Instruction to repair leaking geyser panel on 150litter kwikot geyser

Instead of trying to repair it yourself, you might try calling a plumber. They are trained in repairing leaks and could probably do a more efficient job. This way you can have it done with a reassurance that the leak is fixed for good. https://www.ezflowplumber.com/leak-prevention-n-slab-leaks

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It sounds like the tank is leaking. Without the information as to where the leak is the only answer I can suggest is to replace it.