How can anybody in a forum without seeing/testing your pipes tell you if it is true or not?

It is something that might happen. If so, then ask developer to clear the air. Or just read up on the Internet, just google for the info.

I noticed the UNI-E models also have a pressure tank. If we don't want this maintenance issue (pump air once a year) but yet want the VSD feature, can we order UNI-E without the tank?

For your size of house, 1 to 1.5 HP is sufficient. This is quite a standard power.

Since yours is a new house, there should be no problem with pipes bursting. The pipes are normally rated to withstand 10-15 bar pressure. Your pump is only putting out 3-4 bar.

The problem usually occurs with old houses where the pipes and the joints (especially) are more worn. Installing a pump then may cause the weak areas to leak.

This post has been edited by jchong: Nov 21 2016, 12:31 PM

Can you explain how those switches/relays help to prevent over pressure?

I thought to reduce over pressure, you need pump with inverter or variable speed drive.

Looking on the bright side, the pump is acting as a leak detector. Helps alert you if there is any leak in the faucet or pipes.

I've read there are some pumps that can be controlled by flow rate, i.e. once a certain flow qty is required then only pump turns on. Therefore, minor leaks will not cause the pump to turn on.

I see your meaning for relay now. Yeah, the wiring is gonna be more difficult. Gotta hack the wall if you want to conceal it. I think most house owners won't choose to do this.

Tapping to bathroom light or heater also means you need to turn on the light or heater every time you shower, which isn't always necessary.

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.