Plumbers - loo flushing/bath running
Plumbers - loo flushing/bath running
Author
Discussion

5MUG

Original Poster:

734 posts

288 months

Wednesday 3rd August 2011
quotequote all
If there are any plumbers out there in the PH massive I would be grateful for some info.

We have just had a pressurised system put in and now when I run the bath and leave it running to have a pee, when I flush the loo the bath runs less, while the loo flushes and the cistern fills up.

To my mind, for an up to date system that is pants.

Anything we can do? The plumber that put it in says its because of the pressure from the mains not being too good.


dickymint

28,525 posts

282 months

Wednesday 3rd August 2011
quotequote all
5MUG said:
If there are any plumbers out there in the PH massive I would be grateful for some info.

We have just had a pressurised system put in and now when I run the bath and leave it running to have a pee, when I flush the loo the bath runs less, while the loo flushes and the cistern fills up.

To my mind, for an up to date system that is pants.

Anything we can do? The plumber that put it in says its because of the pressure from the mains not being too good.
shout Simpo - over to you.



















Sorry I'm pissed wink

R1 CKY

6,618 posts

243 months

Wednesday 3rd August 2011
quotequote all
Sounds like a very poor flow rate from your mains.

My house does the same and the idiot before me installed a combination boiler, so there is no chance of having a decent shower with the washing machine running.

Arthur Jackson

2,111 posts

254 months

Wednesday 3rd August 2011
quotequote all
It's not pressure, it's a flow problem. Who specified an unvented system, because it sounds like they have royally fked up...?

S70JPS

621 posts

244 months

Wednesday 3rd August 2011
quotequote all
I have just put a system boiler in. It required a 25mm mains feed so i had a new main put in (on the lead replacement scheme). If someone flushes i see a marginal increse in shower temp. but otherwise nothing. I can run 3 baths at the same time with little effect on the flow. Possibly suggest your mains flow is inhibited due to age (furred up mains pipe).

Arthur Jackson

2,111 posts

254 months

Wednesday 3rd August 2011
quotequote all
S70JPS said:
I have just put a system boiler in.
A 'system boiler' refers to the heating, not the domestic water. confused

King Herald

23,501 posts

240 months

Wednesday 3rd August 2011
quotequote all
It doesn't matter what you do to the house pipes, what system you use, the water will only flow as fast as the smallest restriction in the pipe supplying it. If the main water pipe in from the street is clogged down to the size of a pencil, you'll never get much flow through it.


S70JPS

621 posts

244 months

Wednesday 3rd August 2011
quotequote all
Arthur as above my hot runs at the same pressure as the mains cold. that was the whole point of my decision to fit this system. System referring to the heating and hot water. Unvented under pressure. Hot water tank run directly from a 25mm mains feed.


Edited by S70JPS on Wednesday 3rd August 21:02

Wheelrepairit

3,020 posts

228 months

Wednesday 3rd August 2011
quotequote all
5MUG said:
when I run the bath and leave it running to have a pee, when I flush the loo the bath runs less, while the loo flushes and the cistern fills up.
Why not just pee in the bath, problem solved.

Arthur Jackson

2,111 posts

254 months

Wednesday 3rd August 2011
quotequote all
S70JPS said:
Arthur as above my hot runs at the same pressure as the mains cold. that was the whole point of my decision to fit this system. System referring to the heating and hot water. Unvented under pressure. Hot water tank run directly from a 25mm mains feed.
Yeah, sorry, I was just clarifying.
A 'System boiler' is a heating only boiler which has a pump and expansion vessel included.
An unvented cylinder, incidentally, will only be running at the pressure of the mains cold if the mains pressure is fairly poor. The cylinder will always be governed by a PRV to protect the cylinder. 3 bar is about the upper limit for most unvented cylinders, whilst pressures of 6 bar and up are becoming common in some placeson mains supplies. Flow rates, however, remain poor and unvented hot should NEVER be considered on a main flowing under 25 litres a minute.

5MUG

Original Poster:

734 posts

288 months

Wednesday 3rd August 2011
quotequote all
OK you've lost me now.

jason s4

16,810 posts

194 months

Wednesday 3rd August 2011
quotequote all
Arthur Jackson said:
A 'system boiler' refers to the heating, not the domestic water. confused
Incorrect.

A system boiler is a type just like a combi is..

R1 CKY

6,618 posts

243 months

Wednesday 3rd August 2011
quotequote all
He is correct, a system boiler has no relevance to what type of hot water system is in place.

Having just a system boiler installed will have no effect on the cold main.

Simpo Two

91,581 posts

289 months

Wednesday 3rd August 2011
quotequote all
dickymint said:
shout Simpo - over to you.
I got as far as wondering what the mains pressure had to do with the pressure in a pressurised system, but no idea after that, sorry.

I'll stick with my 23 year-old unserviced boiler and gravity fed system. It's simple, it works, it costs pennies to run. When it finally breaks I'll buy another one.

roofer

5,136 posts

235 months

Wednesday 3rd August 2011
quotequote all
Wheelrepairit said:
Why not just pee in the bath, problem solved.
Made i chuckle biggrin Your plumber is a w@nker for not doing a flow test prior to fitting...imeo.

anonymous-user

78 months

Thursday 4th August 2011
quotequote all
Mine does exactly the same & is quite normal IMHO

Bath & loo are now mains fed?
They are probably off the same pipework in bathroom, so the flow to the bath is bound to reduce when loo is flushed.
Why not wait until the bath is run before flushing, problem solved!!


5MUG

Original Poster:

734 posts

288 months

Thursday 4th August 2011
quotequote all
Thanks all. We have a plan.

karona

1,928 posts

210 months

Thursday 4th August 2011
quotequote all
The plumber has turned the main stop valve all the way on again, hasn't he? Not just cracked open a bit while he tested for leaks while the system filled up again?