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Discuss I really need your help. Gas related (Heat inputs etc) in the Plumbing Forum area at

  1. Lee McCormack

    Lee McCormack New Member

    Hello everybody,

    This is my first post and as ive noticed a lot of people are very critical when people ask questions please have my assurance i have been studying for about a week and im simply trying to get ahead.

    I have been given a MI sample which is found on a boiler which reads the following

    Range rating . Min . Max
    Heat Input KW 16.3 19.1
    Heat Output KW 11.7 . 16.4KW
    Hot burner pressure mBar 7.4 . 5.2

    Im a little confused by it all even after looking up other posts what it means by heat input and heat out put etc.

    Am i correct in saying that the burner pressure is measured on the the outlet port of the gas valve and this checks the pressure of which the burner is operating at ?

    Regarding gas rate is this the same as heat Input ?

    Thankyou guys
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    simple way to look at it

    heat input simple way to look at this is the input of gas

    heat output how much heat is the boiler producing for the system

    burner pressure is normally tested on a port either p2 of the gas valve or on the burner tube (normally a test point on the tube going to the burners)

    and yes but will be in m3/h or ft3/h

    lets say you do your gas rate and you get 1.64m3/hr to turn this into a kw rating

    1.64 x 10.65 = 17.46kw

  3. chris watkins

    chris watkins Plumber

    Lee what are you trying to get ahead off ?
    Input is the amount of heat energy release when the boiler burns the fuel.
    Output is the amount given out to the water or air.
    This gives you an idea of how efficient it is.

    We can't answer the burner related questions as it is open forum.
    Edit - (Or maybe Shaun can)
    • Like Like x 1
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