Well I don't "need" any of this. I was getting along with cheapo Hakko, TS100, and a 230V noname.
Amateur radio stuff is cables, filters, and I wanted to try amplifiers. It involves big planes, big coils, big cables for big power, and usually by the time solder flows nicely, the dielectric on the cable starts melting. Or it takes forever to heat up and unsolder a toroid inductor from a PCB. I thought a more powerfull iron with could do a better job. It's quite possible T245 works good enough, I Don't know.
Just saying that T245 is enough for most people. It will be drastically better than the TS100 for sure, and worth it either way.
For the unsoldering toroid from PCB example, the limitation you'd probably see is thermal transfer ability which is based on surface area, etc. So lets say your tip is contacting a 2x2mm area (and its not some monster industrial toroid), it might only take 50W, and 500W or 1000W capacity with a 10mm diameter tip is not going to help you.
If that 50W is not enough then we have to preheat the board, eg infrared or hot air.
I've searched all day for Aixun T435 and I2C PDK1200R. I think those are about 500€ if I can even get them. i can't understand where to buy them (I'm in Germany currently) and for that price I might as well search second hand JBC original, I think.
Aliexpress but from another thread it sounds like they don't ship to Germany in many cases.
I'm little lost with compatibility. Almost no one even uses C470? I think JBC says T470 can accept C470 and C245 but T245 can only accept C245?
All of chinese manufacturers are much more vague even if they mantion C470 it looks very casual and might not even be true.
C245 is the tip shape, T245 is the handpiece itself. T245 only works with C245, T470 with C470, etc. yes. But we often use them interchangeably just to describe the range.
Correct, very few people actually use T470 tips/handles.