Expansion Vessels

[cr0ft]

Quick one folks. I have a spare potable water expansion vessel kicking around our unit. Rather than skip it, I was wondering if I can use it for a sealed CH circuit? I know you can't do it the other way round but my understanding is potable water expansion vessels are built to a better standard, i.e. mould resistant membrane. What do you guys reckon? If in doubt I will chuck it in the skip but would prefer not to waste it tbh.

 

[oz-plumber]

Can't see any problems with using on heating system.

You may have to check the charge - might be too high for heating system

 

[1Steven]

If you use it in your unit you could say it's for training!

 

[Best]

I think you can use it for a heating system no problem.
It will mean the water is not in contact with the metal vessel, as the potable vessels membrane is normally basically a balloon for holding the water side. So better than a heating vessel as yours won't corrode while membrane remains intact.
I would never bin it anyway as must be worth twice what an ordinary heating vessel costs.
As oz-plumber said, you will need to reduce the precharge to suit your heating system, - normally I do the precharge at 1 bar and keep system fill charge at little more cold for most ch systems

 

[missplumb]

check the operating temperature for the diaphragm, potable may be lower than a heating one, heating vessels are only usually rated to 70 degrees

 

[bright spark]

I think some potable 1s can't take high temperatures. Just check d label!!

 

[Scott_D]

Can you contact the manufacturer to get conformation?