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How to sell a boiler II

Discussion in 'Plumbing and Central Heating' started by vulcancontinental, 6 Jun 2017.

  1. Dan Robinson

    Dan Robinson

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    Turn into a session did it? :LOL:
     
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  3. bernardgreen

    bernardgreen

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    I described the method used to measure the efficiency of a boiler with the comment that for a few seconds after a hot water tap was turned on the measured efficiency is 0%

    Dan Robinson's reply was

    Dan, would you be able to explain why that test method and/or the period of zero efficiency can be described as nonsense.
     
  4. Dan Robinson

    Dan Robinson

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    I'm saying your test is nonsense.

    You figure out why.
     
  5. bernardgreen

    bernardgreen

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    Not my test,

    You make the accusation that it is nonsense yet you will not ( or cannot ) support that accusation.

    A similar test but with less accurate results can be performed without any test equipment. Hold the DHW pipe at the boiler and ask someone to turn on a hot water tap. When the boiler fires up start counting seconds until the DHW pipe feels slightly warm. Remove hand from pipe.
     
  6. dilalio

    dilalio

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    BG: we ALL know you hate combi's, we're over it! Why can't you be? :sick:
     
  7. dilalio

    dilalio

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    It was meant as a quip about faking results but if it missed the mark, I'll have to work on my stand up routine :sick:
    And, yes got home all good thanks... you get any call-outs?
     
  8. dilalio

    dilalio

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    Not on a school night Dan! Got to grout a bathroom this morning, then second fix... yay! :cry:
     
  9. bernardgreen

    bernardgreen

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    I don't hate combi boilers. They have a place in very small houses and flats where there is no space for a hot water cylinder. After all they were originally designed for just that application.

    What I object to is "heating engineers" recommending a combi boiler be installed when when a conventional boiler would be more efficient given the life style of the people and the building.
     
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  11. dilalio

    dilalio

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    They've come on a bit since then.
    I have one, there are 5 of us, my house isn't very small, and I am in the trade - it performs just fine.
     
  12. bernardgreen

    bernardgreen

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    But they are still a combination of a high kW output hot water heater and a much lower kW central heating boiler. The design of combustion chambers and heat exchangers has improved but the extent of improvement is limited by the restraints imposed by the need to make a boiler at a price at which it can be sold. Hence there will always be a compromise between what is physically possible and what is commercially viable.

    Altering the geometry of the burner and heat sink assembly between high kW and low kW operation would increase efficiency but would it be commercially unviable in the domestic market.
     
  13. Dan Robinson

    Dan Robinson

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    And what exactly is it going to achieve? Certainly not a measure of efficiency worth a jot.

    And what we object to are pompous DIY'ers with very limited experience pontificating about something they know little about.
     
    Last edited: 8 Jun 2017
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  14. Terry lambert

    Terry lambert

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    Prepare to get deleted :LOL::LOL:
     
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  15. bernardgreen

    bernardgreen

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    Don't worry, No Intergas boiler was involved in the tests. You seem to be saying that accurate measurements of efficiency that produce genuine results are not worth a jot if they suggest the overall efficiency is or may be lower than the "value" used by marketing people.

    Maybe limited experience but not zero experience. Working on systems for monitoring the operation of industrial heating equipment requires a good knowledge how boilers work.
     
  16. D_Hailsham

    D_Hailsham

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    Oh dear, indeed! I suggest you have another look at the manual - here's the relevant info:
    Oh dear, indeed! You have been looking at the wrong manual - I have an OV boiler, not a system. Here is the relevant info from the Installation Manual:

    (Don't know how the 2.7 got highlighted)

    Remeha.png
     
  17. Dan Robinson

    Dan Robinson

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    Boiler manufacturer is irrelevant.

    No you doughnut. I'm saying your test will be meaningless.

    Some one as proficient at googling should be a able to find the discussions that have already been had on this topic on this very forum.
     
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