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necessary

A need is something that is necessary for an organism to live a healthy life. Needs are distinguished from wants. In the case of a need, a deficiency causes a clear adverse outcome: a dysfunction or death. In other words, a need is something required for a safe, stable and healthy life (e.g. air, water, food, land, shelter) while a want is a desire, wish or aspiration. When needs or wants are backed by purchasing power, they have the potential to become economic demands.
Basic needs such as air, water, food and protection from environmental dangers are necessary for an organism to live. In addition to basic needs, humans also have needs of a social or societal nature such as the human need to socialise or belong to a family unit or group. Needs can be objective and physical, such as the need for food, or psychical and subjective, such as the need for self-esteem.
Needs and wants are a matter of interest in, and form a common substrate for, the fields of philosophy, biology, psychology, social science, economics, marketing and politics.

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  1. B

    Is a digital shower necessary

    Just moved into a place with a really weak shower. The boiler is two or three years old - Viessman Vitodens 100. I assumed it was a combi boiler (in these turbulent times we had to put an offer on the house after one short viewing) but it feeds a hot water tank upstairs, it's run on a Potterton...
  2. D

    Are support sleeves necessary for copper pipe compression fittings

    Hi, This must have been discussed in the past but with a quick search I couldn't find the answer I wanted. What is the view of using support sleeves inside copper pipes for compression joints. (The pipes in question are 28 mm and 35 mm diameter so I'd expect them to be pretty strong anyway.)...
  3. siricosm

    Is a flow switch really necessary?

    I am contemplating installing a heat bank type thermal store, with an external plate exchanger for DHW. The pump on the primary (tank) side of the plate exchanger is usually controlled by a flow switch on the DHW side. I am thinking to use a modulating pump (Grunfos apha2) and a thermal...
  4. B

    Non return valve necessary?

    Hi I’m in the process of redoing my bathroom and adding a exposed thermostatic shower mixer I have a Potterton Titanium 33 (ErP) Combi Boiler My question is do I need to add non return valves to the hot and cold feeds to the mixer ? If necessary what is the maximum distance from the mixer that...
  5. L

    Is a polythene membrane necessary between biscuit mix and floor boards?

    Hi! I am looking for some feedback regarding the use of a polythene membrane between my UFH in drymix and the CaberDek floor above. We have no such thing installed, is it essential? I have only seen it suggested once as a recommendation on a website. The floor is: 200mm celotex, osb, pipes...
  6. M

    Career advice please (move if necessary)

    Hello everyone. I'm hoping to become a commercial gas engineer. I'm time served and have yet to do my Gas Safe. I have to save money myself in order to do the course. I want to do commercial gas and maybe in the future open my own business with the ability to carry out work on commercial...
  7. F

    Are isolating valves necessary on cw tank & HWC?

    We recently had a bathroom renovation and although we are pleased with the result there were a few problems along the way and the job cost twice as much as estimated. Our installer insisted we needed isolating gate valves adding to our cold water tank in the loft and to the Hot Water cylinder...
  8. M

    New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I worry?

    Can anyone tell me what this phrase means on an invoice? I've just had a new condensing boiler installed to replace a combi that was 21 years old. Is the work below enough? (The engineer said he was doing a powerflush - is that what this is? Or should I be worried?)...
  9. J

    Is a drain really necessary with a deck mounted showed head?

    I have deck mounted bath taps with a separate shower hose to install. The shower head comes with a drainage box which is mounted underneath the deck to re-route any water that runs down the hose into the waste. Is this essential?? Space is very limited and I may not even have space to drill all...
  10. U

    Necessary Quals to start my own plumbing business

    Hi, Looking to start my own plumbing business in the UK. Know the job very well through years of work but hold no qualifications as I have worked abroad. Would I need any qualifications to work on site? What sort of quals are required? And do constructions sites require you to be qualified as a...
  11. K

    How much training necessary before being able to work?

    Sorry if this is a basic question but I'm about to start level 1 plumbing. I intend to do level 2 and level 3 after that. Am I right in assuming after level 3 i can start to look for work?
  12. P

    Water Cooler Technician 20-26k Van / Phone Supplied - Immediate Start

    A wonderful opportunity had arisen in Premier Water Ltd, a leading water cooler company. We are seeking someone to join our team based in North West London to install and maintain our water coolers across London and the south east. Previous experience in a similar role would be an...
  13. S

    compression fittings on chrome pipe

    When I was training, my mentor told me that in order to get a proper seal with chrome pipe and compression fittings, it was necessary to remove the chrome plating at the end, in order to get the olive to "stick". What does everyone else do? I have always done this but have now been told that it...
  14. B

    CRB or DBS Check for Sole Trader

    Typical for the government to make something as simple as ensuring that no axe murderers or nutters or paedophiles work in our schools into a system you need a PhD in Rocket Science to navigate, I can make no sense of it. To me it seems to say that you can't DBS yourself, so what do you do as a...
  15. S

    Central heating clean necessary?

    Hi all, The central heating in my home is a vented system about 35 years old with a Potterton profile boiler which is about 17 years old. I have a magnaclean installed and its done a good job as the system water is clear. It is also filled with a couple of bottles of fernox f1. My question is...
  16. S

    Full re-plumb

    Good Morning All, Found this site on Google, so please forgive this first post. I have just purchased a property outside Salisbury, Wilts. I want a full re-plumb, including new boiler, rads/underfloor which will be done at the same time as the rewire. We will be adding bathrooms and replacing...
  17. S

    Necessary qualifications

    I'm just finishing my level 2 C & G qualification at college as a mature student. I'm confused about what I need to be able to sign off my own work. I thought that the NVQ was only needed for site work, what about other plumbing careers? My intention is to install integrated heating systems so I...
  18. T

    re-central heating installation.

    I plan to have installed a new heating system.baxi main 30 kw boiler,10 radiators+valves,wirelesss room stst/programmer,magna clean,new 3 metre length gas supply 22mm.The existing fire/back boiler,hot water cylinder needs de-commisioning also.The house is semi detatched,10 metres in length x 5...
  19. T

    safety valve on insert stove

    can anyone please tell me where i should install the safety valve on a insert stove as the stove will be totally inclosed i know that the valve needs to be as close to the boiler as possible many thanks
  20. R

    Is a S flange out of the HWC really necessary ?

    I am fitting an shower pump (Salamander ESP 100, negative head) under the HWC in a gravity fed system. I have run the pipework for the cold feed in, the cold out and the hot out, all in 22mm, as per spec. But before i do the hot supply in from the cylinder, i wanted to check what's recommended...
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