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Hi. We just had a new 210 BTU Burnham steam boiler installed in our home. Our plumber installed one 2.5″ riser coming out of the top of the boiler, which is the way our old boiler was set up. Seems to be working okay. However, I was looking through the instruction manual and noticed that the manufacturer actually specifies two risers, each at least 2″ (the second riser is optional only for models smaller than ours). Now I’m getting worried. Can anyone tell me whether this is a big deal, or just standard practice? Are there implications in terms of safety, efficiency, etc.? Would you call the plumber back and demand to have the second riser added? Thanks in advance!