Reddit reviews Camco 02102/02103 1000W 120V Screw-In Water Heater Element - High Watt Density

It's impossible to say without knowing what model crock pot you have. You can usually find the voltage by looking at it. There should be some kind of label or sticker on the bottom. Most likely, if you're living in a country that's 110V, it most likely is 110V. If you don't know, I would assume it's 120V to be on the safe side unless you live in another country that has the 220v-240v standard.. then assume it uses the higher number.

With that said, to safely do this, you also need to figure out the wattage of the heater element and the amperage rating of the relay. PIDs itself usually only support 3 Amps. With only that, you can only safely switch a 360 watts heating element. Most DIY PID controllers wire a separate SSR that's rated at either 10A or 15A to allow the use of more powerful heaters. Check the numbers first before you start wiring.

To be honest, I wouldn't mess with the nice programmable crock pot. It's such a waste to do so. Crock pots are a poor choice to connect to a temp controller anyways. They are slow to heat up because the ceramic bowl will absorb a lot of the energy before the water heats up. Then when the water reaches the desired temperature and the PID shuts the crock pot off, the water temperature still rises because the ceramic bowl is still heating it up.

You'll be better off using a dumb rice cooker, a coffee urn, or even a water heater element.

http://www.amazon.com/Camco-02103-Screw-In-Heater-Element/dp/B0006IX8AA/

Connect this to an AC cord and just plug that into the PID. You can use any container as long as you properly submerge the heater element to the correct dept.

Ah. Yup, that'd certainly do it. Just another reason to go with bucket heaters or 120v water heater elements.