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My opinion of NEST on steam
So I decided to buy a Nest last night and give it a whirl on my steam system. Currently using a VisionPro 8000 series set to 2 CPH.
The Nest has already been returned as right off the bat after updating it locked up once. After that it complained my wiring (2 wires) had no continuity to one wire and yet the other wire was good. How that could ever be possible is beyond me not to mention it did control the boiler. I am running a new line to get a common at the stat but that is moot at this point.
The lock up combined with complaining about a missing wire and the overall feel of the Nest was enough to make me return it. It seemed slow to respond to temperature change, I hated the fact you had to wave your hand an inch from the screen to get it to display anything. The huge number it displays is the set point and the current room temp is tiny which also annoys me. I want more information not less!
So, my hunt for a thermostat that works like my VP 8000 but will give me data logging and more control continues possibly to never be fulfilled. The Honeywell 9000 series doesn't offer data logging so seems like a waste of time and money.
Today I will be running the new line so the VP 8000 will stay lit all of the time. I like to see what the system is doing when I walk by.
Although I did not use it near long enough to allow it to learn anything it seemed to allow way too wide of a temperature change to me. My VP 8000 set to 2 CPH will maintain less than a 1 degree temperature swing. The Nest was doing a 3 degree swing. Perhaps this would have improved over time I cannot say.
Single pipe quasi-vapor system.
Typical operating pressure 0.14 - 0.43 oz measured with Magnehelic. High pressure limit set to 1oz. Weil-McLain EG-40 rated for 325sqft intentionally connected to 392sqft of radiation via two 2" risers into a 3" drop header and 2" equalizer. ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
Steam system pictures updated 1/25/15.https://picasaweb.google.com/thetube0a3/Boiler?authkey=Gv1sRgCImUxIqv9436MQ#