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Another thermostat question for one pipe steam system

Dima Member Posts: 3
Hi All.

This probably will be the millions thermostat question on

this board but I need some help selecting a new thermostat and specifically the

right CPH setting.

 I have a two family house (two floors) with a one pipe steam

system. However, instead of cast iron radiators, the system has iron/steel

(black pipe) find tube convectors.  I

want to replace the old original Honeywell round thermostat with a digital one.

Almost all of the threads I read here recommend getting a Honeywell Vision pro

series thermostat with adjustable CPH and set it to one cycle per hour. This

setting would probably do well with cast iron radiators, but I am concerned it

might not work well with convectors since they get hot and cold at much faster


Could anyone please advise on a  correct CPH setting

for my system?

Any advice is appreciated.

PS.  I read somewhere

( I think on this forum) that select White Rogers thermostats have an option to

select the type of radiators in the system but I can’t seem to find a model

that does it. Did anyone hear about such a feature on their thermostats?

Thank you.


  • JStar
    JStar Member Posts: 2,752

    1, 2, ?

    The vision pro allows any number of CPH up to at least 9. Start at 1. If it doesn't work, try 2. It's less scientific than you think.
This discussion has been closed.