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Old boiler advice - replace or not
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You would hope that a RGI would understand pressure & flow.0
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fred246 said:You would hope that a RGI would understand pressure & flow.I'm only here while I wait for Corrie to start.
You get no BS from me & if I think you are wrong I WILL tell you.0 -
Adding some restrictions will reduce flow from the maximum of 176 litres per minute. Avoids admitting you are wrong.0
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Surely a Megaflo's output is only as good as its supply? And I've yet to see a household's cold mains supply approaching 119 lpm, let alone 176 - so that's all rather academic.Chaser's cold supply is seemingly at around 3bar pressure, and presumably - it would be quite typical, after all - at around 20 lpm flow. That would make his max hot water flow also ~20lpm. Now visualise what'll happen to his top-floor shower (presumably drawing around 15lpm at full chat) when a second shower - which is closer to the Mega and also drawing 15lpm - is used?If this is what's happening to Chaser - and I suspect it is - then it's surely 'normal' and not a fault?The only ways he can resolve it - afaIk - are:(a) improve his colds mains supply if that's possible (eg new supply pipe, sorting any internal issues (blocked stopcock, pipes too narrow, stuff like that). This might not be possible - ~20lpm might be the most he can get from the mains.(b) add a mains booster accumulator. This will work. He might even get away without a pumped system since he has a decent 3bar available to pressurise it.(c) Throttle back the lower showers so they provide around, say, 12lpm max. That would be an improvement - everyone should now be able to have their showers, but it's not ideal as the 'throttled' showers won't be as invigorating as they could be.1
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Megaflo's bumf states maximum flow of 76 L/min; sounds like google put a 1 in front0
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