Help diagnosing corrosion on expansion tank?

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Dni23

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Afternoon!

Hoping that there are some people on these forums who may be able to let me know what's happening to this tank, and how big of a problem this is!

As per the photos there is what looks to be corrosion on the bottom of what I believe to be an expansion tank, if I've got that right. It's been there for at least a few years and it's gradually getting bigger but very slowly.

What's happening to this tank, and more importantly how much of a safety concern is this? Is the best solution to replace this, or if it is just an expansion, cut it out and remove and join the pipework back up?

If it matters we have a gas boiler, and I don't believe the immersion heater inside the larger tank is used.

Any advise and help on this would be much appreciated as it's becoming a bit of a worry. Thank you!
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Fitter30

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Yorkshire in England? Never seen anything like your setup. But that devise has city water pressure on it. Needs to changed out now before in blows out.
 

Reach4

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Boiler, as in heating the house?

I don't think that is an expansion tank; those usually only have one port.
 

Dni23

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We have a gas boiler, I believe both heats the house and the radiators, but it's a very old boiler, most likely 80's when the house was built, and this is Leeds yorkshire.
 

Michael Young

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Afternoon!

Hoping that there are some people on these forums who may be able to let me know what's happening to this tank, and how big of a problem this is!

As per the photos there is what looks to be corrosion on the bottom of what I believe to be an expansion tank, if I've got that right. It's been there for at least a few years and it's gradually getting bigger but very slowly.

What's happening to this tank, and more importantly how much of a safety concern is this? Is the best solution to replace this, or if it is just an expansion, cut it out and remove and join the pipework back up?

If it matters we have a gas boiler, and I don't believe the immersion heater inside the larger tank is used.

Any advise and help on this would be much appreciated as it's becoming a bit of a worry. Thank you!View attachment 98594View attachment 98595

Take a picture of the mfg, model, serial number. take picture to plumbing supply house and have them source you a new tank. Replace the tank. Plumber will likely charge you $1200-$1600 to replace it for you.
 
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