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In mathematical analysis, the maxima and minima (the respective plurals of maximum and minimum) of a function, known collectively as extrema (the plural of extremum), are the largest and smallest value of the function, either within a given range (the local or relative extrema), or on the entire domain (the global or absolute extrema). Pierre de Fermat was one of the first mathematicians to propose a general technique, adequality, for finding the maxima and minima of functions.
As defined in set theory, the maximum and minimum of a set are the greatest and least elements in the set, respectively. Unbounded infinite sets, such as the set of real numbers, have no minimum or maximum.

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  1. P

    maximum heating ouput on a viessmann

    Does anyone know what this parameter on the newer viessmann 100-w (B1KF) range does ?
  2. V

    Megaflo- optimising temperature to get maximum efficiency

    Just wondering if anyone with experience of Megaflo systems could give any advice. Have a Megaflo system, indirectly heated via the boiler. Have Megaflo tank temperature set at the lowest recommended temperature which is 60 degrees (lower is possible but legionella risk rises). The question is...
  3. D

    UFH maximum temperature with LVT

    Hi everyone, we have a 1920s house with solid brick walls. The small front carpeted lounge (1.9 combined tog of underlay/carpet) with its own UFH circuit is struggling to get to 20 degrees. The UFH pipes run under about 5m of LVT to get to the front lounge. My question is, can I boost the...
  4. I

    heating not reaching maximum temp

    I have 23 year old potterton suprima 60 with a danfoss flowshare 2 diverting valve and new programmer. I am experiencing short boiler operation of a minute or so before shutting down and then starting up again ( hunting?) Boiler thermostat maximum also room stat maximum but rads only getting...
  5. O

    Rheem - maximum ignition attempt lockout

    Hi, I am getting a lockout due to “maximum number of ignition attempts”. When I power the unit off and on it seems to work fine but eventually later in the day the lockout occurs. One time I did watch it try to ignite and the igniter turned bright red but no ignition and then lockout code...
    • Oilers
    • Thread
    • ignition lockout maximum
    • Replies: 5
    • Forum: Ireland
  6. K

    what is the minimum and maximum gradients for 100mm (diameter) drains

    what is the minimum and maximum gradients for 100mm (diameter) drains
  7. H

    Mixer tap weaker flow when tap turned to maximum

    I have a kitchen mixer tap with one simple lever controlling temperature and flow. The street water was cut off for a few hours. After that, the hot water flow worked as before, but the cold water flow was very weak. With the tap set to cold, if I open the tap about half way, the flow is the...
    • hrxv1
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    • Forum: Canada
  8. L

    Hot water maximum distance??

    Hello everyone I'm new to the forum, I'm looking for some advice and piece of mind. I want to plumb a hot water tap to my kitchen (combi system). Unfortunately I've had the kitchen plastered and I've now decided i want to move the position of the sink, without seriously damaging the nice new...
  9. B

    Is there a maximum height for a F&E vent pipe

    Hi guys, My house is a new build and cannot believe that the plumbing was done by plumbers at all, it is a disaster. Have slowly been correcting bits over the last couple of years. The vent pipe was crooked over the tank about 10cm above the water level line. I seem to remember 450mm being...
  10. C

    Maximum deviation from horizontal before air lock?

    In a pumped radiator circuit, in long horizontal-ish stretches of pipework (say 15mm dia), what's the maximum typical rise/fall before air pockets become persistent (aren't moved on by pumped flow) and cause noise/gurgling, and before air locks prevent flow? Apologies if this is a common query...
  11. C

    Range rated boilers

    normally range rated boilers have a min,medium and max settings, so if I'm testing the heat kW input and burner pressure does the results have to be spot on one of these settings or does it just have to be within in the range of the min and max? Or do I have to do the test on maximum which would...
  12. S

    Maximum connections to 40 mm waste

    I just had a visit from Building Control. The BCO said that I had too many appliances going into a 40 mm waste pipe. I have looked up Part H of the Building Regs, but I do not see any specification of how many branches you can have on a 40 mm pipe. The BCO said I had to connect them all into a...
  13. S

    New Boiler - Maximum Temperature Issue?

    I've had a new Vaillant Ecotech Pro 28 fitted in a holiday let this week to replace a Ferrolli F30. All seemed wonderful - very quiet as I hoped. It's controlled by a Hive and after he installed it I set the temperature up high on the stat. The 'Hive' recorded temperature rose as expected but...
  14. M

    What is the maximum btu's that can be feed off 10mm pipe

    What is the maximum btu's that can be feed off 10mm pipe?
  15. S

    maximum number appliances off 22mm cold mail

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    • 22mm appliances cold first incoming maximum might number pressure showers
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  16. S

    Maximum pressure to toilet?

    I have a toilet which is filled via a 3 bar pump. It fills up very quickly. It is a couple of years old now and was working fine until recently. There was a slight leak that appeared where the flexible hose connected to the bottom of the plastic thread so I tightened it up a by half a turn and...
  17. B

    Oil tank maximum head

    Im quoting for a new boiler but noticed the tank outlet is about 4 metres above the pump. I cant find in my books anything to prescribe when to use a pressure reducer. Anyone have any guidance? Doesnt appear to be in the MI. Thanks
  18. T

    Creda thermostatic power shower not working

    Morning all, hoping someone can help. Moved into house about 2 years with the above shower installed - shower has worked beautifully since then until daughter recently visited and decided to turn up to maximum​:confused5:. Now shower won't turn on - gives one short burst of water then nothing...
    • Trish
    • Thread
    • cold heating hot maximum not working power power shower shower thermostat thermostatic working
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  19. M

    Maximum WC's on a horizontal run?

    Just looking at the Part H building reg’s and table 2 - page 9 says that up to 8no W/C’s can be fitted to a horizontal branch from a soil stack and a max run of 15m, but diagram 3 – page 9 says that the maximum run for a single W/C branch is a maximum of 6m. Is this is due to the perceived...
  20. D

    Maximum water pressure?

    Hi guys, Can anyone tell me if there is a maximum cold water supply pressure for domestic and / or commercial premises please? We have an electric water heater below our works kitchen sink which is protected by a 6 Bar PRV. Having worked for years suddenly the PRV began 'venting to waste' so I...
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