What size of connection required for water 25 or 32mm?

[CalvinHobbes]

Just applying for our connection. Unsure which to go for. 

[nod]

I’ve had a 25 mil connection on this and our previous build 

[Nickfromwales]

Depending on the size of house / number of bathrooms, afaic a 32mm connection would be a no-brainer, as long as it wasn’t hugely more expensive? 
As urban areas get developed, the water pressure will head downwards, so consider future proofing too.

Length of pipe run? 
Lots of variables to consider. 

Edited October 21, 2022 by Nickfromwales

[Andehh]

Surely no matter the size of the pipe into the house, flow restrictions exist which bring it down... Boiler, heating tank, valves, taps etc? 

[CalvinHobbes]

Thanks. 4 bathrooms and the water has to rise up a steep slope. Just wondering - why do we need a NEW connection? Like right now we have one (in the house we are about to demolish) Can we not just redirect the pipe on our land to the edge and link it to a tap for building? 

[Conor]

5 hours ago, CalvinHobbes said:

Thanks. 4 bathrooms and the water has to rise up a steep slope. Just wondering - why do we need a NEW connection? Like right now we have one (in the house we are about to demolish) Can we not just redirect the pipe on our land to the edge and link it to a tap for building? 

If you've an existing connection then just use it and save yourself a chunk of money. Replace the pipe that's on your land from the roadside onwards with 25mm mdpe pipe. Remember, you own the pipe from the stopcock/meter box onwards. And as you say, you can put a stand tap at this point as well to serve the construction. Exactly what we did. Dig down at the hedge, found the pipe, cut I and stuck on a tee, post and tap on one beach, and th other ran to the building. There's little point in paying NIW a grand or two to replace the metre or two on their side. Unless it happens to be lead, in which case they'll do it for free. 

[Nickfromwales]

10 hours ago, Andehh said:

Surely no matter the size of the pipe into the house, flow restrictions exist which bring it down... Boiler, heating tank, valves, taps etc? 

Dynamic pressure and flow will be affected by the size and distance of the pipe vs what is deliverable from the main that it is tapped off.

It matters a lot.  especially if the local mains is shite and you wish to preserve ever ounce of potential from it.

 

5 hours ago, CalvinHobbes said:

why do we need a NEW connection?

No idea? Maybe the thread title should have been "do we need to upgrade to a new mains connection"  

Have you experience of this service performing well? Can you do a static and dynamic flow / pressure test before we get any further into this discussion?

 

27 minutes ago, Conor said:

If you've an existing connection then just use it and save yourself a chunk of money. Replace the pipe that's on your land from the roadside onwards with 25mm mdpe pipe. Remember, you own the pipe from the stopcock/meter box onwards. And as you say, you can put a stand tap at this point as well to serve the construction. Exactly what we did. Dig down at the hedge, found the pipe, cut I and stuck on a tee, post and tap on one beach, and th other ran to the building. There's little point in paying NIW a grand or two to replace the metre or two on their side. Unless it happens to be lead, in which case they'll do it for free. 

Defo, if it's up to par. Whilst machines are on site, it's a no-brainer to dig to the boundary and replace the incomer to MDPE imho.

 

If there was a dodgy stopcock at the pavement, occasionally vandals would strike ( after we'd all left site ) and the ancient brass stopcock would be turned off so tight, by the vandals, that the head of the tap would get snapped off the shaft. The water authority would then have to come and replace that U/S stopcock to a nice new 25mm MDPE one, and connect the new 25/ 32mm client pipe to it, within a set number of hours too   Bloody vandals couldn't have timed things better......

[CalvinHobbes]

Thank you so much, seriously chuffed with that.💃 The flow was fine for the cottage that was there. The main thing is that I don't then have to do anything right now about it. The building can start with them using the water source that's in place .Cheers.