Re: HELP: wall switch sparks when turned off

yes, start worrying.
who: you and an electrician
what: check the amperage of the heater and the switch to see if switch
is sufficient amps. check the circuit breaker size and wire size and
see what other devices may be sharing the same circuit.
where: at the heater electrical plate, at the switch rating label, at
the electrical panel.
when: asap
why: to avoid overheating of electrical items and avoid repeating the
burnout of a heater if it was caused by underrated switch or overloaded
circuit or insufficient wiring size.
visible sparking is not normal.
faq at:
http://www.landfield.com/faqs/electrical-wiring/part1/

.

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