Linking Two Unvented Cylinders

[SimonG]

If x and y are greater than 2, then install an iso valve outside the bathroom to prevent over long showers. 🙂

 

[rpm]

If x and y are greater than 2, then install an iso valve outside the bathroom to prevent over long showers. 🙂

One with a timer to reduce the chance of getting caught turning it off?

 

[chris watkins]

Sorry Chris, there is an error in your maths.

The calculation for stored water is:

W = 210 + (x^3 x 100) + (y^2 x 100)
--------------------------------------------
n

Where W is the amount of stored water in litres, x is the number of teenage girls living in the house, y is the number of women of any other age in the house, and n is the number of wild horses you have to hand in order to get said females out of the bathroom.

Ah well, 4 boys & 1 wife only ever exposed me to basic arithmetic's Ray, I will stand corrected by your high math skills, as ever.

All that algebra, just like the fairer sex, was something I just could never get my head around!

Being a more practical man I use have applied something someone once told me & ended up with this when applied to yours N = X+YS<W were S is the showers required W should always be less than this.
Field testing has always indicated a substantial drop in the number of horse power required.

 

[Dragoon]

Hi All.

Still waiting for a response from the plumbers, but in the meantime, what do people think of an average sized unvented cylinder for shower and the rest of the house, and a separate small Combi to heat the occasional bath water?

The incoming flow rate seems pretty good enough to cope with this. However if it wasn't good enough, the resulting drop in water flow to filling the bath, wouldn't really matter as much as if there was a drop in flow rate to the shower.

It would obviously work out more expensive, but may be cheaper in the long run.

 

[Dragoon]

Hi I don't really know why but until I just posted my above question, I wasn't able to see a reply from anyone else other than Ch4. Now suddenly I can see all the other replies. I thought no one was reading this thread!

I'm new to this posting thing and must be doing something wrong.

Anyway I'll read all the other replies and get back to you soon.

 

[Cardiff Plumber]

Hi Dragoon,

Use a thermal store with a pumped return, if cws supply is an issue use a break tank with a pump and pressurized vessel.

I have a lot of experience with hot water systems. I fitted similar system and all the underfloor heating including the heat extraction system on the telecom's room on top of the tower. This was on this project in Lymm, Manchester, see here: Lymm Water Tower - the art of housebuilding

 

[Dragoon]

Hi Ray.

The size of the incoming blue main is 25mm (I just measured it with a tape measure so may be a millimetre or two out.)

 

[Dragoon]

Hi Best. I think that's a really good idea about the different levels of heating coils.

 

[Dragoon]

Hi AWheating. Thanks for the welcome!

I would really like to say where I am located, however I think I should wait for the replies from the plumbers I have already asked, otherwise they may get a bit offended that I didn't wait for their answers. I may do so at a later stage though.

 

[Dragoon]

Hi Simon G.
Yes as posted earlier, I was thinking along those lines as well. However I don't know if that would be better than what Best suggested about the different coil heights.

 

[Dragoon]

Hi Gray0689

Could you explain what a solar thermal is please.

 

[Dragoon]

Hi Chris Watkins, I’ll do the calcs and get back to you later.

Hi Ray Stafford, the calculation should be quite simple as Y (No of women) =1. However is there a there a variable I should add to the eqn. for the Predictability of Y?

 

[Dragoon]

By the way, I think I realise why I couldn't originally see all the other replies. I didn't realise that there were different pages so was only looking at page one:blush5:

However, I didn't receive any email alerts either so I still don't really know.

 

[Ray Stafford]

Hi Chris Watkins, I’ll do the calcs and get back to you later.

Hi Ray Stafford, the calculation should be quite simple as Y (No of women) =1. However is there a there a variable I should add to the eqn. for the Predictability of Y?

You still need at least 1 wild horse (or reasonable fraction thereof) otherwise the calculation comes out as div by 0.

The predictability of women is such a vanishingly small number that it eludes description even by advanced quantum theoreticians. However, the square root of FA is a good approximation.

 

[SimonG]

Hi Dragoon,

Use a thermal store with a pumped return, if cws supply is an issue use a break tank with a pump and pressurized vessel.

I have a lot of experience with hot water systems. I fitted similar system and all the underfloor heating including the heat extraction system on the telecom's room on top of the tower. This was on this project in Lymm, Manchester, see here: Lymm Water Tower - the art of housebuilding

Definitely not a thermal store, unless you are connecting in multiple fuel sources.

 

[Dragoon]

Hi Cardiff Plumber.
Wow what place that Lymm Water Tower is!!! I wish mine was anywhere near as good! Impressive work!!

I have considered Thermal Stores before and they sound a good idea. The only problem I have with them is that not many plumbers are familiar with them, so if and when things go wrong with them, I wouldn't be able to just phone the first available plumber to sort the problem.

Also in my particular case, wouldn't it again involve heating a large cylinder of water for the occasional use of the bath?

 

[Dragoon]

Lol!! Yeah, wasn't it this Predictability factor that first lead scientists to discover quantum theory?!

 

[Dragoon]

Hi Bogrodder.

There's a temporary curved 25mm copper pipe, shaped like a tap with a lever ball valve as a tap connected to the blue incoming mains. (there is also stopcock on it but I've left that open).

I filled a bucket to 25 litres in 25 seconds. I don't know the pressure as I don't have a gauge.

Bye the way I'm sorry if this is the second time you've received this reply as I'm sure I've already sent it, but I cannot see it on the page. It may have something to do with me using Safari as a browser. Anyway apologies again.

 

[snowhead]

However is there a there a variable I should add to the eqn. for the Predictability of Y?

This is the missing constant ∞

 

[Dragoon]

Hi Snowhead.
Lol! I think that symbol (which I can’t do on my keyboard) = Unpredictability.
So Predictability would be 1/ (that symbol) which would make it pretty close to zero as Ray stated.

It’s a good thing that there aren’t many female plumbers out there or else we’d get deluged with lots admonishing replies from irate members.

In fact I’m going to have to have the Hide button ready when writing in this forum, just incase she walks in! . . . . . . Which will be okay cos she’ll think I’m just looking at naughty stuff again, which is usually considered a lesser crime than any form of direct criticism!