How hot are they ?

I currently operate an EL34 tube integrated amp with two power tubes per channel . I find the heat output acceptable .
I would like to investigate the world of SET integrated amps
and would like to know about the heat output of the various SET DHT tubes as compared to my present set up . In question are 300b , 211 & 845 tubes . I am guessing that there would only be one power tube per channel with this style of amp .
Can anyone speak to this situation ?

Thank You