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instantaneous

In physics and the philosophy of science, instant refers to an infinitesimal interval in time, whose passage is instantaneous. In ordinary speech, an instant has been defined as "a point or very short space of time," a notion deriving from its etymological source, the Latin verb instare, from in- + stare ('to stand'), meaning 'to stand upon or near.'The continuous nature of time and its infinite divisibility was addressed by Aristotle in his Physics, where he wrote on Zeno's paradoxes. The philosopher and mathematician Bertrand Russell was still seeking to define the exact nature of an instant thousands of years later.In physics, a theoretical lower-bound unit of time called the Planck time has been proposed, that being the time required for light to travel a distance of 1 Planck length. The Planck time is theorized to be the smallest time measurement that will ever be possible, roughly 10−43 seconds. Within the framework of the laws of physics as they are understood their lifetime, for times less than two Planck time apart, one can neither measure nor detect any change. It is therefore physically impossible, with current technology, to determine if any action exists that causes a reaction in "an instant", rather than reoccurring after an interval of time too short to observe or measure.
As of October 2020, the smallest time interval certify in regulated measurements is on the order of 397 zeptoseconds (397 × 10−21 seconds).

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  1. M

    Instantaneous under sink heater monoblock tap

    Does any one know why electric instantaneous under sink heaters are not permitted to me fit to monoblock taps? At least the Hyco ones say not to.
    • Matt0029
    • Thread
    • america heater instantaneous monoblock sink tap under usa
    • Replies: 6
    • Forum: USA
  2. M

    Instantaneous hot water heater

    How do these compare to the 5/10 litre storage under sink heaters?
    • Matt0029
    • Thread
    • america heater hot hot water instantaneous usa water water heater
    • Replies: 13
    • Forum: USA
  3. D

    Instantaneous Water Heater advice

    I would like some advice on an Instantaneous Water Heater that can provide hot water for a bathroom sink and a kitchen sink (1 heater, 2 appliances). The hot water pipe length from the heater to each appliance is roughly 2 metres. This will be for a small outbuilding and so the bathroom sink...
  4. G

    undersink water heater recommendation

    i have to specify water heaters for charity-run community hall with infrequent use, about 15 hours a week. they want undersink heaters for the two cloakrooms. will be two basins in one, and a basin and sink in the other. looked at Redring instaneous 9.5kw (they have 3 phase) or ariston 3kw 15l...
  5. F

    Baxi Duo-Tec GA40 pre heat and settings?

    The new Baxi Duo-tec 40GA has the factory default parameter setting to 00, being "instantaneous appliance" ie. the setting 03 "instantaneous appliance with pre-heat function" is not the default. Given the preheat is marketed as an advantage, why is it not the default? The installation I am...
  6. V

    Thermostatic mixing valve on an electric instantaneous water heater

    Any one have any experience on installing a thermostatic mixing valve on an electric instantaneous water heater for a basin ? My concern is that electric instantaneous water heaters generally heat water above a comfortable temperature and then can not deal with the demand and go cold until you...
    • VWUK
    • Thread
    • basin cold electric heater heating hot instantaneous mixing mixing valve thermostat thermostatic valve water water heater
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  7. S

    Smaller hot water tank or two under sink instantaneous water heaters?

    I own a two bedroom holiday let wooden lodge. The bathroom has a very strange two third length bath with a step in it and an overhead Mira Sport power shower. There is a large 115 litre hot water cylinder with two immersion heater elements (one is for "boost" purposes) in a cupboard serving the...
  8. M

    Small capacity gravity-fed instantaneous water heater...

    Recommendations please? TIA!
  9. P

    instantaneous unvented water heater(electric)

    Hi guys quick question really. I have a customer looking to have a instantaneous water heater(electric) fitted to supply a basin & sink in a bungalow and just wondered if there was any good manufacturers/models to look for? Cheers Pooly
  10. S

    Need advice on inline instantaneous water heaters

    Hi, We are having our ancient gas boiler removed & I want to fit inline instantaneous water heaters in the upstairs bathroom (serving bath & basin - not simultaneously) & downstairs kitchen (serving sink & washing machine, again not simultaneously). I'm confused by the dizzying array of...
    • snowcat
    • Thread
    • advice cylinder electric enough heaters inline instantaneous need advice water
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  11. N

    Instantaneous Water Heaters - multiple parallel installation

    I have a very small property in Cornwall with electricity only. The old fortic hot water tank will have to go soon. Does anyone have experience of installing multiple instantaneous electric water heaters in parallel or even in series? The Heatrae Sadia Multipoint installation manual shows how to...
    • Nigel Allinson
    • Thread
    • direct electric heaters installation instantaneous multiple phase unvented water
    • Replies: 16
    • Forum: Plumbing Jobs | The Job-board
  12. M

    Instantaneous elec water heater for bathroom

    Afternoon gents, anyone fit anything like this ? I bet they're not that good as far as flow rate is concerned ?
  13. M

    Electric water heater recommendations please - either instantaneous or storage

    I've got to go and look at a salon of some sort that needs hot water to a sink. The guy is very vague - it's his daughter's shop. From what I have been able to piece together she's either a hairdresser or beautician. Just one sink in the shop, and another in the kitchen area. No gas, so it's...
    • Masood
    • Thread
    • either electric heater instantaneous please storage water water heater
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  14. J

    instantaneous water heater advice

    I have been recently working on a Chaff 2T water heater and have replaced both diaphram and gas section and this still hasn't solved the problem of casing getting really hot and flames really high and yellow, I have also replaced case seals and merchant guarentees me that gas section set up for...
    • jimmy t
    • Thread
    • advice appliance heater instantaneous natural pressure seals water water heater
    • Replies: 13
    • Forum: Plumbing Jobs | The Job-board
  15. T

    Stiebel eltron dhf12c1 13.2kw instantaneous water heater

    Does anyone have any experience of installing Stiebel appliances in the UK? They seem to be pretty standard for hot water in Germany (i heard the word "gas" brings them bad memories) 13.2kW is as high as i can find on single phase... anyone know any different? Alternatively has anyone tried...
  16. T

    Pressurised tank + instantaneous water heater?

    Is it possible to use some kind of pressurised tank in conjunction with an instantaneous water heater in order to improve hot water temperature in winter, by raising the cold mains temperature to room temperature? I'm looking at options on hot water for a small flat conversion. Working to small...
  17. cr0ft

    Instantaneous Electric Water Heaters & Thermostatic Taps

    Hi all, Does anyone know of a high power (9 or 12KW) instantanteous water heater than can be used with a separate thermostatic mixer tap? I'm installing how water in a hospital lab and they want to avoid stored hot water if possible but all the systems I see won't work properly with a...
  18. A

    instantaneous electric shower with booster pump OR pumped electric shower ?

    Hi all, back againg looking for a little more advice pleses, i have very unreliable water presure sometims its ok and other times it simply not enough to allow my electric shower to work, i was about to install a Pumped electric shower and its own 25 gallon cold water tank to sort out my problem...
    • andrew1
    • Thread
    • booster electric electric shower instantaneous option pump pumped shower triton
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  19. M

    Instantaneous water heaters

    Hey chaps, have any of you fitted these for some clients? I am looking to install one for a Client. It needs to supply a double sink and a basin. Am not sure which make to look for really. I am installing for them a vailliant 838 and am wondering if i should just go with a vailliant water...
  20. T

    hot water heater

    I'm looking for a hot water heater that will have the power too run two hair dressers sinks and a small hand sink. its for a mate the shop is in a shopping center (no gas supply). there is one there now but they said its too small as they cant regulate the hot water from it. keeps going hot...
    • tiling spread
    • Thread
    • heater hot hot water instantaneous litre unvented water water heater
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
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