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demand

In economics, demand is the quantity of a good that consumers are willing and able to purchase at various prices during a given period of time. The relationship between price and quantity demand is also called the demand curve. Demand for a specific item is a function of an item's perceived necessity, price, perceived quality, convenience, available alternatives, purchasers' disposable income and tastes, and many other options.

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  1. M

    Confirmation needed!

    Hey all. im a plumbing and heating engineer that mainly deals with installs but my mother in-laws boiler is playing up. the heating is constantly on even tho the room stat is not calling for heat. i have come to the conclusion that its the diverter valve sticking as when i tap the valve it shuts...
  2. B

    flexicom goes to F1 afterapprox 2 hours, every time

    flexicom 24cx goes to F1 error and stops after 1hr 45 to 2hrs 15 every time without fail. Probe was v hot so changed, but still same problem. Will not restart till round an hour has elapsed. At start of 2 hours, accepts demand for hot water but later in the 2 hours, demand for hot water...
  3. R

    Can the combi boiler componentry draw air into a sealed system?

    I have a WB Greenstar 30 HE.It is 6 years old.I have 4 rads downstairs 2 0f which are new in the summer,upstairs i have 4 also.When the system is off the pressure is at 1 bar and has been all summer so have no pipe leaks.The AAV started leaking water at the end of last winter so have recently...
    • Ralphmalph
    • Thread
    • air boiler central heating system combi combi boiler demand expansion gurgling oil sealed sealed system system water
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  4. GQuigley67

    looking for a decent macerator

    pricing up a job at the moment, need a macerator which can take a WC and Basin, and be able to cope with a high demand as its in a lock in/studio kind of place a band is using and are planning on having concerts. Run is approx 14m. Ideally I would like the outlet to be 32mm but if its 22mm and...
  5. R

    Help,no hot water

    Hi everyone,ive jumped across from the sparkys forum,am in a bit of a flap.There was a southern water contractor doing works outside at 5pm,they knocked our door and asked if our water was on,which it was,couple of hours ago noticed that the hot water on our VAILLAINT ECOTEC PLUS combi(4 YEARS...
  6. A

    Halstead Finest Gold: boiler not firing on hot water demand

    My Halstead Finest Gold has no hot water. Turning on the hot water tap does not fire up the boiler. If the CH is on, turning on the hot water tap turns off the burner. The microswitch is being activated by the diaphragm. There's around 5V across the microswitch. Last year I cleaned out the...
    • andrewedmondson
    • Thread
    • boiler demand firing halstead hot hot water not firing oil water
    • Replies: 21
    • Forum: Plumbing Jobs | The Job-board
  7. J

    Rads constantly warm, heating switched off?!

    Hi all, after some advice as to what this problem could be... Boiler is a Valliant Ecotech combination boiler (approx 5-6 years old) located in the loft. Last weekend I drained the system out and turned the inlet on to flow some water through the rads, ran a cleaner through it and then...
    • jsr
    • Thread
    • boiler central heating system cold radiator constantly demand diverter hot rads switched turned warm
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  8. T

    Glow Worm 30 CXI radiators get hot with no demand and CH swithed off

    Any help would be very much appreciated Glow Worm 30 CXI central heating comes on with no demand from thermostat and even remains on when cenral heating is switched off - I have had to turn power off to stop it - No fault code displayed - also the radiators get warm when hot water is used when...
  9. A

    Y Plan System Wiring

    I have just booked myself on a Honeywell Wiring Course for £30 but need some help diagnosing a customer issue where Port A+B are open on a Honeywell 3 Port Mid Position Valve when there is a demand for either HW or CH or both. Is the valve stuck (looks pretty old) or is it a wiring issue. The...
  10. D

    Boiler keeps running - No demand from controls

    Hey guys, I've been trying to diagnose and fix a problem with a heating system and am pretty much out of ideas! It's a standard Y-Plan, Glowworm Flexicom 30sx condensing boiler (fitted in the summer) Drayton room stat (RTS1 newly replaced) Honeywell cylinder stat (L641A newly replaced) Danfoss...
  11. B

    new boiler but no on demand hot water

    hi guys this is my first post on here and was hoping someone may be able to give me some advice. i am a tennant and recently our gas operated back boiler was condemned after is failed its yearly landlords inspection. this was duly replaced with a combi style boiler in the airing cupboard and...
    • bobrick
    • Thread
    • boiler combi combi boiler control cylinder demand drayton eco gas hot hot water hot water supply new boiler oil potterton shower store supply system tank valve water
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  12. T

    Vaillant 630 on demand raidiator heating not working

    I have a Vailant 630 Boiler and its connected to both hot water cylinder and radiator. It seems to work sporadically but the hot water is always working properly, the radiators heat-up randomly and i can't work out a pattern when they are working. I need for them to work on demand as its...
    • tinjanurtle
    • Thread
    • boiler button central heating system cylinder demand hot hot water hot water cylinder mains manual not working power radiator radiators reset vaillant water wireless work working
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  13. W

    Worcester 24cdi RSF - Hot water demand

    Have narrowed down an intermittent problem thats occurred for months. When a shower is taken for say 10 mins, everything is fine. Wait 2 minutes & have another shower and things are USUALLY fine. However, if you wait say 15/20 minutes after the first person & then try getting hot water, the DHW...
    • warehouseman
    • Thread
    • air boiler cold cold water demand dhw diaphragm diverter valve filter flame hot hot water no hot water no water plug pressure problem shower switch taps valve water worcester
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  14. R

    Gas Engineer Demand?

    Hiya, I am new here and was wondering if I could kindly borrow your experience please? I am not trying to advertise in any way here, but just to work out if something is a possibility, so I will have to limit the details so I don't get accused of anything! I recently had a discussion with...
    • Rangemistress
    • Thread
    • 6129 appliance demand engineer free gas gas engineer head industry install installation job main plumbing power self-employed supply training travel van wide work
    • Replies: 22
    • Forum: Plumbing Jobs | The Job-board
  15. S

    Vokera Excell 80sp pilot goes out with any demand

    Hi could someone help Vokera excell 80sp. Pilot lights and is stable. As soon as there is a demand fan picks up to speed fan pressure differential switch clicks pilot goes out?? Take vacum hoses off pressure switch pilot stays on so the fan is not blowing pilot light but as soon as contact made...
    • symills
    • Thread
    • appliance boiler burner combi demand filter flame gas high inside metal pilot power pressure problem remove screw supply switch valve vokera water
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  16. L

    Advice on lowering oil boiler output to better match demand

    I Would appeciate a few thoughts on what I should do with the following situation. Recently moved into 400 year old house with 13 year old CH refit. Seems to be a good job but the Oil consumption is pretty high so I have been looking into the basics first before splashing out. Boilder is...
    • Lebowski
    • Thread
    • advice better boiler burner central costs demand high hot job oil oil boiler output paperwork radiators response running costs timer
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  17. E

    Hot water demand but no hot water...

    hi, I've a Vaillant ecoTech Plus 624 with a Drayton LP522 controller. CH control all works like a charm, but a couple of days ago the HW failed. The boiler shows a permanent "water demand" symbol in it's display. I literally can't get the thing to stop displaying it. The LP522 controller...
    • Emmster
    • Thread
    • boiler burner central heating system cylinder demand drayton eco error flow gas hot hot water lp522 mains no hot water overheat pump reset rules test vaillant valve water
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  18. S

    Solar Thermal - much demand?

    Sorry - guess I should have put this in the General forum, but I can't see how to move it.. Hi, Couple of Q's I'd like to put past you all: I'm just considering doing a Solar Thermal course; could I ask what sort of demand there is out there? I guess the customer needs quite a bit of...
    • sinkorswim
    • Thread
    • cheap demand general green install price sales solar tee thermal work
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  19. P

    Can it be done? is there the demand?

    A recurring theme but I need to find out before I commit. I have the offer of a generous redundancy package on offer and am fed up with being a corporate slave. I am considering retraining as a plumber so I can work for myself and be master of my own destiny. I have a long career in customer...
    • papillon_65
    • Thread
    • courses demand difficult heating high hose job manual nvq plumber plumbers plumbing skills trade work
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
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