Electrical doodad's Question

[ScubaSteve]

I use them for a number of things. Where they really kick butt is high speed switching... Which I assume isn't what you're looking for. Really, it doesn't matter which one you use for your purposes. The SSR will run hot but is silent. If you need to switch big currents the SSRs can get pretty toasty and can sometimes need heat sinking (I don't imagine you'd need to for your purposes). The mechanical relays are the flip. The only reason I'd maybe use the mechanical over the SSR for certain applications is that they tend to fail open/shorted, which if it is being used on a heater, could be problematic.