The pressure a boiler can take in a coffee machine is finite
Lets face it they dont use 10mm thick metal
However the boiler size does have a bearing on steam availability as theres plenty of steam to go around
You can decrease the pressure by not turning the steam knob to much It works like a tap

In reality steaming milk is not that hard with a commercial machine
I think you just need practice to get used to it
KK

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