Brew12
Electrical Gru
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Reef Tank 365
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My Tank Thread
Sorry for your problems!We've had problems with these heaters before and have taken them out of our other tanks because they made the residual current breakers(?) go off a lot.
In the US we call these GFCI's.
I'm very surprised you are not required to use RCD's on your temporary tank systems. I would have thought that would be mandated for anything related to a public aquarium.
I'm also surprised you didn't throw the heaters away when they started tripping RFD's. Your biggest problem is probably the melted plastic, but I would do a copper test on the water if you can.