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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. R

    Baxi instant 105e Diverter valve repair

    Hi all, Quick question. I have a baxi 105e instant that has a Diverter valve issue. The bypass is allowing hot water around the bypass pipe and into the CH return pipe. I have looked at a rebuild kit and it seems that there are 2 listed. One is a cartridge type and the other more a kit. My...
  2. R

    Baxi 105e instant replacement

    Hi all. After some advice before I get some quotes. I have a 19 year old baxi 105e instant that needs replaced for something more efficient. I’m looking for suggestions for another baxi combi boiler that can be changed over with minimum work. My flue is side exit from the boiler (approx 1m to...
  3. B

    Insufficient water pressure for Trition 30i - Instant water heater

    Hello, I've had one of these plumbed and wired (3KW) in to my mothers house in order to add hot water to a sink with cold tap only (ex council 60') only to be told that the available water (to the Triton 30i instant hot water heater) is coming via the main water tank not mains pressure as...
  4. B

    Arezzo Instant boiling water tap - No hot water input

    Hi, I've bought an Arezzo Matt Black Instant Boiling Water Kitchen Tap (Includes Tap, Boiler + Filter) from Victorian Plumbing to install in my summer house which i'm converting into a bar. As there is only one cold water source coming into the building i thought the boiling water tap would...
  5. Bogart

    Instant hot water tap

    One of my daughters has been persuaded that she needs one of these instant hot water taps when she gets her kitchen done out. Oh dad is not too bad at £900. I replied by saying you can get a damned good kettle for £900. As she is on her own and out most of the day I do not see the point in...
  6. J

    BAXI Combi Instant 105e pressure

    Can anyone give me clear instructions for repressurising / topping up a BAXI Combi Instant 105e? Please see attached photo. Levers should be at top in case it appears rotated. It's not my boiler so am unsure. Thanks!
  7. R

    Rinnai B26 instant HW functions? temp sense or pressure drop?

    have a question for plumbers and or people in the know! I have a Rinnai B26 instant hot water unit that i had plumbed in line after a solar hot water storage tank. NOTE: the solar hot water part is a evacuated solar tube heater that circulates the water to a 135 litre ex gas storage cylinder...
  8. B

    heatslave 12/18 no instant hot water

    greenstar heatslave 12/18 oil combi boiler, 9 years old. when my boiler fires up first thing in the morning its been making a banging nose but it heats up the hot water ok and central heating works ok. the hot water is set to come on by the timer on the boiler on at 5.15am off 9.am. if i use a...
  9. B

    Dripping Grohe instant hit water tap -red duo

    Hi I have a Grohe instant hot water tap that is dripping, and the spring safety handle burst. Bought a new cartridge and handle and got a plumber to fit them but a) the spring for the safety handle still doesn’t work (plumber swears he fitted it properly) and b) it’s still dripping after...
  10. P

    Instant water heaters

    Hi, everyone. I have a shower in a bathroom that is about 100m pipe run from the boiler, and getting hot water to it without running the boiler stupid hot is a problem. Is there an instant water heater that I can install to feed the whole bathroom that is compatible with TMV's and the...
  11. C

    LPG instant hot water boiler advice

    Hi, I'm trying to setup a campsite and need to provide a shower and 2 or 3 sinks for the compost toilets and kitchen area. The field has a 1/2" water supply but no electric. I had thought of using a horse shower that runs off a LPG bottle but I'm guessing that will only cope with the shower...
  12. quality

    instant 105e .

    Hi folks I have a customer with the above boiler who is insistent on another BAXI . I'm not a BAXI man my self so what would you suggest TIA
  13. M

    Baxi combi instant 105e boiler problem - no hot water or central heating. Advice?

    Hi guys, new here and don't have much plumbing knowledge at all. I thought this was the best place I could ask what the issue could be before calling out an engineer. Okay, so basically I got up yesterday morning to zero hot water. It started running hot, then about 20 seconds later went...
  14. A

    Baxi 80 HE Instant combi hot water issues

    Hi all, I am sure i had previously posted regarding this boiler & issue with customer getting hot water for shower/taps, etc. Basically if they want a hot shower they have to turn on basin hot mixer tap full for couple of mins before steady hot flow occurs. They then turn on shower & it...
  15. P

    Instant water heater regs

    Hi everyone, I was wondering if anyone knows the regulations for fitting undercounter unvented water heaters?. I'm gsr but haven't got my ticket for unvented cylinders but I'm sure I've heard that the ticket isn't required for unvented appliances under a certain size. First time I have ever...
  16. D

    Instant hot water tap valve

    Hi Im a newbie in plumbing We had a new kitchen installed with a instant hot water tap with the boiler unit underneath the sink. Over past weeks ive noticed a valve that is dripping water down into the waste pipes. Most of times it gushing through and is noticeablely loud. The valve can be...
  17. J

    Baxi Instant 80HE not detecting water flow

    ** First of all, I am not Gas Safe approved, so I understand that there might be a limit to the help people offer ** Have have just renovated a house for my In-Laws and the last job (why did I put this off??) is the boiler. I am coming here as Baxi give me snippits of help, but keep refusing...
  18. S

    Baxi 105e instant diverter valve

    Hi gang. Is anyone familiar with these boilers? I have attended a job where there is no HOT water. The micro switch that is attached to the top part of the diverter valve is working, but the pin is not coming forward when a hot tap is opened. I changed the diaphragm but the old one...
  19. quality

    baxi instant 105e

    has anyone fitted an external EV to one of these as opposed to replace a failed original. My only concern is the these are not the average EV as part of it is used for the DHW preheat I believe. it would make my life so much easier if it possible as the boiler location and access is very poor...
  20. W

    Baxi instant 80 HE

    Been called out to this boiler,on way home, the customer has noticed the boiler firing up and going off,it's working no fault lights on, to me it looks like it's not modulating,I only gave it the once over,I'm going back tomorrow for a proper look,just looking for any heads ups,or pointers. did...
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