Posted by Harold Kestenholz - Hydronic Network on September 15, 2001 at 06:34:01:
In Reply to: Relay doesn't always trigger posted by Mike on September 15, 2001 at 03:26:46:
: We've just started renting a property, and the boiler is very temperamental. It always works, but
You seem to be describing a boiler that makes water inside the boiler with a tankless coil. A coil that has become restricted due to hardness in the water will require a high pressure drop and will be less sensitive to control. A heating plumber can check the coil and the hot water control settings. The hot water control settings may be too low and the range too wide.