In article om,
Chuck D wrote:
The upstairs loop of my ho****e system is getting warm even though the
pump has not run for many hours. Seems like some sort of convection flow.
The thermostat controls the pump for the loop. (Tacopump about 30 years
old Weil boiler same age)
The basement loop (where the boiler is located) has it's own pump and
thermostat and does not show temp
when the pump is off. The boiler is off from late spring to fall and there
are no signs of water around it. Could the pump be so worn that water is
able to leak by the impeller and set up a convection Flow? The pump is in
the return line ( factory mounted position).

The type of pump used in a hot water heating system doesn't keep water
from flowing when it is not running, whether it is worn or brand new.
--
No dumb questions, just dumb answers.

Larry Wasserman - Baltimore, Maryland -