones where the EV is tapped off the PRV and right at the inbuilt check valve. If the EV pre charge pressure is incorrectly set and not at least 0.2bar < than the PRV pressure it may be enough to upset these paper thin cylinders.

 

[TGF5454]

I believe ours was originally set to 3.0 as per the manual & sticker on the tank but later dropped to 2.8 which reading above is also Gledhill advice.

Shame because it’s a good looking tank, buts it’s way to noisy to live with.