The upstairs loop of my hotwate 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).
- posted
17 years ago