Hi

my friend's house has a Grundfos CH4-40 water pump. when on, the wall vibrate (due to water piper in the wall)....

i think the pressure too strong. suggest that he downgrade the water pump. already he had a >4 cases of burst water pipes (ABS pipe - blue colour - does not help also).

=> Can anyone suggest a weaker pump or any other way to reduce the pressure ?

thank you thank you

CH4 - 40
Specifications

Product name CH 4-40 A-W-A-CVBE
Product No 44501104
EAN number 5708601045899
Price On request
Technical
Rated flow 5 m³/h
Rated head 20.8 m
Head max 34 m
Primary shaft seal CVBE
Pump version A
Model H
Materials
Pump housing Cast iron
Pump housing EN-JL1030
Pump housing ASTM 30 B
Impeller Stainless steel
Impeller DIN W.-Nr. 1.4301
Impeller AISI 304
Material code A
Installation
Range of ambient temperature 0 .. 55 °C
Max pressure at stated temp 6 bar / 90 °C
Max pressure at stated temp 10 bar / 40 °C
Connect code W
Pump inlet Rp 1 1/4
Pump outlet Rp 1
Liquid
Pumped liquid Water
Liquid temperature range 0 .. 90 °C
Q_OpFluidTemp 20 °C
Density 998.2 kg/m³
Electrical data
Motor type MG71
Power input - P1 965 W
P2 660 W
Mains frequency 50 Hz
Rated voltage 3 x 220-240D/380-415Y V
Rated current 2,8/1,6 A
Maximum current consumption 2,8/1,6 A
Enclosure class (IEC 34-5) IP54
Insulation class (IEC 85) F
Motor protec NONE
Thermal protec external

Thanks halcyon27 for your feedback. I missed the head...onviously you are absolutely spot-on with the observation.