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Desirable technical characteristics of thermostats for one-pipe steam ?

KMSNYC Member Posts: 31
I want to change to a new thermostat. Aside from nice modern characteristics one might (or not) want like WIFI, remote sensor(s), and the normal specs one would need to choose by (two or three wire, low or line voltage programable or not etc.) what are the main technical characteristics that make a thermostat good for steam?
Two possible ones:
- Cycles per hour (this was pointed out to me by someone recently): how many times the boiler is allowed to cycle per hour. For steam that is said to be fewer than for other types of systems because steam systems take time to heat up but also take time to cool off..as opposed to say, a hot air system that produces heat almost immediately and stops producing heat the instant the boiler shuts off.
- differential - if this can be programmed - the difference between when the thermostat switches the heat device on and the set point or target temp- does this matter ? Eg., set point is 70 deg; but thermostat won't switch boiler on until room temp is 67; differential is 3 degrees. Does this matter ?