Mixergy Tank Failure

bontwoody · 2025-09-13T05:40:14Z

Hi. I had my Mixergy tank fitted nearly three years ago and on the whole I've been very happy with it. A week or two ago we noticed a small leak on the floor beneath the piping. Initially I thought it was a leakage compression joint which I nipped up. This week I was woken by the sound of water and saw that the tank was discharging water via the tundish when heating. The most likely reason seemed to be a low charge in the expansion vessel, so I removed this and checked it. It was at 50psi. I've contacted mixergy and they suggested I reduce this to 2.5 bar and monitor the situation. It was at this point I noticed that the side of the tank seemed bulged out. When I had the tank installed the plumber pointed out to me a slight bulge in the outer case which I put down to over zealous insulating foam insertion at the time. I recontacted Mixergy and they told me to stop using the tank and they would replace it under warranty. That was Wednesday and I have heard nothing since. What I would like to know is what might have caused the problem and if it lies with the tank or the installation by the G3 plumber or the failure of a part, presumably either a valve or the expansion vessel which seems fine. Images attached. Any comments welcome. Thanks

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Domestic Hot Water & Cylinders

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Mixergy

(@mixergy)

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16/09/2025 10:27 am

Thank you for raising your concerns. Customer safety, service and appliance quality are our highest priorities. We’re sorry for the worry this has caused.

Our team is already working to get this resolved under warranty. We’ve advised you to stop using the cylinder and we’re coordinating with our service partner to arrange a replacement. We’ll follow up directly to confirm the appointment details.

For privacy we won’t discuss diagnostics publicly, but we’ll complete a full assessment and share our findings with you.

In the meantime, please keep the unit isolated (power/heat inputs off). Thanks for your patience, and for flagging this with us.

👍

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