Unless you have frequent disruption, if not doing auto things will complicate and cause more problem. A manual by pass is much better, or just have a big azz tank up the roof.

One way valve some day will have problem though you have not experience. the rubber rot, expanded and the spring also. Besides for those with low water pressure from main it somehow reduces the flow and pressure as the water has to push thru the valve/spring to open it. Also, when sands/debris get stuck there the reverse can happen.

i have to change my solar heater's one way valve once every 3 yrs under the hot sun when it leaks or get stucked.Just dont know where the sands/dirt come from and the rubber and spring not working.

no filter ? lol hahahaha

I am using the Grundfos PC model, without the accumulator tank. The pump is sure vv powerful to 4 Bath. Just want to ask. How do I reduce the water hamering when the pump cut in/out. worried if the ABS piping leak. Can I install the accumulator tank (From PT) on my PC model pump to reduce the intial pressure? Too frequent pump on/off, even if I open the tap. Hope you can advise me how to modify if can help to reduce the sudden pressure surge.

Yes you can modify and add a tank, saw ppl doing that but if u modify it, the warranty might void. If ur pipe can last 1 week without problem, it should give u any problem in the future.

Adding a tank from pt model won't reduce the pressue but it definitely reduce the motor frequently start stop.

The hammering occur normally due to your piping not secure/fix, the abs pipe vibrate when the pump start, stop. Try add more bracket to hold the pipes ...


Nothing will affect the warranty as the tank can be install away from the pump, just modify the out going main pipe after the pump with tee and add a stopcock before connect to the tank.

This post has been edited by skng03: Mar 15 2012, 11:53 AM

Thatz y i say MIGHT n not WILL. It all depends on how u install the tank, there are ppl who installed it right above the PC which will damage the PC as the tank is heavy. If u install it away from the pump then it is OK. With the tank, water hammering could b reduced as the TANK will absorb back some of the impact.

For better performance, you can get Grundfos UNI E model which comes with variable speed, slow start and slow stop, reduce water hammering and protect ur pipes.

I thought the additional tank is to be connected after the pump and not from main pipe???

I am using water pump. Many people warm me of hammering sound, and Zzzzzing sound when pump is running. When the pump is running I will only notice the Zzzzzing sound if I am on the first floor living hall, the pump is around that area, is just like sound of a normal ceiling Fan at low speed. Did not notice hammering too.

Please secure your piping after the pump. My contractor used lots of wood, securing on the roof truss, than secure the pipe very long way.

My house using PC, no water hammering noise at all. Whether u hear the noise or not, depends on the quality of the piping work.

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Added on March 15, 2012, 11:44 amHowever, using the right pump could reduce the hammering

This post has been edited by zheilwane: Mar 15 2012, 11:44 AM

yup, my statement a bit confusing...


The additional tank shall connect to the out going main pipe after the pump, NOT the supply main

anyway, i edited my last post

The PT model allows us to adjust the pressure. I set its stop higher so that I got continuous high pressure. Just make sure that the airtank got enough air pressure otherwise you get sudden hot and sudden cold water flowing from your shower heads.

Thanks guys for the positive feedback. A UNI E would be more suitable, but my PC pump is only 3 months old. Rather than spending more on a new pump, I would like improve the system by adding in the accumulator tank on the pump discharge line. On the tank it is stated 1.9 bar air. Does anyone know what is the pump press?

Did u buy Grundfos's Tank? or another brand?

the groundfos tank .. every year or so need to service right ? is there a tank that no need service..? eg self contained ?

The service is to refill the air pressure like car tire pressure it will lose air pressure. You shouild do it yourself like tires are you going to ask mechanic to do it for you? Only once a yr ma. Use a manual pump/bycicle pump. just shut the incoming main to the pump and let go the water from your bathroom and empty it where the pipe from the pump to the outlets pressure is zero then you pump the tank to the desire pressure by using a tire pressure guage buy from car accesories shop.

Actually, same here too, I m using Grundfos PC model, and it is causing my pipes to hammer. I m still looking for ways to mitigate it, as i don't want to have leaking pipes later.
The only problem in my situation is that my pump is very difficult to reach, there is no manhole to reach it, and the only way is to go via the roof. Since the tank needs refilling every year, I've decided to go for a maintenance free pump, the PC model but unfortunately comes with hammering consequences.
Anyone have any ideas on how to help on the hammering effect?

Buy a mini compressor

oh that simple only ah.. i thought how to refill dont know what.. hehehhe

got any video on how to service these tanks ? inside the grundfos tank the Diafram is made out of what ?

I read a forum (UK)about accumulator. Someone suggest to extend the air filling nozzle to acccesible level or relocte the tank to lower level since the Hidraulic pressue in the line is same at all point - for easy maintenance. Only problem is I can find the connection for the air nozzle. Info- Just checked the pump pressure rating is 6-10 bar for CH-50PC model. Maybe Zhielwane can help source for the nozzle?