Originally Posted by petrostar
Kingfish, Perfect. I have a few ssr around. I'll order tonight. How accurate has it been for you? I'll be using it with a herms setup.
I have two of those in the control panel for my HERMS, and I've been happy with them. The SS probes are actually pretty nice and respond to temp changes very quickly. The cables for the probes are pretty short, but it's easy enough to extend them. Mine came accurately calibrated, but they also have a calibration feature in the menu.
If you're doing a gas fired HERMS, you won't need any SSR's, since the relay built into the controller will be more than sufficient. If you're going electric you'll need SSR's, but IMO a PID might be a better option for about the same price. A PID will give you a lot more options and flexibility than a simple on/off controller like these.