OK - but did the heater shatter? (sorry couldn,t resist - I hope this wasn't your setup)
I think there is a big recall on those "stealth" models - for exploding.
On a serious note though - we should all be careful with things that plug into the wall and saltwater tanks. Power-strips under/around salt tanks have a tendency to want to corrode plugs - create heat and eventually catch fire:
(this ain't the first one like this I've thrown out, it's about the 3rd in 10 years)
I've found most power-strips and all the plugs that plug into them need to be cleaned & inspected every year, after the 1st year of service. About once a year now days I have to take a wire brush and clean every plug that goes into a strip, and if any signs of overheating on the plug/strip appear (like above) throw the whole strip and buy new ones.
You don't have to dump water into a powerstrip to get this effect - it happens over months and things corrode where you cannot see them, and the corrosion causes resistance, which = heat.
Just like at the beach - the area around any saltwater tank is a salty environment, and some areas can even be directly exposed with salt creep/spray. This RAPIDLY accelerates the corrosion of the copper plugs both male & female ends, and all these things gotta be checked/cleaned about every year to 2 yr max.
Some plugs are better quality than others, as some are nickel plated (which is really corrosion resistant) while others are brass or copper (much less resistant). It's the brass & copper ones that I've had heating/arcing problems with over the years.