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head

A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste, respectively. Some very simple animals may not have a head, but many bilaterally symmetric forms do, regardless of size.
Heads develop in animals by an evolutionary trend known as cephalization. In bilaterally symmetrical animals, nervous tissues concentrate at the anterior region, forming structures responsible for information processing. Through biological evolution, sense organs and feeding structures also concentrate into the anterior region; these collectively form the head.

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  1. G

    Edwardian tap head - internal spline worn. Advice please

    I have an original Edwardian bath with a tap mixer in the wall. Until recently this all functioned perfectly. Recently though the cold tap has started to slip on the valve spline. By swapping the cold and hot tap heads I know it is the cold tap internal spline that is worn. I don't want to...
  2. Joshua

    Plumbing science question about meters head and bar

    First I'll give my understanding on how I think it works, haha bear with me people. Say if I had a simple combination system and I wanted to make sure the boiler can heat my radiators across a flat that has an area of 50m2. The height of the flat is about 10m high. Would about 1-1.5 bar suffice...
  3. Inverness

    advise on flow and return points unvented cylinder compared to the height of the header tank

    Hi guys, before I go ahead and install a indirect cylinder. The problem is in the loft where the flow and return points on the cylinder are similar height less than 0.1 bar to the header tank. I'm worried about there might not be enough head from the top of header tank to the flow going into...
    • Inverness
    • Thread
    • advise cylinder flow flow and return head header header tank height points return tank unvented unvented cylinder
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  4. C

    Help with Rio Mixer Shower Head Removal

    Im trying to service the Cartridge on my Bristan Rio Mixer, and I’m stuck! The instructions from Bristan don’t make sense when compared to the unit. I’ve taken off the tap head part from the thermostat control. I can’t find any grub screw under any where to expose the Cartridge. Might it be...
  5. D

    CANNOT REMOVE TAP HANDLE HEAD (BONNET TYPE)

    Hi! In the past I have simply removed the cover and centre screw and lifted off the tap handle head to change the washer/mechanism. BUT the one in my flat simply won`t budge!!!. I have removed the top cover and centre screw. I have even bought a TAP HANDLE PULLER ..still no joy it`s as solid as...
  6. T

    Circulation pump head and base opp direction

    hi, Just about to fit my welo replacement pump and realised the head and base have conflicting arrows? What one is correct? It’s not a new erp, it’s and old style If makes any difference. Appreciate any help, thanks!
  7. M

    Drain valve head has come off?

    I've been off supply for water for a couple of days due to very bad weather. It's starting to thaw out now but ice forced out one of the valve heads. Is this a drain valve in the picture? Is it OK just to push it back in or would I need a plumber? There's also a ring on the floor which fits it...
  8. J

    Need new TRV head unit

    Hi all, I have just moved into a new house and it looks like the previous owner has taken all of the TRV head units with them. I'm trying to get new ones, but the valves appear to have threads. Is anyone able to help me identify these (see attached)? Thanks! Jamie
  9. T

    Cross head tap removal....

    afternoon all, anyone come across these taps? Need to change a cartridge and can’t work out how heads come off! Tried the obvious pulling etc, on a Belfast sink so can’t get to the back to fit new taps..... Cheers all
  10. E

    Trying to get my head around the cause of three cold radiators.

    Hi all. I have three radiators in my house that are not warming up at all, the other radiators are hot. All the valves (they aren't thermostatic) are open on the three cold rads, and each have in-pipes that are hot to the touch, but the radiators themselves are uniformly cold. Bleeding the...
  11. M

    Shower just gives boiling water

    So I have a mixertap/shower. The tap works great, but when I change it to come out of the shower it just comes out boiling hot, regardless of how much I fiddle about with the hot/cold water taps. The strange thing is that if I remove the shower head the water that comes out from the shower...
  12. A

    Baxi has me scratching my head

    HI, I'm looking for some advice from someone who may have encountered my problem before. I'm a gas engineer and i have been trying to solve an issue with a baxi duo-tec 28 HE. The boiler randomly calls for CH when the thermostat is not, the green LED lights up for around 5 minutes before...
  13. D

    Fixed Head Shower Plumbing

    I have a low pressure system with 2 x 22mm pipes going from the loft tank and HWC to the full flow bath mixer/shower taps. The bath taps head is 0.25 bar. The flow rate at the bath with both taps on is 32l/min. The bath mixer/shower tap has 2 x 5mm diameter holes within the diverter that feeds a...
  14. J

    A standard problem. Plastic bath leaking from over head shower.

    Hi. I live in east London.... Require a plumber who has experience with sorting out the age old problem of the plastic bath not sealing due to movement. On inspection, I can see it was installed with 4 legs, but no centre base support. I also cannot see any batten running along the wall. The...
  15. Captain.rick

    Highest head macerator

    Hi guys/girls In case any of you guys don't know I'm pretty much just a gas man.. so I'm not too clued up of all aspects of plumbing. The question I have is what is the highest pump head selling macerator? I kind of need one on my own house as it will probably be the cheapest and quickest...
  16. S

    Head scratching moment.

    Hi all, On my current job (plumbing ,CH/HW) for a loft conversion on a first floor maisonette. I was planning on adding a water accumalator to improve pressure and flow rate. which is looking like a no go due to cost. I think the route we are going to take is to increase the water main size...
  17. S

    Salamander negative head pump

    Hi all hope some one can help, i have fitted a tee a salamander negative head pump to a customers house about 3 years ago, it ran fine untill the last 3 months but now after every shower the second error light comes on, I have fitted a new pressure vessel and it already has a salamander flange...
  18. R

    Shower Head Blocked. How to disassemble?

    Hi. My shower head as got blocked up with limescale. I've poked pins in all the holes, soaked it in vinegar, painted it with Kilrock etc and still sections do not produce water. Is it possible to disassemble this (and get it back together!); Any clues as to how to take this apart? (Or who...
  19. T

    Dishwasher connection. No space. Head ache.

    Hi all. I'm putting a new kitchen in my flat and being an old Georgian building nothing is square or level. I measured the kitchen but obviously didn't allow enough tolerance as my dishwasher is super tight. The dish washer measures 600mm wide and 550deep. My void for it is 600mm (so ok)...
  20. 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...

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