What do I need to control the immersion temperature?
Can I just use the normal thermostat or or I need a PID?
I'm gonna use a copper cylinder which will the immersion pointing up from the bottom, will a 11" be sufficient?
Would a 50lpm pump be powerful enough?
And do I need an educator?
You can use either to control temperature, but in my humble opinion it's a no contest in favour of a PID and SSR setup. Way more accurate control over temperature and it will control to higher temperatures than the standard immersion thermostat. Some PIDs have a high temp alarm which can be a used as a high temperature shut sown.
11 inch immersion elements are usually bent double, however it's the wattage which dictates how well it will perform. Most standard immersions are 3Kw, but defiantly stick with the 11 inch version for safety.
I have a 40lpm Leo pump on my processor, but I run it in parallel with a little Mono MS (when it's not leaking) but I recon the system would benefit from a still higher flow rate. My venturi although sized for a 40 lpm pump works far better driven by a higher flow. So I'd say go for a 60-80 lpm pump if you can stretch to it.
I've not got an eductor, so can't comment, but a bigger pump will go a long way to doing the same thing.
