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    New combi has lower pressure than old one....

    All sorted. He did a full assessment and spotted a split in in the shower hose. Bizarre really. Thanks for the help and advice I've learned a lot and will pass it on.
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    New combi has lower pressure than old one....

    Thanks. I've paid for the boiler so will try to get him to replace it with a Worcester 37. Is this a good boiler/strong shower? Will aim to pay him the difference between the two but no more. So project will still come in on budget (excepting the extra £150/200 difference between the...
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    New combi has lower pressure than old one....

    Sounds like the installation is only partly to blame and that I should have got a boiler with a higher flow rate. Disappointing, as the single criteria I mentioned was "must give me a good shower...."
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    New combi has lower pressure than old one....

    21.5 litres from the cold
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    New combi has lower pressure than old one....

    Ok - he's here now for a while to some cementing round the flue. He says the main coming into the house is 16mm and the valve he's fitted takes it to 11mm! Is he making sense? Also - measured the flow from the bathroom tap. I'm getting 7.8 litres in one minute. Input temperature is...
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    New combi has lower pressure than old one....

    We're probably in danger of talking too techie for me. The book says 9.8l/min - the old one was 9.4. Have I made an error in deducing that this would equate to similar/better shower pressure?
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    New combi has lower pressure than old one....

    Based on property size etc the 24 was the rec. boiler by Worcester. The 24 has the same flow rate as the scaled-up decade old combi so it's reasonable to expect a similar, or better, flow rate to the shower head. The 24 was chosen over the 27 as it fits the space exactly. Powerflush...
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    New combi has lower pressure than old one....

    Yes he's corgi. He needs to come back today to complete the guarantee card and fit a trv also he wants to tidy up and do something else.
  9. T

    New combi has lower pressure than old one....

    Fair point! How can I tell the difference between a full bore and a reducer? Are they marked? Thanks
  10. T

    New combi has lower pressure than old one....

    Yesterday had a new combi fitted (Worcester Greenstar 24i Junior). Shower pressure is unacceptably low and certainly lower than the old glow worm 75e boiler. Only change I can see is that because the fitter couldn't find the house stopcock he sliced the cold inlet to the boiler and put an...
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