Hi all,
I am currently in the midst of my bathroom replacement and I have come across a problem that I hope you can help me with.
I have installed a new Grundfos Amazon STP-2.0 B regenerative pump. I have a traditional gravity fed system. I have tested the system before I close up and all is working corrrectly and I have no leaks. However when I use hot water from any other taps in the house (not fed by the pump) the pump pulses on and off until the tap is turned off.
Things to note is that I have Tee'd off the hot water supply at the first downward leg from the cylinder. I understood from my research prior to installing the pump that this would be ok aslong as a regerative pump is used, due to being less susceptible to air in the system, hence I have not installed a surrey flange. This would be more difficult and I'd rather leave the connections to the tank alone as its quite an old tank.
I have read that others that have had this problem have installed a non-return valve on the outlet side of the pump. This is also suggested as a solution in the Grundfos manual. Have others come across this problem and has it been resolved via a non-return valve or is a surrey flange really the only way?
Regards,
Chris
I am currently in the midst of my bathroom replacement and I have come across a problem that I hope you can help me with.
I have installed a new Grundfos Amazon STP-2.0 B regenerative pump. I have a traditional gravity fed system. I have tested the system before I close up and all is working corrrectly and I have no leaks. However when I use hot water from any other taps in the house (not fed by the pump) the pump pulses on and off until the tap is turned off.
Things to note is that I have Tee'd off the hot water supply at the first downward leg from the cylinder. I understood from my research prior to installing the pump that this would be ok aslong as a regerative pump is used, due to being less susceptible to air in the system, hence I have not installed a surrey flange. This would be more difficult and I'd rather leave the connections to the tank alone as its quite an old tank.
I have read that others that have had this problem have installed a non-return valve on the outlet side of the pump. This is also suggested as a solution in the Grundfos manual. Have others come across this problem and has it been resolved via a non-return valve or is a surrey flange really the only way?
Regards,
Chris