I just think the structure of a single heat exchanger is a little different from that in reality. It’s possible to use small heat exchangers to heat boilers and thermal machines, but you won’t want to use a bunch of small heat exchangers to provide heat for large boilers. Not only does this seem to be very inefficient (because boilers only accept heat at the bottom), but you also need to consume a lot of Lava can make this “geothermal boiler” output steam. So I think of the large GT5U heat exchanger, which is obviously more efficient than the small heat exchanger + boiler, and more similar to the real heat exchanger.
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