James
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| posted on 12/10/13 at 11:59 AM |
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Required water flow rate for new boiler
Another boiler question.... must be that time of year! 
I've been looking at a Worcester Bosch system boiler. I want a 300L tank to go in the loft.
What I can't find anywhere is the required water flow rate I need for this.
We currently have approx. 7lt per minute at 3 bar. Out in the street it is 19lt per minute so if I fit a new 22mm main I can get that.
What do I actually require for the Worcester Bosch Greenstar 30CDI? (or similar sized boilers?). I must be being stupid as I can't find that
figure with many hours on Google or searching spec' PDFs from WB website! 
Cheers,
James
P.S. Its fair to say I don't really understand this subject too well yet. So I realise I may be asking a very dumb question.
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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clanger
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| posted on 12/10/13 at 01:22 PM |
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300L tank in the loft  better strengthen the rafters a bit that's over 1/4 ton of water !!!
depends how fast you want fill the tank with hot water which will determine what size boiler you need, this will ultimately depend on the min/max flow
rate through the boiler..............???? most boiler manufacturers will have this in the blurb somewhere???
all the best...................
PS
don't forget to place the tank above the missus side of the bed 
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James
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| posted on 12/10/13 at 01:49 PM |
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quote:
Originally posted by clanger
300L tank in the loft better strengthen the rafters a bit that's over 1/4 ton of water !!!
PS
don't forget to place the tank above the missus side of the bed
Good plan!
That can't be much bigger than the massive tank that's up there already though? Will go attack that with tape measure.
Cheers
J
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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HowardB
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| posted on 12/10/13 at 04:18 PM |
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for ref my boiler says 12l/min,.. typ I run it at 15l/min.
not sure that is of any help at all,...
Howard
Fisher Fury was 2000 Zetec - now a 1600 (it Lives again  and goes zoom)
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Wadders
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| posted on 12/10/13 at 04:47 PM |
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You don't need any flow rate for a system boiler, your getting confused with combi boilers. 
Guess you are thinking of fitting a 300 litre unvented cylinder in the loft. If so pipe it in 22mm from the stop tap and you will be fine.
Al.
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adam1985
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| posted on 12/10/13 at 05:02 PM |
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http://www.range-cylinders.co.uk/pdfs/technical/tribunehe.pdf
Page 3 "water supply"
This should answer your question. It will be pretty much the same for all makes.
You can fit a unvented if you have less flow rate but then you will get less coming out as hot water, so you would loose out on the benefits of
unvented. in which case you would be better going for a combi with stored water something like a vaillant 937
[Edited on 12/10/13 by adam1985]
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