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Some gases can get extremely cold when flowing , the Joules-Thomson effect. This is a common welding problem on Carbon Dioxide and Argon mixes when a high flow situation can cause freezing of the regulator. The regulator then flows less and freezes more until is stops flowing. DO NOT pour boiling / hot water on a regulator EVER. The solution for this problem is to introduce heat by way of a purpose designed gas heater.

These are available in a variety of sizes and capacities, configured to your system. On many occasions, because the pattern of usage can vary so much and balance of peak flow to average flow can be many multiples, it can take some trial and error to find the optimum solution.