retrolefty:
RPCoyle:
The pump relay that Jeffmans speced out looks like a solid state. I have had no trouble with high current solid states, but then I run only resistive loads that don't kick back. The trick I use to avoid lots of heat is to use a relay rated at twice the amps. That way I only need a good heat sink and a little ventilation. The cost isn't that much more. The old kiln relays were all duty cycle contacts and they were always needing replacement... but they were switching probably a lot more than most applications.
No, it's a standard electromechanical relay available from Mouser for $14 and is probably the best device to use.
Lefty