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A geyser (, UK: ) is a spring characterized by an intermittent discharge of water ejected turbulently and accompanied by steam. As a fairly rare phenomenon, the formation of geysers is due to particular hydrogeological conditions that exist only in a few places on Earth. Generally all geyser field sites are located near active volcanic areas, and the geyser effect is due to the proximity of magma. Generally, surface water works its way down to an average depth of around 2,000 metres (6,600 ft) where it contacts hot rocks. The resultant boiling of the pressurized water results in the geyser effect of hot water and steam spraying out of the geyser's surface vent (a hydrothermal explosion).
A geyser's eruptive activity may change or cease due to ongoing mineral deposition within the geyser plumbing, exchange of functions with nearby hot springs, earthquake influences, and human intervention. Like many other natural phenomena, geysers are not unique to planet Earth. Jet-like eruptions, often referred to as cryogeysers, have been observed on several of the moons of the outer solar system. Due to the low ambient pressures, these eruptions consist of vapor without liquid; they are made more easily visible by particles of dust and ice carried aloft by the gas. Water vapor jets have been observed near the south pole of Saturn's moon Enceladus, while nitrogen eruptions have been observed on Neptune's moon Triton. There are also signs of carbon dioxide eruptions from the southern polar ice cap of Mars. In the case of Enceladus, the plumes are believed to be driven by internal energy. In the cases of the venting on Mars and Triton, the activity may be a result of on solar heating via a solid-state greenhouse effect. In all three cases, there is no evidence of the subsurface hydrological system which differentiates terrestrial geysers from other sorts of venting, such as fumaroles.

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  1. C

    Ecodan heat pump hot water help

    Hello, I hope somebody may be able to help. I have a ecodan heat pump system and have no hot water. The controls are set correct but the light for the boiler is blue. Anyone know what I’m going wrong please? Thank you!!
  2. J

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  3. J

    Approx price for replacing tempering valve on solar hotwater

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  4. Z

    Potterton Powermax HE: Only generates one showers worth of hotwater at a time

    I've just moved into a property with a Powermax HE boiler, and it only seems to produce one showers worth of hot water at a time. I then have to boost it for an hour before we can get another shower. The hot water is set to come on from 13:00 to 17:00 every day. Its controlled by a Hive system...
  5. G

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    My daughter has all electric heating, however, the lower economy 7 immersion has failed (high resistance short to earth). I received what I consider a ridiculously high quote of over £400 to drain the tank and replace both immersions (upper boost immersion is working but 8 years old so I assume...
  6. king of pipes

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  7. N

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  8. J

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  9. H

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  10. I

    Pump makes screaching noise for 5 seconds when hotwater is called.

    I replaced a faulty grundfos pump with a new grundfos central heating pump, and all seems to be ok, in terms of function etc. however, one issue i have is that when hot water is called for (alone) then their is a screaching noise coming from pump/3 way/or other which lasts for around a few...
  11. J

    Hotwater cylinder pipe problems.

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  12. W

    Help - desperately seeking box key spanner for oso immersion

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  13. T

    Radiators Plumbed in to Hotwater

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  14. H

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  15. M

    Low hotwater pressure in mixer tap in kitchen sink

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  16. hary_j

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  17. L

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    Hi, I have a shower unit that I cannot identify, there are no names or marks on it and it was in the house when we moved in - so it must be more than 12 years old. The thermostatic cartridge has failed, the shower runs cold all the time despite there being hotwater available to it. I have...
  18. S

    Vaillant combicompact ecomax - excessive noise from cold

  19. S

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  20. J

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