Urgent advice - Replacing gravity water system

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We need an urgent advice, we have a gravity water system and we are in a middle of loft conversion. We are adding an en-suit in loft and prefer to have a good water pressure there.

What we want, is to either be able to run multiple showers at once, or if one person is having a shower, other people can run taps/use water within the home. But we are not sure if it is achievable due to limitations. At the moment we can only use the water for one thing in the home, which is making it very difficult on our growing family.
The water supply from the main is shared so there is no option to replace the water pipes. Here are the readings;

Static Flow: 16-18 l/m (using garden tap)
Dynamic Flow: 8 l/m

Static Pressure: 2 to 2.3 bar (using garden tap)
Dynamic Pressure: 1 bar (garden and toilet taps)

We had a discussion with different plumpers and they all had different opinions. Here are the options which we got from different plumpers for running multiple showers;

1- 35kw to 40kw combi boiler
2- 210L unvented cylinder with existing 18kw boiler
3- Unvented cylinder with DAB pump using existing boiler
4- Unvented cylinder with system boiler
5- Stick with the gravity system and include water pump ( hot water cylinder and pump will have to go in bedroom due to lack of space and we are worried about the pump noise). The water tank in loft will have separate mains and multple showers can be run at the same time.

We would really appreacite if someone can give us a professional advise here as we don't want to spend money on a system which is not going to work at the end.
 
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Your dynamic flow rate is 1 litre per minute ??? Surely not ?
 
You need to find out where the restriction is. It would be worth getting your local water undertaker out to find out what flow rate is available at the stopcock / water meter in the road. If they can get much more flow there than you can get in the house, then either your stopcock is blocked / not open fully, or the supply pipe to your house is restricted. What size and material is your incoming main?
 
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You need to find out where the restriction is. It would be worth getting your local water undertaker out to find out what flow rate is available at the stopcock / water meter in the road. If they can get much more flow there than you can get in the house, then either your stopcock is blocked / not open fully, or the supply pipe to your house is restricted. What size and material is your incoming main?

Inside the house its 15mm.

Waiting time is too long atm, water supply company would take 3 months to supply a separte line to our house or even look into our query.

We can't wait that long.
 
You could dig a trench to the boundary of your property and lay a new, larger, plastic pipe, connecting it to the stub of the old pipe downstream of whatever stopcock you have. It is highly likely that this would greatly improve the flow. In the fullness of time you could get the water company to connect it. They might do it free if you have lead pipes or if you get a water meter fitted. Make an access pit at the boundary and fit a full-bore stopcock

If you do have lead pipes, immediately request them to test lead content of your drinking water as this may attract a subsidy. The test must be done before work starts.
 
Inside the house its 15mm.

Waiting time is too long atm, water supply company would take 3 months to supply a separte line to our house or even look into our query.

We can't wait that long.
Surely better to wait 3 months and do the job right than to rush it now and end up with a system that doesn't work the way you want it to? It's either this or a tank and pump setup, so you need to decide whether you'd prefer a noisy system or one that takes a bit longer to install but is quiet
 

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