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Ideal Vogue 32kw combi MAX. Two showers at the the same time.

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I did add to an existing post of mine (from March this year) noting that I'd had a Vogue 32 fitted. It hasn't attracted much response, which is no problem, and it will rest in peace.



But there's often conversations here about whether or not a combi will serve two simultaneous showers and I can now speak from personal experience having had my Ideal in for a couple of weeks. Admittedly in the middle of summer when the incoming water is warmer than in Jan or Feb.

I did make a post, some time ago, in which I said I was going to supply the combi with a specific 22mm supply taken directly after where the incoming 25mm MDPE enters the house (under the sink in the kitchen) going straight to the boiler...... I said I would provide the aforementioned supply with a Reliance drop tight 22mm pressure reducing valve and a Pegler full bore isolating lever valve. I also said I've provided a 28mm gas supply serving the boiler only (reduced to 22mm for the last feww metres.) I would have also said the pressure and flow to the house is excellent.

There are two Mira 903 thermostatic mixers - one in the bathroom, one in the en-suite. They used to be fed by gravity from the tank in the loft and the water heated by a 28 year old Ideal Classic cast iron 50,000 boiler and a copper cylinder in the airing cupboard.

All that is now gone.

The Mira mixers have a selector on the back for LOW pressure or HIGH pressure. It's now on HIGH. I've fitted an Ideal 12 litres per minute restrictor in both shower hoses. Without the restrictor the shower is fierce. Too powerful for us,

The upshot is I CAN run two very satisfactory showers at the same time. I can flush a toilet and not notice the difference in flow at the shower (one shower, not two .... I haven't tried two). I seem to be able to use the garden hose and run one shower similarly.

There's only two of us and the system seems absolutely fine.

I know Bernard won't want to hear the above but I can only speak as I find. Others with substantially less pressure and or flow will have a different experience I expect. And there's no immersion heater to fall back on (before he mentions it). As it happens after ordering the boiler I did turn the immersion on for no particular reason .... and there was a bang and a flash due to the immersion cap being full of water. Closer inspection showed it was decidely manky and must have been letting by for a good while without me noticing.

There were some on here who said I'd wasted my time and effort by running the separate 22mm from the main cold water inlet before it fed the rest of the house. They might be right and perhaps it makes no difference and the system would work just as well if I'd fed the boiler further up the house. We will never know.

I can say with some certainty though ... it's great not having the stuff in the loft and airing cupboard. I've tidied both areas up, had the installers fit a radiator in the cupboard and fitted a 40 watt Dimplex tubular heater in the cupboard and the wife is happy that theres now somewhere to store two vacuum cleaners, an ironing board, a telescopic loft ladder plus a few other bits and bobs.

All seems OK as we speak.

I repeat the thanks I offered in the other thread for the views, assistance and interest in the ( too much) time I spent deliberating on what to replace the Classic with.
 
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I know Bernard won't want to hear the above but I can only speak as I find.

Often people find only what they are looking for.

So, Bernard, we've established you're not a heating engineer, nor a plumber, but someone who knows of a few cases in your village where a heating system repair took a couple of days.
And, from beyond my village, the results / recomendations from a passive house research program 1974

Philips Experimental House Research 1974 ( Passive versus Active measures in Europe and America )

 
All seems OK as we speak.
I had a relatively small, old combi, in quite a large house, which has now been replaced with one of the same output.

Never been an issue for me.
 
A 32kw combi will provide a flow rate of 21.84LPM, say 22LPM or 11LPM per shower if both in use from a now 19C mains to give a showering temp of 40C but in winter, with mains at 7C, only 13.89LPM, say 14LPM or 7LPM/shower or if both demanding 11.0LPM then the showering temp falls to 28C (27.84C), if both thermostatic and set to 40C will both reduce the flowrates to 7.0LPM each?.
 
A 32kw combi will provide a flow rate of 21.84LPM, say 22LPM or 11LPM per shower if both in use from a now 19C mains to give a showering temp of 40C but in winter, with mains at 7C, only 13.89LPM, say 14LPM or 7LPM/shower or if both demanding 11.0LPM then the showering temp falls to 28C (27.84C), if both thermostatic and set to 40C will both reduce the flowrates to 7.0LPM each?.

Just run those numbers by me one more time…..

IMG_6211.gif
 
I think I've mentioned John the mathematician's obvious predilection for calculations and probably suggested that they clearly have their place - but not necessarily in reply to my own, simple and modest contributions.... but it's probably best not to dwell on it to any great degree.

Without resorting to calculus, all I was saying is that the boiler in question, and the very respectable flow/pressure rates at my place ( and, possibly, the provision of a specific 22mm unmolested cold water supply going directly to the boiler from the point where it enters my house) have resulted in two decent showers being possible at the same time. Something that others have asked about and some have had problems achieving.
 
I can't believe you asked why John.

In fact I can't believe you did actually " run them past " again.
 
Ideal Vogue come up with a flowrate of 13.1LPM with a dT of 35C. Using my calculation method, I come up with, 32*860/60/35, 13.1LPM, just substitute 35 with any dT you care to use and you will get the flowrate OR go to any of the probably dozens of formulae available on line.
 
Thank you John, but may I now respectfully ask that we let the matter of mathematical formula drop. It's not the direction I envisaged when posting the topic. I believe I've made a similar request when you supplemented another of my posts with calculations that, to be honest,didn't add to the topic in the way envisaged.

I asked Bernard to refrain from adding to a previous post I made but he hasn't taken the hint.

I think maybe I'm not cut out for this forum malarkey.
 
Respectfully, Mr.B, the thread title says "Ideal Vogue 32kw combi MAX. Two showers at the the same time.", there are lots of discussions on these web sites from time to time, your's is just another one, you complained in post #1 that your other thread hadn't attracted much response which "is no problem" but this thread has attracted a few responses which, bearing in mind again, the "Two showers" content may have been of interest to other people interested in doing the same, I merely pointed out the flowrates to be expected under different conditions, which I think IS of interest to some people, I just posted the numbers without any formulae, it was @Mottie who asked to run the numbers past him and, again, maybe in jest?.
 
All received, thanks all. Like I say I'm probably not an ideal candidate for forums. I'll keep it to a minimum.
 

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