My house was a bungalow that was extended up into the roof, and a bathroom installed up there. The hot water cylinder remains on the ground floor. The mains water pressure is low. A Stuart Monsoon U3 dual pump was installed to pump both hot and cold.
I am thinking that this is the wrong type of pump for this as it pumps both supplies at once, regardless of which one is called?
Some years ago I had a similar pump fail and when I stripped it down found that one of the woodruff keys that holds the impeller to the motor shaft had sheared off. My assumption was that as it was trying to pump against a closed pipe for the supply that hadn't been called for and this caused the failure.
Am I right in my logic of how this works? If, for instance, I run only the hot tap upstairs then the pump is trying to also pump cold up there but with the cold taps closed (and toilet cistern full) it has nowhere to go?
Reason this has come up is because the pump has started making a squealing noise that sounds like impeller slipping or rubbing (from one end of the pump only).
Surely two separate pumps should have been installed?
I am thinking that this is the wrong type of pump for this as it pumps both supplies at once, regardless of which one is called?
Some years ago I had a similar pump fail and when I stripped it down found that one of the woodruff keys that holds the impeller to the motor shaft had sheared off. My assumption was that as it was trying to pump against a closed pipe for the supply that hadn't been called for and this caused the failure.
Am I right in my logic of how this works? If, for instance, I run only the hot tap upstairs then the pump is trying to also pump cold up there but with the cold taps closed (and toilet cistern full) it has nowhere to go?
Reason this has come up is because the pump has started making a squealing noise that sounds like impeller slipping or rubbing (from one end of the pump only).
Surely two separate pumps should have been installed?