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Water (chemical formula H2O) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. "Water" is the name of the liquid state of H2O at standard conditions for temperature and pressure.
A number of natural states of water exist. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor.
Water covers approximately 70.9% of the Earth's surface, mostly in seas and oceans. Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea.
Water plays an important role in the world economy. Approximately 70% of the freshwater used by humans goes to agriculture. Fishing in salt and fresh water bodies is a major source of food for many parts of the world. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating, in industry and homes. Water is an excellent solvent for a wide variety of substances both mineral and organic; as such it is widely used in industrial processes, and in cooking and washing. Water, ice and snow are also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, diving, ice skating and skiing.

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  1. I

    New Vaillant EcoTec 836, slight leak underneath, what is this connector for?

    Got a replacement combination boiler, less that 1 year old. Noticed some water from the connection pictured. Can't see what is it from the manuals, possibly a rainwater drain? Was told by the person from Vaillant that it was an A A V (auto air vent), but she didn't sound too certain! Can...
  2. B

    Hot Water For Bathing Ideas

    I live in an apartment with a cold water tank. The cold water tank feeds the cold water tap in the sink and the bath. Recently, I refurbished my bathroom, and according to the plumber who fitted the new taps, high-pressure taps were fitted. Consequently, the water from taps is of a low volume...
  3. H

    UK Water heating hammering

    Hello, I've just found this forum and wondering if anyone can please help us. We've not long moved into our new home. It's has Johnson and Starley warm air heating and hot water tank in airing cupboard. All has been working fine until yesterday. We had the water softener serviced and since then...
  4. A

    Water Supply from Washing Machine Feed

    We have a utility room with a washing machine but no sink. Wife wants sink. There is room to fit one and the waste will connect to wahing machine waste but the problem is in the water supply. Currently there is only hot and cold washing machine hose fitting isolators attached to very short...
  5. userrrr

    URGENT Water keeps filling from output valve

    Water keeps filling up my home water tank from the output valve at the bottom of the tank and not from the top of the tank Water keeps pouring in from the output valve and won't stop, making the tank overflow 24/24 At first we thought it was the input valve at the top but after inspection we...
  6. E

    Loss of Hot Water Pressure to Shower

    Looking for any ideas to help. I've a Heatrae Sadia Hot Water tank, heated through Oil fired boiler (working fine). A week ago I reset the air gap as I was having dripping from the pressure relief valve. Since then I've lost a lot of pressure from the hot water feed to my shower. The rest of...
  7. N

    Is it possible to not have a b allcock in a cold water header tank?

    For reasons that I won't go into. Is it possible to control the water flow to a cold water header tank without having a ballcock in the header tank? ie to place some sort of control elsewhere in the feed pipe before the water gets to the header tank - turning off the mains water supply would...
  8. T

    Hot water flow/pressure

    I recently had an eco tec plus 836 combi installed as part of an oil to gas conversion. One thing I can’t work out is why the bathroom sink hot water flow is 12-13L per minute with at 44c and even hotter. However the nearby bath freestanding tap is 8-9L per minute at this temp. Both taps...
  9. K

    Understanding heating/water tank system

    Hi, We moved into a new property yesterday and are a little baffled by the heating/water tank situation. The previous owners unhelpfully left any kind of instructions/manual and therefore trying to figure out ourselves. We have what looks like a boiler/water tank system (coming from a standard...
  10. L

    Washing Machine Dirty Water Smell

    Hi, We have noticed for a while now that when our washing machine nears the end of a cycle we get a bad smell of dirty water in the downstairs toilet which is next door. We have moved the washing machine as we are having floor tiles put down and have noticed that the waste pipe is full of dark...
  11. P

    Milky hot water. Recently had a Viessmann 100-W combi boiler installed. Now when the hot water reaches any tap it is very 'milky'. This appears to be

    Milky hot water. Recently had a Viessmann 100-W combi boiler installed. Now when the hot water reaches any tap it is very 'milky'. This appears to be micro bubbles and clears, upwards, in a few seconds leaving no residue. Though this is a hard water area in 45 years have never had this cloudy...
  12. H

    How to blank off this water pipe?

    I need to cap off a water connection which is the water pipe connector to an M15 hose pipe from a kitchen sprayer tap. I have included images so you can understand my problem. Can anyone tell me the best way to blank off that pipe. (That's the vertical brass pipe in the photos)
  13. S

    No hot water in bathroom.

    The Water Board have just replaced the main water supply to our property. We have a ground floor combi boiler. The central heating system for the whole house is working as normal. Hot water is working as normal on the ground floor. However, there is no hot water to the first floor bathroom. This...
  14. T

    Turning Water Off When Going Away

    I recently read a post / comment whereby there was a recommendation that if you are away from your home more than 24 hours, then you should turn the water off to avoid potential catastrophic damage. When I go away I have always tended to turn ours off, that's typically anything from a couple of...
  15. S

    Intermittent low hot water flow all taps

    Hello All, I wonder if you can help me? I have intermittent hot water low flow from all taps in my 4 bedroom house upstairs and downstairs. I can sometimes recover the usual water pressure by turning the hot and cold water taps on and off which seems very strange to me. There is no problem...
  16. J

    Pump problems

    Hi there, I’m hoping someone can help me with this problem please. I’ve searched for similar posts but not found anything helpful! My mum’s house has a pump which pulses on and off every time a tap is opened. Even filling the bath (pressure is strong) the pump won’t come on and stay on but...
  17. M

    Bubbling hot water going to header tank

    Hi, I am looking for a bit of advice. Our Gledhill hot water tank was installed incorrectly 18 months ago and has been sending bubbling hot water to our plastic header tank in the loft every time we turned the heating on. We first noticed an issue with a leak in our bedroom ceiling which we...
  18. G

    Water level drops in pan after an hour…

    Hey Guys I’ve noticed this weekend that my en-suite toilet pan water level is seeming to regress after an hour. Toilet flushes as normal and water levels are all fine in the cistern. If I flush the toilet and wait all looks fine. However after an hour the water levels have dropped by a couple...
  19. M

    Water hammer advice?? (I’ve checked old posts)

    Hi all. Just had a neighbour knock the door regarding a water hammer issue. My own house developed this issue sometime last year as well which is when the neighbours roughly started. Severn Trent were doing bits and bobs out in the street back then but this is probably a coincidence. Our water...
  20. surfsup

    Outside tap lost pressure since cold snap

    My outside tap has had really low pressure after the cold weather a few weeks ago. Its connected from under the kitchen sink, and can be isolated from turning a flat head screw type thing a quarter turn. Any help or advice would be much appreciated!
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