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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. M

    No Heating or Hot water AlphaCD25C

    My partner has an Alpha CD25C fitted and worked until a couple of weeks ago. Intermittently it will switch off after working for 4-5 days. When checking the boiler lights A + B flashing red alternately and light D is green. Tried doing a reset and switching off the main power and restarting...
  2. V

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    Hi.. I would appreciate your advice. I am not get any cold water on the bathroom. Just dribbles in the bath and toilet..none at all on the wash basin. The supply is from the cold water tank. Thank you.
  3. A

    Hot water very slow new mains pipe fitted

    Hi all Just had a new mains water pipe fitted and the hot water is very slow almost a trickle. We have a combi vaillant ecotec pro 824 and it seems to come out fast to begin with then slows down considerably. It seems the boiler is struggling to provide hot water at the adequate rate that it...
  4. G

    Best economic way to heat hot water no heating

    Purchased property, all electric heating has combination cylinder doing hot water for 1 bathroom only , updating bathroom to have a shower, bath a basin and kitchen sink that needs hot water with no gas main or boiler , what’s the cheapest system to install to heat this property’s water...
  5. D

    URGENT Removal of internal water meter

    Hello.need a little help. I have a water meter under kitchen sink next to stop tap and a water meter outside under the pavement. Can I remove the meter under the kitchen sink?
  6. B

    Ever had Central Heating Water leak INTO Cylinder fresh water ?

    Hi, Vented system, F&E Tank etc. Cylinder about 10-12 years old. Just running some x800 through to try & improve radiator heat. (another story) Been in a couple of hours. Just run a bath & the water has a slightly odd brown'ish tint to it. never had before. does not smell. Is there anyway it...
  7. J

    RD532i Boiler over pressurising - on 3 bar - help!!

    Hiya - we noticed our boiler was on 0 bar so the gentleman who came to fit a smart meter said to repressurise it and not to leave it. I googled it and left it on the green triangle (while the boiler was not in use) The heating has come on this morning and we noticed it's at 3 bars but there's...
  8. A

    Rayburn 499k heating working but no hot water

    Hi all, just this morning seem to have a new problem to us with our Rayburn. Oven and central heating all operating as normal, however we have no hot water from any taps. We would normally hear the Rayburn kick in when hot water is demanded… however it is not. Any help hugely appreciated
  9. K

    Looking for answer to water heater sme

    At our wits end. Remodeled a farm house in 2020, installed the water heater and due to appliances being backordered couldn't move in until Nov. of that year. After a hot shower we noticed a terrible smell. We had the lines smoked, venting tested, used a camera on the lines, all from a local...
  10. B

    Surestop water switch.

    Hi all. Due to current location of the existing stop tap, I was thinking about installing a sure stop water switch as part of an upcoming kitchen refurb. Anyhoo, have come across a post where several people have suggested ripping them out. Are they really that bad? A sure stop would definitely...
  11. M

    Hot water solution for cafe??

    Hi guys. Do any of you knowledgable lot have any recommendations for hot water in a small cafe kitchen? They have a combi boiler which serves the property but she’s been having issues with it which then means she can’t open due to having no hot water? Any advice would be great.
  12. M

    Baxi Boiler - Water Not Getting Hot 1st thing in morning

    Our Baxi boiler works fine most of the time but the last few days it does not heat the water first thing in the morning and occasionally later on in the day too. It still works most of the time, e.g. for baths. The pressure is fine even when the water isn't heating. I've had a look online and...
  13. A

    Lukewarm water upstairs

    Hi, I am getting hot water in the kitchen when I turn the kitchen tap on. However the hot water in the upstairs bathroom for both bath and sink is only coming luke warm. I have an old Worcester combi boiler and the boiler ignites when I turn either of the upstairs hot taps on. The bath hot...
  14. M

    Water Heater Leaking from back of heater

    Hi we have an Ariston new europrisma 10 UR 3KW heater and it has started to leak from a hole that is covered with tape at the back of the heater. I have tried to find something that explains what this hole is but can't find anything. The heater has been in about 3-4 years and only started...
  15. A

    Please help. When Heating on no hot water and vice-versa

    We have a Drayton 27101 - 3 port motorised valve 22mm compression Issue: when heating switches on there is no hot water, when you switch heating off you get hot water. I replaced the motor in the motorised valve, everything started to work like it should. But an hour later and the same...
  16. G

    Different flow temperature for radiators and hot water tank circuits

    Hi Morning, I am looking at a new boiler and hot water cylinder setup for a house I am refurbishing and am getting conflicting advice on my question: Can I use a Combi or System boiler to have a different flow temperature for the hot water tank heater and the radiators. I appreciate the hw...
  17. M

    Mira Platinum water inlet

    About to install a new Mira Platinum on a gravity fed system. The Installation Manual shows the pipework from top of hot water tank coming off at 45 degrees. Can I just T off the existing horizontal hot water pipe at top of hot water tank or even from the vertical pipe going down the back of the...
  18. A

    Worcester rsf hot water cutting off

    Hi.i was asked to take a look at my customer worcester 28i. When calling for hot water the boiler fires up fine and the water gets hot. After approx 30secs of running hot water the boiler shuts down. With the hot tap still running( water gone cold) the boiler then fires up after about 5sec and...
  19. J

    Combi- hot water pressure

    Hi We have recently had a 35kw combi boiler installed in a 4 bed 2 bathroom property. Since the combi boiler was installed we are getting slow hot water pressure affected shower and bath I wouldn’t say it is trickling but it is not a good pressure where you feel clean. The bath takes longer...
  20. M

    Intergas HRE 30 SB - Hot Water colder after engineer visit

    Morning All. I hope you can help. We recently had a (mostly) successful visit by an Intergas engineer who fixed problems with our boiler randomly turning off. However. Since his visit the hot water has been noticeably cooler than it was before. I’ve tried to change the temperature of (DHW)...
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