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PostPosted: Sun May 21, 2017 9:19 am 
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@ Scruff. I bow to you knowledge on this Scruff but I thought that the Megaflow tank pressure would keep the hot flow consistent. Thinking about it I suppose if the drain on the tank is greater than the incoming supply can refill it then the pressure will gradually drop as the diaphragm drops in the tank reducing the pressure. How fast this would be would depend on the shower(s) usage of the hot. A bath running and a shower woudl kill it pretty quick I guess. I stand corrected.

In the original post Solorize was looking at the two showers in his home being used simultaneously(? ) A Megaflow will certainly allow that but I had not considered the mains pressure is vital to the equation. :thumbright:


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PostPosted: Sun May 21, 2017 7:25 pm 
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In all fairness I think you are thinking of something completely different DWD.

A megaflow is just an ordinary cylinder but for mains pressure. If 10 Ltrs/m go in then 10Ltrs/m comes out.

Look up Accumulators and even they are limited to the static pressure of the mains.



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PostPosted: Sun May 21, 2017 7:29 pm 
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solorize wrote:
Ok I pulled out a smaller fermenting bin this morning (10 litres) and then checked
it by filling it up with the 2 litre plastic measuring jug, and the water does hit the
10 litre mark. So I know that the fermenting bin is scaled correctly.

I then cranked up my mains water stop cock to fully open and then turned it back
a tiny bit.

So I then timed filling it up to the 10 litre mark twice and both times it came out
at 47 seconds. So that then equates to ~12.7 litres/minute.

I carried this out at 8:00am.

So averaging out all my timings it gives me: ~12.6 litres/minute.


With that in mind what would be my best option to improve my showers?


Test the pressure with other taps open and closed, peak and off peak times. :thumbright:

http://www.screwfix.com/p/monument-tool ... auge/82412



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PostPosted: Tue May 30, 2017 6:34 pm 
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Quick update.

I had a plumber come around this evening to have a look and suggest
what I could have to help improve my showers.

He measured the water from my outside tap with a jug thing that
had measurements up the side and he was very impressed as it
went off the scale!

Thinking about the tests I did with my kitchen tap, I have one of those
screw in spray or straight flow adaptors on it which I guess was throttling
the flow of water as it had to pass through a narrow neck! So was not
giving me a correct reading. doh! lesson learnt ;-)

He suggested that I should go for a 170litre megaflow unvented cylinder.
Which he recommended over the Worcester Bosch unvented cylinder.
(and he will get rid of the tanks in the loft).

He also said I could keep with my old regular boiler, but advised (not pushed)
that I could replace it with a Worcester Bosch 18i System boiler, as my current
boiler is ~15years old. (which is what I will probably do).
He is going to give me two quotes one with just unvented cylinder and the other for boiler as well.

BTW.
Thank you all the various advice and info you provided me on this forum
as it helped me ask him the correct questions and I kind of knew what I was
talking about LOL.



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PostPosted: Tue May 30, 2017 10:45 pm 
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Hi Thanks for the feed back.

I would recommend the Megaflow cylinders, However Provided you have the space and floor strength, I suggest you go with the 210 over the 170. only about a £100.00 more.

In an ideal world you need to upgrade the internal cold mains to 22mm, but his quote should cover what needs doing.

Also make sure he is G3 qualified.



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PostPosted: Wed May 31, 2017 1:48 pm 
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If they are not G3 qualified, should I avoid using them?

BTW.
Is there a way to find out online if they are qualified?
if not I will ask them this evening.



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PostPosted: Wed May 31, 2017 4:14 pm 
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Yes it would be an illegal install.

Look them up on Gas Safe website, it may say there if they are, mine does.

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PostPosted: Wed May 31, 2017 7:13 pm 
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OK just check on the gas safe website and it states:

'Vented Cylinders'

Nothing about Unvented =/

I have sent them an email to ask if they are G3 qualified.
So will wait and see what they come back with.

Do you know if sometimes the gas safe website does not
show the most current / all info?

I am just wondering if they come back and say "Yes we are G3 qualified"
how else would I be able to check 100% that they are.


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PostPosted: Wed May 31, 2017 8:12 pm 
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Contact gassafe otherwise take it as no.

Ps there may be something on their headed paper when they quote.

About time you had a skills card to say when you take the course, but been saying that for 20 years.

Ps 2. He could have a JIB-PMES card it will be on that


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PostPosted: Wed May 31, 2017 9:06 pm 
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Gas Safe will only have them listed if they have told them themselves.

It is not automatically passed onto Gas safe like the acs Gas exams we pass.

They may also register their unvented cylinders through another official body.

Ask them who they are registered/passed with e.g. Logic, citb etc

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PostPosted: Thu Jun 08, 2017 1:48 pm 
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Just thought I would give you an update.

I had another plumber come round to give me a quote for similar set up,
but he did advise that I should keep my central heating off the pressurized
unvented cylinder system as it could cause leaks, due to the age of my property
(built ~1980).

So he suggested that I go with a Worcester Bosch 18RI condensing Regular Boiler,
getting rid of the cold water tank in the loft, but keeping the central heating
header tank there so as to keep the central heating gravity fed.


After comparing quotes I have decided to go with this plumber as
he came in cheaper than the first company that quoted
and he suggested I go for a Worcester Bosch Boiler and Unvented Cylinder
so I can get a 9 year parts and labor warranty. He is 100% G3 qualified.
(He will also upgrade the internal cold mains to 22mm).

He was also shocked at the flow rate from our garden tap which was 28.5 litres/minute =)


So I will be getting installed:
Worcester Bosch 18RI condensing Regular Boiler
Worcester Bosch Greenstore 210 SC condensing Regular Boiler


Just got to get everything out the airing cupboard now ;-)

Fingers crossed I should have a much more powerful shower soon =)



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PostPosted: Mon Jun 26, 2017 1:01 pm 
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Quick update.

Just had the new boiler and unvented cylinder installed and wow! What a difference that has made.
I took a shower this evening and got absolutely blasted with water. It was coming out so fast it
was causing wind turbulence in the bathroom. I ended up having to turn the mixer taps down to 1/3 flow.

So really happy now.

One quick question I forgot to ask my plumber, that I hope someone can answer: Now I have mains
pressure hot and cold to all taps, is it as safe to drink cold water from say the bathroom taps as it
is from the kitchen taps?


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PostPosted: Mon Jun 26, 2017 5:45 pm 
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Yes

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PostPosted: Mon Jun 26, 2017 6:36 pm 
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Happy new shower.
:huray:

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PostPosted: Mon Jun 26, 2017 6:37 pm 
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Thanks for confirming :thumbleft:


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