i know the heater in question was from a large system but i'm assuming the same problems plagues them as well. Clydes, i agree! customer support has been 110%, Craig always helps without question!
In my experience the problem with the small 300w old style heaters is the silicon plug in the tops get eaten by the solution. It helps taking them out when not in use "caswell recommends this" but eventually the seal breaks and your tank starts to smoke. I tried to seal the tops with extra silicon but i gave way too. I've found even in the ceramic units the seal loosens after a few weeks but it must have another seal under that, there hasn't been a problem. The wall mounted control units they sent me are working very well with no problems! I don't think the heater problem is caswell fault but the vendor couldn't produce a reliable product.
I'm upgrading to a 16gal system how are the 1000w units placed and controlled?
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