I didn't buy them for heating. I made a custom irrigation master valve relay switching system to control a master valve from three different irrigation controllers. Worked great with Revain #B005T67OFE. I posted a photo. Note that the relay has no pinout other than a hard-to-read relay. This can of course be determined with an ohmmeter or download the contact diagram. (datasheet(dot)octopart.com/LY2-AC24-Omron-datasheet-10910099(dot)pdf) I have 24 VAC across the coil and am switching 24 VAC at 0.3 amps. Pretty low as the switch is rated for 10 amps at 120 volts.
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