dont really understand, built in heater = storage heater or instant heater?

I visited his bathroom, toilet, washroom. Switch on the pump. Notice no visible storage heater or any heater mode. Just a water switch (Hot and cold) on water tap controller . Purposely switch to hot and water became hot. What method he use ? Asked him and he said pump build it blah2.

then he is using either storage heeater or solar heater

there is a new inverter model which can adjust the pressure according to usage? what the model no?

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

Hi zheilwane, my house is a DS link with 3 bathrooms and one rain shower, which model of pump do you recommend for my house? My area has very bad water pressure so much so i have to use heaters with built in pump else the water pressure is a good as useless. I am looking to fix this pump to improve the water pressure for my entire house.

Grundfos CM3-4PM1 is sufficient, if wan more power CM3-5PM1 price difference ard RM 50+ only.

Our shop will be closed this mon - wed

Hi All,

Any review on the Grundfos Scala2?

Was planning to install water pump in 3 bathroom house...

Thanks

Got your review?

Not really from end user pal. From seller yes and stated it is variable pressure. Which mean after certain pressure is set, it will keeping up the pressure when u turn on the water and up to 4 bathroom. It is quite silent as well as easy to install.

Scala 2 is a new model in malaysia, hence wont have much review on it. However, grundfos is popular for low noise, high pressure and durability for CH series which later then replaced with CM series (current model) while Scala2 is a completely new design.

With all the new added features, the scala2 price is quite close to CM series. Then people start to ask, why new model so cheap? Answer is MATERIAL used.

So which model to choose?
If u need all the new features like variable speed, outdoor installation, etc etc then scala2

If you wan something that is proven to be good, durable and also has been used many years in malaysia then CM series such as CM3-5PM1

Want to know more details, i can point out and compare when u r in my shop

This post has been edited by zheilwane: May 29 2017, 09:42 PM

hi guys i hv a ch2-50
friend gave me a used one but working

today my plumber installed it and he tested ok working

but then after work evening i went my house to tewt, no matter on or off the pump switch also no sound
and pressure weak, no different

he say maybe my pump spoil

tmr hes coming to check

wat do u guys recon?

Sounds like a pump that suited for pushing water up based on "Head max". If there's no alternative step down / de-rated / reduced power setting then better change to another.

Looks like a multi stage series based on the pdf.

This post has been edited by halcyon27: Jun 22 2017, 08:04 PM

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

get Grundfos scala 2 then, since it is variable speed and adjustable pressure

FYI, is not the pump too strong, if leak at the joint = wasnt installed properly with the right glue. If burst out from the pipe = the pipe is lousy or too thin

Most pipes (even ABS) should be able to withstand pressure up to 10 bar or beyond. Water pump only pressurizes up to around 3 bar.

Usually if the pipe leaks, it's likely a workmanship issue - especially near the joints. Maybe the plumber didn't joint properly.

Another reason could be slight settlement of the house causing stress on the pipes and making it crack.

I think most pumps have a "head" rating. Doesn't mean that the pump is specially designed to push water up only.

I'm quite sure the CH4-40 is also classified as a normal domestic water pump.

Hi zheilwane,
I have been using a CH2-50 Grundfos pump and looking for a replacement. Have been using it for almost 10 years. Can you please recommend an equivalent model or a more suitable model for this based on the current models available from Grundfos. I have 4 bathrooms that use this pump (although mostly not at the same time) and my plummer commended that its a bit too strong. Please advise. Thank you.

Grundfos CM3-5PM1 this is the replacement for CH2-50PC