I'm looking at purchasing a steam generator from 1 of 2 manufacturers and one side says theirs is better because it does not modulate and the other says it is better because it does modulate.Thank you for any help.
I had been a boiler operator for 30 years never heard a word modulation in connection with boilers. For signals like radio they use word modulation.
by modulation I expect they mean variable firing rate. Some boilers work on a low a high fire rate. The low is set to just below the minimum steam requirements when the pressure drops slightly the burner swings to high fire until the pressure recovers. A modulating burner continuously adjusts its flame to match the steam demand. A modulating boiler is better if you have a fairly steady steam demand but has trouble keeping up with widely varying loads.
I think they are talking about the boiler adjusting it steam production to match demand. I have never seen a boiler the could not modulate to match demand. I suggest you talk with the boiler supplier to see what they mean by modulation.
