pressurised water system vs pump

[src1]

In my local pumb shop and speaking to a plumber who advised that I ditch the idea of a pump and a pressurised system would be the best way to go.
What I need - The bath mixer tap will require 1.5 bar. The fixed head shower mixer tap will require 2 bar. Original idea was to feed both off the same feed from a water pump. Have second feed from pump to onsuite shower.
The above plumber advised the pressurised system if the house is set up for it. This would pressurise the house and there wouldnt be any noise. This may cost around 650, but confirmation after viewing. He claims that a decent silent pump would cost about the same.
Our pressure downstairrs is fine and it would only be a benefit upstairs.

Any thoughts on the pressurised system? Is the price a realistic figure for removing the old tank and replacing it with a unit thats pressurised? and what are the running costs like?

 

[John506]

If you mean an unvented cylinder you won't get one of them fitted for £650, it will cost around double that if you're lucky.

They are worth the money and running costs if you are always opening multiple hot taps, and running bath after bath, i.e if you have a large family.

They come in different sizes so you would choose to suit.

This system would give you mains pressure at your hot outlets, and your hot and cold would be most likely balanced so you will have the same pressure on both hot and cold.

Do you just have an old fortic type cylinder at the moment?

Your boiler also has to be big enough to cope with the demand of heating up a big unvented unit, so get that checked out also.

 

[simond]

As always, a pressurised system will deliver the goods as long as the incoming flow rate, and to a lesser degree, pressure are up to providing the number of outlets you intend to use simultaneously.

Most unvented manufacturers stipulate a minimum of 25 litres per minute, but this is just a rule of thumb - if you want to run a shower and a bath, you'll need closer to 35l/m.

The size of boiler required is no different like for like for a similar sized conventional cylinder.