Best unrestrctive wall mounted bath taps at 150mm Centers

[ant2]

The short:

Can anyone suggest a wall mounted tap/mixer at 150mm centers which offers the best flow rate ? I.e little in way of restriction and a 3/4inch connector?

Best I have found is 104.3l/min at 3bar - https://www.bristan.com/product-files/547262/product-data.pdf
But these taps are only 45mm long, the bath plastic is 60mm from the edge, meaning it will not drop in the bath without bringing it out from the wall.
I understand the flow rates are based on 3/4inch to 22mm and not 15mm, but i'd rather have the max from the pipe.

The long:

Currently have 22MM pumped hot + cold (3.5 bar) from unvented system going in to our new bathroom.
From there it goes in to 15mm pipework under the bath, 2ft up the tiled wall and attaches to this tap:
https://www.amazon.co.uk/gp/product/B00A9WH1Y2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

It's taking just over 20 minutes to fill our 1800x800 bath (with the tap flow restrictor removed)

It appears the tap is connected at 3/8 inch and no doubt why I am getting really bad flow. (advertises 21L per minute)

I am looking for a tap that is unrestrictive as possible that will fit in it's place with current pipework. Looking to get the fill to 7 minutes (like you'd expect)

 

[ant2]

bump.. any one ?

 

[oldbuffer]

What hot water system do you have?

 

[ant2]

1.) Hot water cylinder with a 3.5 shower pump. This bath is connected to the shower pump.

2.) As per the pictures you'll see my existing tap, which takes 60 seconds to fill a bucket.
With no tap, it's just less than 30 seconds to fill the bucket.

I tried this tap today - https://www.amazon.co.uk/gp/product/B07GFMKRMH/ref=ppx_yo_dt_b_asin_title_o04__o00_s00?ie=UTF8&psc=1
But it's just as bad.

Next I think I will try https://www.amazon.co.uk/Bristan-VA...id=1547143343&sr=8-4&keywords=bristan+bib+tap


3.)
Incidentally what is the best way to plumb this. I have a brass thread coming out the wall with 3/4 BSP, with a 1/2 bsp chrome female thread (coupler type thing) on top of this breass (doesn't look like it will come off and presume this is part of the connector)
Nearly all the taps I have found are 1/2 BSP and male.

So I bought https://www.amazon.co.uk/gp/product/B079L7LJBX/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1
To fit on to this existing thread, but it leaks at 3/4 end, even with PTFE and as tight as I can get it.
Is there a better way to plumb this in?

4.) Is there an easy way remove this 15mm -> 3/4 bsp connector that is in the wall ? I noticed the plumber has 4 screws in the wall, but the screws all just spin and it feels loose, no doubt he has not used proper rawl plugs.

 

[Madrab]

What 3.5bar pump do you have?

 

[ant2]

What 3.5bar pump do you have?

Trevi 45 twin. 14-50-44243

 

[muggles]

Trevi 45 twin. 14-50-44243

That's a 1.6 bar pump capable of pumping a maximum of 35 litres per minute at 0.2 bar, or 9 litres per minute at 1.2 bar.

You need a new pump, not a new tap. I can recommend the Stuart Turner Monsoon, 4.5bar Twin, which can do up to 80l/min at 0.2 bar and 35l/min at 2.5 bar

You get what you pay for. The head rating on pumps is only a theoretical maximum at zero flow rate. Once you actually turn a tap on and run water through them, the actual delivered flow rate at various maintained pressures will vary enormously

 

[ant2]

That's a 1.6 bar pump capable of pumping a maximum of 35 litres per minute at 0.2 bar, or 9 litres per minute at 1.2 bar.

You need a new pump, not a new tap. I can recommend the Stuart Turner Monsoon, 4.5bar Twin, which can do up to 80l/min at 0.2 bar and 35l/min at 2.5 bar

You get what you pay for. The head rating on pumps is only a theoretical maximum at zero flow rate. Once you actually turn a tap on and run water through them, the actual delivered flow rate at various maintained pressures will vary enormously

Hi muggles,
As per the above the flow rate is double without the tap connected and that flow rate is perfectly adequate. I am not worried about the pressure of the water coming through the tap to the bath, only the flow.

The question is about an unrestrictive tap that doesn't cut flow by half and what connectors are best suited, is this something you could help with?

 

[muggles]

Hi muggles,
The question is about an unrestrictive tap that doesn't cut flow by half and what connectors are best suited

Your original question didn't say that, it said your bath currently takes over 20 minutes to fill, and you want to get it down to under 7 minutes. If your present tap is halving the flow rate over an open-ended pipe, then an open-ended pipe will fill the bath in around 10 minutes, missing your aim of under 7 minutes by nearly 50%, ergo you need a bigger pump. 22mm pipework wouldn't go amiss, either - with such poor pressure from your pump, the water needs all the help it can get.

All taps will provide some restriction, unless you're prepared to bodge something together out of a full-bore isolation valve and an elbow, and so at best you're probably looking at an 11-12 minute fill. The least restrictive wall-mounted taps I can think of are Pegler ¾" bibtaps, which come in hot and cold flavours, just as you'd expect

 

[Hot&Cold]

The question is about an unrestrictive tap that doesn't cut flow by half and what connectors are best suited, is this something you could help with?

Taps with washers, rather than taps with various CD cartridges-CD mixers offer less mechanical resistance as long as the tap handles are fully opened .
Bristan value club pillar bath shower mixer Tap VAC PBSM C MT is an example although a basic (around £50) chinese import they work ok on balanced low pressure feeds.
The above mixer has an attachment for a shower but being non thermostatic the shower has limitations of use. Same as the grohe mixer

 

[ant2]

Taps with washers, rather than taps with various CD cartridges-CD mixers offer less mechanical resistance as long as the tap handles are fully opened .
Bristan value club pillar bath shower mixer Tap VAC PBSM C MT is an example although a basic (around £50) chinese import they work ok on balanced low pressure feeds.
The above mixer has an attachment for a shower but being non thermostatic the shower has limitations of use. Same as the grohe mixer

Thanks. Unfortunately those are pillar taps, so I can't get those on the wall. I think I will try these as they have no cartridge - https://www.amazon.co.uk/Bristan-VA...8-4&keywords=bristan+bib+tap&tag=diynotcom-21

Is there a preferred connector muff between 3/4 to 1/2inch female to female threads? As the bristan take a 1/2inch connector and what's coming out of my wall is a 3/4 BSP female thread. The one I purchased above leaked.

 

[muggles]

Thanks. Unfortunately those are pillar taps, so I can't get those on the wall. I think I will try these as they have no cartridge - https://www.amazon.co.uk/Bristan-VA...8-4&keywords=bristan+bib+tap&tag=diynotcom-21

Is there a preferred connector muff between 3/4 to 1/2inch female to female threads? As the bristan take a 1/2inch connector and what's coming out of my wall is a 3/4 BSP female thread. The one I purchased above leaked.

I posted a link to some ¾" bibtaps in my last reply to you...took quite a while to find them too! Hint - click on the word "hot" for the hot one, and "cold" for the cold one, just in case you didn't notice

 

[ant2]

I posted a link to some ¾" bibtaps in my last reply to you...took quite a while to find them too! Hint - click on the word "hot" for the hot one, and "cold" for the cold one, just in case you didn't notice

Thanks. Will see how these bristan's go, those Prestex ones are over £150 plus delivery. Half way to a brand new shower pump at that price

 

[Hot&Cold]

The bristan value is either deck or wall mounted,just ditch the legs for wall mounting

 

[ant2]

The bristan value is either deck or wall mounted,just ditch the legs for wall mounting

Good to know, although the diagram for ' VAC PBSM C MT' shows them at 180mm centers?
Hoping these will be just as unrestrictive - https://www.amazon.co.uk/Bristan-VA...8-4&keywords=bristan+bib+tap&tag=diynotcom-21 ?

Any one have an idea on (3) above ?
Incidentally what is the best way to plumb this. I have a brass thread coming out the wall with 3/4 BSP, with a 1/2 bsp chrome female thread (coupler type thing) on top of this breass (doesn't look like it will come off and presume this is part of the connector)
Nearly all the taps I have found are 1/2 BSP and male.

So I bought https://www.amazon.co.uk/gp/product/B079L7LJBX/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1
To fit on to this existing thread, but it leaks at 3/4 end, even with PTFE and as tight as I can get it.
Is there a better way to plumb this in?

Read more: https://www.diynot.com/diy/threads/...h-taps-at-150mm-centers.515734/#ixzz5cIVzVrzI