That's a fantastic device. I was not aware that such a boiler control existed.

My only problem with using it is that I have to maintain a floor temperature of 150°F. for domestic hot water. This negates some of the benefit of full regulation by such a control. Most of the year (excluding January and February), the control simply maintains 150°F. I need to raise it if we hit a cold spell when the ambients drop below 20°F. and remain there.

If I had any greater demand for hot water and installed a separate hot water heater, this device would be perfect.

Thanks for the link. I'll be keeping it in mind for the future. I've got to believe that Honeywell also makes a similar unit??