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. 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...
  2. 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...
  3. 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...
  4. 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)
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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!
  13. N

    Unvented water heater

    Hi, I have an unvented water heater which for some reason every year causes me issues. At the end of 2023 I noticed that the pressure valve gauge was going up when the water tank was switched on. My local plumber came and re-pressured the expansion vessel as it was flat, afterwards we tested...
  14. G

    How to clear hot water air lock?

    I recently installed new hot and cold feeds to a new downstairs cloakroom. After refilling the system the hot taps were all dribbling, spluttering and showing signs of an air lock. I attached cold mains to a hot tap and left it running for 15 minutes, while opening up each hot tap. They all...
  15. D

    Slab leak question, can I run the water for short times?

    I have a hot water slab leak which is found behind my bathroom vanity. We heard the noise for a week but never saw any water. Just today we saw water starting to come up under the vanity. I found the leak, my question is is it ok to run the hot water just long enough to take a shower? Does it...
  16. R

    Bath/shower with no hot water

    Hello, We hade a problem with our hot water not working in one of our bathroom's (all other outlets were working) Therefore we got the Thermostatic Shower Valve changed and everything was working again. However a few days later, both hot and cold no longer works for the bath and the hot...
  17. I

    Underground hot water feed pipe.

    I've had a burst pipe under bathroom floor. Ive had it dug up and made safe with the affected pipe cut and end caps fitted. The pipes are cover with a plastic sheet and then screet on top. I called out my gas boiler cover to make a permanent repair. The company they sent out have said it is...
  18. TeddySam154

    Boiler has started leaking water urgent advice needed?

    Hi, I need some urgent advice. I've Just come home after going out for evening, to discover hallway floor and kitchen floor covered in water. On further inspection I discovered that water was coming from boiler cupboard. On looking in boiler cupboard I found boiler has started leaking water...
  19. B

    URGENT PLEASE HELP Hot Water Combi Boiler Advice

    PLUMBING ADVICE NEEDED Combi boiler in our house, downstairs water seems to be piping hot. Upstairs basin, bath and shower only ever seems to be lukewarm - so much so that no one even wants to bath as it never gets hot enough! Open to suggestions as to what it might be and if anyone can...
  20. angy101

    Water Pressure Shower

    Hi I moved into a property where the pressure is slightly low and they have this super duper shower but pressure is somewhat lacking. I have had water company out and they did do a check and they found the flow rate reduced but they mentioned about the inside stopcock/tap should be changed just...
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