High efficiency boiler?

[Montana2424]

We have an NTI high efficiency boiler we use for radiant floor heat. Is it more efficient/better to set the boiler at 120 degrees to warm the house for a longer period of time OR is it better to set it at 150 degrees for shorter period of time?

 

[JG plumbing]

The longer the boiler runs the more effeciant. You want it to run as low as possible for a long as possible.