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Existence is commonly held to be that which objectively persists independent of one's presence.
Ontology is the philosophical study of the nature of being, existence or reality in general, as well as of the basic categories of being and their relations. Traditionally listed as a part of the major branch of philosophy known as metaphysics, ontology deals with questions concerning what entities exist or can be said to exist, (for instance: "Does the stellar structure UDFj-39546284 exist?"), and how such entities can be grouped, related within a hierarchy, and subdivided according to similarities and differences.
Materialism holds that the only things that exist are matter and energy, that all things are composed of material, that all actions require energy, and that all phenomena (including consciousness) are the result of material interactions.
Life is a characteristic which distinguishes objects that have self-sustaining biological processes from those that do not—either because such functions have ceased (death), or else because they lack such functions and are classified as "inanimate".
In mathematics, existence is asserted by a quantifier, the existential quantifier, one of two quantifiers (the other being the universal quantifier). The properties of the existential quantifier are established by axioms.

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  1. TMHM

    Replacing Drayton 3/4 wire thermostat. New BG one does not work in existing system.

    Hi Folks. I am trying to replace a damaged 4 wire (L/N/E & Switched L) Drayton Invensys RTS1 Electronic Thermostat with a replacement BG WS4 Electronic version. As can be seen from the attached pictures, both have identical wiring diagrams, however the WS4 will not work in situ. If I connect...
  2. J murton

    Advice for adding a branch into my existing stack

    hello Would like some advise on how to connect a new toilet to my existing stack. I currently have one toilet upstairs but plan to run a new waste for a new downstairs toilet. I know I have more than enough space to run the waste but my question is what is the easiest way to put a new branch...
  3. T

    Re-using existing connection to a replacement Cylinder

    I'm renewing my old indirect cylinder with a like for like replacement (albeit with an additional shower take off point). I intend replacing the cold feed and boiler connections with new pipe as they are pretty easy to replace. My question is about reusing the existing hot water take off point...
  4. B

    Waste routing to existing SVP advice please!

    Hello everyone! We are looking to change bathroom layout in our new house, hoping to squeeze in an en suite alongside the main bathroom. Here is a plan of our ideal final layout: Our existing space is 332 by 260 cm. Our idea is to put up a ~30 cm stud wall (green) leaving a 120 by 260 cm en...
  5. A

    Replacing existing radiators.

    Hi, I'm considering replacing my existing radiators which are almost 40 years old. Firstly is it worth replacing my existing radiators with new ones? How much more effective are new radiators and how long are they expected to last. I've got old pipework and some old valves. They could do with...
  6. K

    Joining existing waste pipe

    im planning a separate shower cubicle and currently have my bath and basin joining into a 50mm waste pipe to the outside stack. Can I tee in my shower to the existing pipe. If not going to have to raise tray by 100mm due to joist layout.
  7. T

    Advice re: adding wireless thermostat to existing system

    Hi, I've just purchased a house, and think I need to add in a wireless thermostat to control the upstairs - and I'd like some advice please. Current setup: - Worcester 40CDI boiler - Horstmann h37xl programmer with 3 zones; downstairs UFH (wet), upstairs rads and hot water. - UFH has wired...
  8. D

    How to use existing oil boiler for UFH

    I'm renovating my house, taking out the wall mounted radiators and fitting an underfloor (in screed) heating system, but I want to keep the existing oil fired boiler. If the UFH needs water at 25c and the boiler delivers water at 60c how do I avoid over heating the floor? Can I fit a...
  9. G

    How can I replace 1/2" TRVs with existing 3/4" tails

    Hi I am a homeowner/DIYer albeit reasonably confident, so I may not be using right terminology etc, but here goes: I wonder if you can help! I want to replace my rad valves to the TRV type and locksheild, but I have a problem. The tails currently on my rads are the larger type (3/4")! the...
  10. P

    Installing Outside Tap to Existing Pipework

    I have some pipework at the back of my house which I'm told is for an Outside tap (see image). However I'm not sure what fitting is required to install a tap, the pipework looks to narrow for tap fittings available. Any help welcome.
  11. P

    Replace existing shower and shower door in Carlisle

    Hi, I have an existing exposed shower valve and riser which I need to have removed and replaced with a new exposed valve and riser. Also the shower door (across the shower cubicle access) needs to be replaced. I will procure all fitments, so labour only required. The job is in Carlisle, I...
  12. M

    How to install rigid shower riser on top of existing mixer

    Please see photo attached of existing mixer in bathtub (https://www.victorianplumbing.co.uk/lancaster-traditional-bath-shower-mixer-with-shower-kit) I'd like to install a rigid shower riser on top of it. See specifications below. I have also included a drawing showing the actual dimensions in...
  13. I

    Bought a new Range Cooker.

    Hi Guys, can anyone help. I've just purchased a new range free standing cooker, I invited a Gas Safe engineer to install it, he says its in breach of regulations, is this correct. The range is 1100mm, the opening the same, it appears the wall cupboards above are the problem, the distance between...
  14. king of pipes

    worcester bosch system boiler and 180litre Greenstore cylinder

    I am quoting on a job in a very nice property the problem I have is the boiler will be in a purpose built boiler room just off the utility room downstairs the existing boiler has a mono draught flue and if floor mounted , the cylinder will go in the same place as the existing which is central to...
  15. T

    Old osma pipe

    Could do with some advice from an old hand in plumbing! Basically, due to some leaks and poor installation in the first place, I need to replace some external pipework, leading from a kitchen sink to a soil stack. The problem I've got is all the existing pipework is Osma 40mm/ 1 1/2 inch...
  16. L

    Edmonton, London - Thermal Store replacement

    Need to replace the existing thermal store on a ground floor flat N18 postcode. Ideally looking to get HEATBANK Pandora.
  17. B

    Fitter refusing to connect gas hob as gas meter is too close to electric

    The title says it all really. I had a new replacement gas hob and boiler fitted to an existing installation by a local Gas Safe engineer. However the hob failed (ignition circuitry malfunctioned) and whirlpool who manufactured it arranged to warranty replace the whole thing (there were loads...
  18. J

    underfloor heating installation problem

    guys , can you assist , have had underfloor heating installed and it is becoming a nightmare as different people are involved ie underfloor people , electrician and plumber. i am far from happy with job and it is due for commissioning this week even though i have told both the plumber and ufh...
  19. A

    TRV Question

    Hi I am installing new radiators and changing the TRVs for more modern ones. My question is with respect to the original pipework there is a TRV 'body' in place which the old TRV fitted to. Should I change the TRV 'body' or just screw the new head onto the existing body. thanks in advance. AliG
  20. G

    Stuart turner pump ?

    Hi All A quick question I hope My sister wants to replace a built in shower with an electric one The house is a dormer bungalow it has a stuart turner twin head pump in the closet downstairs that kicks in when a tap is turned on The bathroom in question is upstairs Does she require a...

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