Quote Originally Posted by adamfilip View Post
I ordered the relay and heatsink. looking forward to trying this out. how likely is the relay to fail if using a heatsink?

Not sure but I wouldn't want to find out. If the relay fails there is a chance that it would stick in the on position and since it is wired directly to your power supply your bed temp would run away. Not that this is any different than the mechanical relay because it would do the same thing if the contacts stuck on with the relay.