I have a 1950's era hot water boiler using the baseboard style radiator. There is only one zone in the entire home. I would like to switch to a programmable style thermostat to better manage the heating in the house. Is there a way I can switch to a 24 volt thermostat using a relay or switch? From what I can tell, the thermostat turns on the pump only. The way I can tell is the pump will still run after the boiler turns off and not turning off until the thermostat says to do so. The heating system, other than a poor thermostat, runs great and cools the home very evenly. Your help will be very much appreciated.



CHAD

Can you explain why you need to swicth to 24 v from line voltage just to get a programmable stat? They do come in both 24 volt and line voltage. Look at the 5th one down this list LUX Programmable and Non Programmable low and line Voltage Thermostats

I found a 110/240 volt thermostat and installed it. It ran fine for a couple of hours but in the middle of the night I woke up to a clicking sound. The thermostat was cycling on and off at the pump. Any ideas why? I thought the problem might be because the thermostat that was installed stated it was for electric heat. Also I have not found many programmable thermostats and thought it might be easier to go to a 24 volt system.

I think you may have installed the wrong programmable line voltage stat. I have not done one for quite awhile but stats for electric heater are often not for a boiler. If you can tell me your brand and model I could tell better.

The thermostat I had was a Honeywell RLV 430. On the package it states to use for electric baseboards, convectors, and Radiant ceilings. Like I said before, with this thermostat the pump turned on and off. I did order that thermostat you said would work. I thought I could give it a try.

Yep, you better have saved the box because that guy needs to go back. The fifth one down on my earlier post is also not for you. Keep searching the net for a line voltage not for a baseboard.