unclesyd, it is the same as a big boiler at the same pressure.
electric resistance element steam boilers/steam generators are common
at any pressure, it is expensive to build because takes the same controls as a large steam. generator.
for gas/fuel steamers, the same process, can be built as water tube.
We take orders form 2pph steam generators at 2500psi of course we give the customer 10 pph min. instead as it cost us the same and we feel bad to get paid for so little steam. current order of 2pph at 500psi. pc of cake.