Low water pressure

[Old Account]

Hi lads,
I hope you all are ok.

i was wondering if anyone could help me out and give me some solutions on how to solve the low water pressure.

System: sealed system,
Boiler: condensing boiler, British gas
532/i
373 FD 690
GC no. 47.406.02
Serial No. 05703



Problem: once you open the downstairs kitchen tap or the tap in the extension ( any tap ), but in the same time another tap upstairs the pressure drops a lot. I understand that when a boiler does 15lpm then you will get only half but the pressure is not even half its very very little. There is no kinked pipes/hoses and filters are clean. It's just looks like the boiler is not capable of providing enough pressure.

if you use the taps separately without opening any other tap it's fine.
All isolation valves are not full bore.

Now, my question is there any chance to solve it, if so how?

- do you require a more powerful boiler with more kw ?
- could be the boiler undersized for this property ? ( 2 bathrooms )
- can you install a boost pump of Stuart Turner before the boiler ( flomate mains boost extra ) of Stuart Turner ? Or Iboost better idea ?

The customer hasn't got enough money to install a new boiler and therefore he was looking for a booster pump.

I would appreciate if anyone has got a solution for me.


Thnak you very much for you help

kind regrads

ron

 

[newcastle phill]

Its an age old problem with combis and par for the course.
Even a 40kw would take a performance hit with 2 taps open.
Have you measured the flow with a weir-cup ?

 

[Old Account]

Its an age old problem with combis and par for the course.
Even a 40kw would take a performance hit with 2 taps open.
Have you measured the flow with a weir-cup ?

Hey Phill,

Thank you for text.

I've measured and I had around 11-12lpm but as mentioned earlier once I open the tap upstairs it goes down to Chinatown

Could I solve the issue with a mains booster pump which is installed before the boiler ?

Or do you have a different solution ?

 

[Old Account]

Its an age old problem with combis and par for the course.
Even a 40kw would take a performance hit with 2 taps open.
Have you measured the flow with a weir-cup ?

Hey Phill,

Thank you for text.

I've measured and I had around 11-12lpm but as mentioned earlier once I open the tap upstairs it goes down to Chinatown

Could I solve the issue with a mains booster pump which is installed before the boiler ?

 

[Last Plumber]

As above, measure it.

Measure the flow with a weir cup and the pressure ( with a gauge ).

Measure the flow on the cold main into the house at the first draw off point and measure the pressure there too.

That will give you an idea if there's an issue in the house somewhere. It's always a good idea to start with knowing what's supplying the system in my opinion

 

[Old Account]

I have got 11-12lpm , 1,3bar pressure

 

[Last Plumber]

So at the taps you can only really expect 4-5 LPM in my opinion !

Is that about right ?

 

[Old Account]

That's roughly what I get not much more I'd even say 2/3liters

What's the way of increasing ?
Pump ?

 

[Last Plumber]

You'll still be sharing the amount the combi can give out.

Even if you managed to increase the flow through the Boiler ( some have restriction by design)
you can only get a 35 deg rise at the flow rate the MF's give, so the water at each draw off point will be a lot cooler than you desire. That Boiler I think, is 12.75 LPM.


My opinion is, you've got the wrong set up if you want to draw two or more taps at a time.

 

[Old Account]

You'll still be sharing the amount the combi can give out.

Even if you managed to increase the flow through the Boiler ( some have restriction by design)
you can only get a 35 deg rise at the flow rate the MF's give, so the water at each draw off point will be a lot cooler than you desire. That Boiler I think, is 12.75 LPM.


My opinion is, you've got the wrong set up if you want to draw two or more taps at a time.

Thank you very much for your help and advise.
What would you suggest to the customer ?
What could be done to make it working ?

 

[Last Plumber]

If the Boiler is working as it's supposed to do, there's not a lot you can do tbh.

It won't share between two draw off's very well.

 

[Last Plumber]

If the Boiler is working as it's supposed to do, there's not a lot you can do tbh.

It won't share between two draw off's very well.

 

[Old Account]

If the Boiler is working as it's supposed to do, there's not a lot you can do tbh.

It won't share between two draw off's very well.

So there is literally no solution to solve that problem?

 

[PlumbBobBob]

So there is literally no solution to solve that problem?

no, because a booster pump will only give you 12lpm so no increase

 

[Old Account]

no, because a booster pump will only give you 12lpm so no increase

Right, thank you all for your help.

Appreciate it

 

[robj20]

You could fit a hot water tank and pump. Just have the boiler provide hot water to the kitchen and the tank the bathroom.