I'm getting a new house and looking at another mini renovation.

In my previous house I've renovated, the water tank and the water pump (Grundfos) is placed on the roof.

This time around, after looking at how other countries have implemented water tank and water pump eg Thailand, I wanted to move the water tank and water pump to the ground floor just after the main water inlet.  Wanted to know if this is feasible

The way I look at it, with the water tank at the roof, I will never ever clean the tank due to safety reason and the heat. Also maintenance will be difficult for the water pump, although I've never has any issue with it.

Nevertheless, if I were to go ahead with my plan, what are the drawback. One contractor was telling me, the water pump will be working more as the water need to pump upwards before it gets distributed to the entire house.

hi all

need advise on the water piping connection for my house. the black line is originally from main source to the house. i then added water filter and water pump to use the water from water tank. blue colour is the newly added and installed by the plumber.

problems i face:-

1. after using the water pump which pump out the water from the tank into the house i somehow feel the water pressure is not as good as the original direct source. water pump capacity not good enough? now running water pump, so valve 01 is close all the while.

2.  plumber told me when i want to backflush the water filter, i need to off pump, closed valve 02 & valve 04 and open valve 01.    this is to use direct water source. he says if i didnt do this the pressure from water pump might damage the water filter

3. when there is power outage, i need to do the same for above to run direct water source. because no power, the pump not running there will be no water in the house unless switch to direct water source.

i somehow feels that this is not very convenient as u need to turn this on and off here and there. is this common for all water pump users?

there is one time at night raining heavily and suddenly power outage. i have to use umbrella go outside of house to turn all the valve to switch to direct line in order to use water inside the house 

anyone can advise or any modifications to be done?

wow. thanks for the helpful advise. 

1. & 2. - if install checkvalve do i still need to have the valve 01? or can remove/replace with the checkvalve?

3. sorry what does it means do u mean by "bypass" for the filter, tank and pump. is it another piping system?

4. ok will check on the pump model and spec

oh. now i know what is bypass 

if i were to make a bypass line for the filter, tank and pump, the valve will be for both the line and bypass line? or the valve on the equipment itself is sufficient.

oh. now i know what is bypass 

if i were to make a bypass line for the filter, tank and pump, the valve will be for both the line and bypass line? or the valve on the equipment itself is sufficient.

something went up my mind.

my previous connection is either 2 way:
1. main water to house (without pump)
2. using water from tank (with pump function)

from ur proposal above, both line are running. so meaning every water usage is pressure from the pump? correct me if im wrong?

have a look at the drawing.

normal daily operation is all valve open, water pump on. (except bypass line)

if no power, pump will not works, there will still water from main source into the house.
if washing filter, backflush, there will be no pressure from water pump to water filter because have check valve.

red colour line is the bypass line for water filter. if water filter damage/repair V-F1 & 2 close. V-BP1 & 2 open. normal operation V-BP1 & 2 will be close.

if water tank need repair/maintenance, V-02 & V-03 close. still will have water from main source. valve 04 need close? need install check valve here? water will go to pump?

if water pump need repair/maintenance, V-04 & V-03 close. water from main source will still go to tank. and also go to house.

is this correct? hmm.gif

another thing that still makes me wondering is on the daily operation water usage. the water will be both from water tank and also main source right? then what pressure am i getting? the pressure from the water pump or the pressure from the main source? and everytime water used in the house pump will operate right?

Simultaneous flow creates a pressure build up along the pipes where there two flows will meet usually at the junction.

Check valves prevent contra (opposite) flow. On a cold inlet of a hot water storage heater it prevents the heater from running dry due to siphoning. In a solar heater in the roof, it prevents hot water being siphoned from its inlet into the cold water line to the end point when pump operates which can be disastrous if the cold pipe is not rated to withstand high temperature.

In all cases I've seen, check valves are located after pump but more importantly it's located at a hot water heater or solar water heater cold inlet.

Hi there,

I’ll just intro lil bit about my situation.
House : Semi D Double Storey
Toilet : 3
User : 2
Water flow : direct pipe to kitchen and water tank to other pipes example bathroom.

My problem :
- water pressure from main pipe(gov) consider super slow
- Usually early in the morning until noon(7am-1pm) my house will get no water from main pipe.

I was thinking i could wipe this issue by adding 2 water pump To improve my water pressure, stability and flow.

My thought was :
1- add water pump from main pipe to increase pressure so it will supply into my water tank and kitchen from time to time without failed
2- add water pump near the water tank(roof). To improvise water pressure to all toilets etc.

What you guys think?

Thanks