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Originally Posted by feathers
"Why would you want a solid state one? A standard relay is much cheaper and more easily obtainable, and doesn't suffer from heating issues." - Uhh.. because a solid state relay is much more reliable? A mechanical relay will eventually wear out. A solid state relay will have a much longer lifespan and also doesn't suffer from heating issues. I use a 13-amp mains relay which is activated by a small voltage and doesn't generate any heat.
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On the other hand, the odds are your pump will wear out long before a mechanical relay.