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    Boiler options - Ideal, Worcester Bosch or Viessmann?

    Just had a quick look and the Intergas Rapid 32 is listed as 50dB, which is the same as the the Unica MAX S 20, so this is helpful. Thanks!
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    Boiler options - Ideal, Worcester Bosch or Viessmann?

    Yes, dB is a log scale, so 3dB is equal to doubling the sound intensity. However, apparently a 10dB increase is required for it to be perceived as twice as loud though... @vulcancontinental, sent you a PM. Thanks!
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    Boiler options - Ideal, Worcester Bosch or Viessmann?

    Thanks, I didn't think to look there! The Intergas HRE 18 SB is rated at 45dB, which is a fair bit lower than the 50dB for the Unica MAX S 20. Not sure how much different it would be in real world conditions though...
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    Boiler options - Ideal, Worcester Bosch or Viessmann?

    Apologies for hijacking Gizmo's thread but I'm in a similar situation and so thought it best to add a reply here rather than create an entirely new thread. Here's my current system: Baxi System 100 HE Plus 22kW boiler (just over 17 years old and on its last legs) Megaflo 170l unvented hot...
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