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Saturated steam (which is what heating boilers produce) is not "wet". It just means there's no superheat.

Wet means droplets. (Got this drummed into my head by a powerplant turbine guy- where you REALLY don't want droplets)

😂I think you might have changed the question there! Sorry I forgot to vote, I would have selected 4, but with the caveat that not all wet steam is the same. The chart shows the power of steam heat is in the latent heat portion of the steam and you’re right that it’s hard to measure. But very wet steam carries a fraction of the heat transfer capability of ‘dry’ steam.

It is very important that we use proper terminology when talking about technical issues. I have to look into my notes to verify this. When I got into steam heating 3 years ago I had a presentation that I would give to land lords and property managers. I wrote "wet steam is a condition in which 2% or more of the steam contains water droplets". Water is weighs much more than steams so I assume it is by volume. So no one gets confused, Steam is gas just like air, water droplets can float in air but will eventually come down due to gravity as with aerosol hair spray or an atomizer in an oil burner. These droplets can be small but they are not steam and do not have the same heat content as steam.

By loud I mean hammering. I wouldn't know if my system's whooshing more than others.