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Programmable thermostat with old cast iron radiators
This is my first winter in a home with a hot water boiler and I'm trying to get it to operate as efficiently as possible. I've been looking around this site and noticed that people mention setting a minimum temp on their boiler. Is this only with combination boilers that are also used for potable water? I have a separate water heater and my boiler always cools to room temp after turning off. Also, I was given a Honeywell TH4110D1007 PRO 4000 that I installed a couple days ago. I'm upgrading from a digital non-programmable thermostat. My home was built in 1925, is about 1800 sq ft finished, and I have 9 large cast iron radiators with an older 80's Burnham hot water boiler. With the old thermostat I set the temp differential from .5 to 2. I didn't really mind the temperature swing and thought this would be the most efficient. The new Honeywell thermostat uses CHP. Honeywell recommends 3, but I've set it to 1, thinking this would be more efficient, cause less wear on the boiler, and I don't mind the temp varying a little in the house. Am I correct that this is more efficient? Would turning off adaptive intelligent recovery help with efficiency also, or just cause the boiler to overshoot?
I'm happy to provide additional details needed. Thank you for any input.