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Thermostat CPH setting: The Goldilocks question
I find that especially with this recent subzero cold, a 1 CPH (cycle per hour) thermostat setting causes a lot of temperature fluctuation and maxes out the radiators each cycle (i.e. they get really really hot).
As an experiment I changed the setting to 3 CPH (the next higher option), and this has evened out the room temp fluctuation considerably, and results in less extreme radiator temps. With 3 CPH, I measure on average 23-26 minutes of down time between cycles, and 6-8 minutes of firing (making steam after ~2 minutes) per cycle.
But as some of the radiators never really cool down between cycles, I'm wondering if 2 CPH would be optimal. Anybody know an inexpensive T'stat that provides this option? Any other comments on what I'm trying to accomplish? This is a single family home with a 1929 Webster 2-pipe steam system (new-ish gas fired boiler), in-wall convectors downstairs & (non-covered) radiators upstairs. The house is as well-insulated as it's going to be, and the windows/storms are decently tight.
Happy new year all,