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A hydrothermal vent is a fissure on the seafloor from which geothermally heated water discharges. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart at spreading centers, ocean basins, and hotspots. Hydrothermal deposits are rocks and mineral ore deposits formed by the action of hydrothermal vents.
Hydrothermal vents exist because the earth is both geologically active and has large amounts of water on its surface and within its crust. Under the sea, hydrothermal vents may form features called black smokers or white smokers. Relative to the majority of the deep sea, the areas around submarine hydrothermal vents are biologically more productive, often hosting complex communities fueled by the chemicals dissolved in the vent fluids. Chemosynthetic bacteria and archaea form the base of the food chain, supporting diverse organisms, including giant tube worms, clams, limpets and shrimp. Active hydrothermal vents are thought to exist on Jupiter's moon Europa, and Saturn's moon Enceladus, and it is speculated that ancient hydrothermal vents once existed on Mars.

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  1. Z

    Vaillant VR10 with a vented cylinder?

    Hi, I was hoping to replace an old system boiler with a Vaillant Ecotec Exclusive 627 system boiler, thats the one with the diverter valve so no need for zone valves, controling it with a V-Smart and a VR10. I've spoken to Vaillant Tech and they said you cannot use the VR10 with a vented...
  2. H

    Constantly losing hot water pressure from Direct Vented Cylinder

    Hi, I have a hot water cylinder which feeds 3 outlets (kitchen sink, basin in bathroom & bathtap) which has never had very good pressure (probably because of the set-up) but last year got so feeble that a guy suggested fitting a pump alongside the cylinder. This can work fine but then all of a...
  3. S

    Pressurizing a vented cylinder

    Hi guys, I have a question regarding converting an open vent system (copper cylinder) to pressurized, reason being not enough drop from the loft to power a shower, while i know the common advice is to buy a special unvented cylinder I can see no reason why an unvented copper cylinder cannot be...
  4. dave100

    New unvented cylinder / Replace old vented cylinder and add a ST pump?

    Hello, I am renovating a small bathroom in an apartment on the 5th floor. Heating is electric, no gas or oil. I have four (related) questions about this below. I had intended to reuse the cold water tank and the cylinder sitting underneath it but my plumber suggested I replace the cylinder as...
  5. C

    Lower flow temperature in vented HWC w/immersion heater weekly cycle?

    Newly bought home has somewhat older plumbing, but recently fitted condensing gas boiler & HW cylinder. System is open vented. When we moved in we had a few control problems, engineer who fixed it replaced the programmer, said there were a few broken wires (which he somehow managed not to use)...
    • combedcloud22
    • Thread
    • immersion heater temperature vented cylinder
    • Replies: 0
    • Forum: Central Heating Forum
  6. J

    Vent pipe size for vented cylinder installed in 2005-6

    Hey, having searched this forum and last building regs (2000) from around that time... Any idea what the correct size is for a vent pipe for a vented hot water cylinder, gravity fed? I.e. the one that is continuously rising back up to the cold water feed tank for the cylinder? Have discovered...
  7. C

    Vented cylinder installation in Bedford ASAP

    Hi, my hot water cylinder started leaking two weeks ago, my landlord has British Gas cover and they were meant to be coming tomorrow to fit a new one, the cylinder got delivered this morning but they’ve then cancelled due to strike action so can’t come for another two weeks which in the...
  8. P

    Pricing to replace a vented cylinder with an unvented cylinder (megaflo)

    Hello , ive recently gone out on my own, i have been working in the industry 15years now /g3 qualified and i would just like to get some advice from the knowledgable people on this forum! i have done a lot of installing but haven't really got involved with the design as somebody else has done...
    • Piperdave22
    • Thread
    • america cylinder megaflo pricing replace unvented unvented cylinder usa vented vented cylinder
    • Replies: 10
    • Forum: USA
  9. B

    Vented Cylinder Recommendations

    Hi All, Wanted to get some thoughts on vented cylinder recommendations, I saw a thread on unvented recommendations and not sure it was very conclusive. I've been doing a fair bit of research and cant work out the best route, I started looking at RM Cylinders as that's the one I'm replacing but...
  10. mbc0

    Tightening the connectors on a vented cylinder

    Hi all, 2 things if that's ok? Firstly what do most people use to tighten the connectors on a vented cylinder? the insulation is so thick the connector is in a tunnel of approx 1 1/2 - 2 inches deep so impossible to get a spanner in there without removing loads of insulation? I may have to...
  11. G

    Replacement of indirect vented cylinder with indirect unvented cylinder

    Following completion of plumbing work today I would appreciate any advice on the following two issues : Q1 I have had a 150litre horizontal indirect cylinder (Telford Brand) installed today on an unvented system. After the plumber left I saw the installation instructions which state – “ The...
  12. C

    Gledhill envirofoam open vented cylinder

    Fitted my first envirofoam stainless steel cylinder yesterday! Impressed with them compared to the crap quality copper tanks we get sold around my way. £130plus vat vat for 1050x400 no fittings required as they are all 22mm compression. Comes with a shower draw off / secondary return as...
  13. D

    Direct Vented cylinder swap...

    Hi guys, Long time reader, first time poster. Basically I'm planning on swapping out a cylinder. There is no gas in the flat, so everything has to be warmed by electric. One shower/bath, kitchen tap and basin tap. Rads are all electric too. So the current cylinder is mains fed, and what...
  14. V

    Best Way To Fit A Vented Cylinder

    I was called by a customer yesterday. He informed me that: 'The thing you put in hot water tank is gone. Can you come and sort it out please'? On arrival, his tenant let me in and on further investigation it turns out it was the immersion heater that had packed up. I got into the loft to try...
  15. J

    1200x450 indirect vented cylinder, twin coil for solar.

    Hi all Iv got a 1200x450 Telford cylinder for sale. Brand new, got it as part payment for a job. Here is an ebay link http://pages.ebay.com/link/?nav=item.view&alt=web&id=131319501470 I'm looking for £200 Ono Located in North devon
  16. J

    Hercal 1500 x 500 vented cylinder

    Where is the best place to buy a Hercal 1500 x 500 indirect vented cylinder - can't find one to replace leaking one. Or can it easily be substituted for another make (if so - suggestions?).
  17. the_d_o_t

    system boiler with copper vented cylinder.

    Hi guys, i normally do combination boilers so bare with me if I'm wrong but... i have just been to price up a job, its a conventional sytem with conventional boiler and the customer told me they wanted a new system boiler but dont have enough money to replace the old copper cylinder just yet, i...
  18. N

    Megalife vented cylinder with secondary loop + shower pumps

    New to this forum business and would appreciate your opinions. I am doing a new build in a rural area, I have a private water supply that is 400 Yards in 32mm blue pipe from the water meter (my water boundary). It supplies 30 litre per minute and fluctuates generally between 2.7 and 4.2 Bar...
  19. J

    6 storey house. vented cylinder in basement. Bronze pump sizing issue

    I have a 500L vented cylinder in a 6 storey building. It has a secondary hot water return loop that is currently using a grundfos 15-50 pump. I don't think it's the correct size but i'm unsure because of the differences between a sizing a closed loop system (i.e a heating circuit) and an open...
  20. Worcester

    How long to replace a Vented Cylinder with an Unvented one

    We are always looking to improve our efficiency (and hence money in our pocket :) ) Just wondered how long most people would estimate for a replacement of an vented cylinder with shower pump to an unvented balanced supply system? x man hours / days? Assuming straightforward, i.e mains supply...
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