cheap pump, small flow rate , frequent start stop quite annoying.

if Rm400 for installation only= expensive,

additional piping for the pump installation or @ other area?

RM400 installation is expensive? I tot Zean also mentioned it's around that price?

I also got RM400 water pump installation with direct water bypass after I show my plumber the installation diagram I got from Zean. Before this he quoted me RM300.

These pumps are cheap and durable. But as it is the continueous on/off of the pump is too noisy to have it in the house. When it cannot be installed in the house due to the noise you cannot have it on the roof but outside the house. That means the pressure from ground to the roof is lost especially so it it is double storey.

Unlike Grundfos pump you can install on the roof/celing. The pressure from top to the bathroom is not lost but even stronger as it comes down with gravity assist. When pumps are installed at ground it loses its head/pressure due to height/gravity.

When choosing a pump, you have to know what you want it for? What is the objective, what you want to achieve? You got semi-d 2 storey you should go for high range pump, not because cheap pumps are not good, because you can afford for luxury. Drive expensive car with re-treaded tires?

The plumbling charge is reasonably cheap for double story semi-d.

You can get Hitachi water pump in Klang too, so far the nearest I got is few hardware shops around Econsave Jalan Kebun, Klang.

The installation diagram of Grundfos water pump with water bypass. You can get the same as well in Hitachi water pump brochure.