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Utter bell end agas. Have a word with yourself

Just to round off this discussion I thought I'd give an update. We decided on a combi in the end which was fitted today and so far so good! Happy with flow rates and temperatures etc and it's what I wanted. Feels good to have the space back from the cylinder! Also the boiler that was...

Thank you very much to everyone that provided useful replies... Much appreciated

If the shower I want has these requirements can I just check maths with you for combi sizing! Assuming incoming mains @ 10 degrees 8l/60s x 42 degree rise x 4.2 joule = 23.52 (24kw) 10l/60s x 42 x 4.2 joule = 29.4 (30kw) In colder temperature i.e incoming @ 2 degrees 8l/60s x 50 degree rise...

Jesus you boys are unbelievable! Is this day to day "plumber" stuff or is this specific to heating? Or both? I had no idea it was so involved! How often are you calculating this stuff or is it a case of time served knowledge in this situation you need a b c and pipes of d e and f?

Not that this applies to me but if your flow rate is say 20l/min and your mains shower was say 15l/min would that mean you had 5l/min left for another appliance to run simultaneously? Assuming the other appliance was cold only feed I.e washing machine electric shower etc. Would that situation...

I shall do just that Tony. I think I need to invest in a pressure gauge and flow cup and just measure some stuff under different conditions. Once I understand what changes affect what I'll be better off to start learning!

Interestingly I have a stop tap under my sink which is currently seized in a position. It may be that this is restricting the flow intentionally to the sink or it may be that it is fully open......it is currently Schroedinger's stop tap.......needs replacing either way!

And Tony if I understand you correctly the 3 bar is all fine well but if you open the tap it's no longer 3 bar as that pressure is not when the tap is open? So a tap earlier in the system being open would reduce considerably what's left I.e making it theoretically a new system with entirely...

I see, cheers guys. Is there a specific theory course you might recommend to help me? I find this fascinating as an area and I feel like I need to understand it. So if you remove all talk of boilers etc and just think of flow and physics.....if my outside tap is 18l/min at say 3 bar that will...

I understand some restrictions will increase pressure on a system but not flow am I right?

Hiya Quick basic one.... If you're measuring your flow rates and kitchen tap says say14l/min and outside tap says 18, is it valid to just use the highest number and assume some sort of restriction on the kitchen tap? Nothing else can increase flow to one specific tap without pumps etc can it...

Cheers mate that's really helpful

Muggles on that point? If only cold is open is that at 20? And if only hot is open that's also 20? Then as you open 1 slowly the other decreases until they match when fully open?

Ok cool thanks muggles. That's pretty slow but I don't know what I was expecting really! I'll measure them again now

If you've got an iPhone or android smart phone download an app called scannable. It's totally free and is amazing for doing this job. Much better than photo

Also if you were running a bath with both taps wide open would they combine to make 20l/min (or whatever it was after pipes valves etc) so 10 each?

And no muggles I understand I can't get more than that but wondered if it would be significantly less than 20 or more or less the same as 20

Yup cheers muggles. Going to go with the unvented and see how it is with new bathroom knowing there is that option if I'm not happy. I reckon I will be though. What finally killed the combi for me was thinking I have a little ensure and a main bathroom, I might as well lost the en suite shower...

Cheers mate, it's a triton excellente shower I want but can't find any numbers that mean anything to me!