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cylinders

A cylinder (from Greek: κύλινδρος, romanized: kulindros, lit. 'roller', 'tumbler') has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. Geometrically, it can be considered as a prism with a circle as its base.
This traditional view is still used in elementary treatments of geometry, but the advanced mathematical viewpoint has shifted to the infinite curvilinear surface and this is how a cylinder is now defined in various modern branches of geometry and topology.
The shift in the basic meaning (solid versus surface) has created some ambiguity with terminology. It is generally hoped that context makes the meaning clear. Both points of view are typically presented and distinguished by referring to solid cylinders and cylindrical surfaces, but in the literature the unadorned term cylinder could refer to either of these or to an even more specialized object, the right circular cylinder.

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  1. R

    Green plastic over Glenhill Cylinders

    Hi Just took order of the new Glenhill green envirofoam vented copper cylinder. Unfortunately I did not realise the green cylinder in the pictures was actually a plastic sheet over the insulation. This is going on a kitchen wall and previous one was the spray on foam painted white to blend in...
  2. O

    UK Cylinders ProLite Air twin coil solar indirect unvented 300ltr

    Hello! I have a new Vaillant boiler being installed and will install a new cylinder at the same time. Our installer is recommending a UK Cylinders ProLite Air twin coil solar indirect unvented cylinder 300ltr. According to specs the standing heat loss is 1.80 kWh/24h which seems pretty decent...
  3. philw67

    Why 2 cylinders in my loft?

    This is a picture of the heating setup in our loft. It's all relatively new and I was wondering why we have two enormous cylinders? One is for hot water, I get that but the system is a mains fed pressurised system so what is the second one for please? There are also two smaller tanks which I...
  4. F

    Can I pair up 2 Santon Cylinders with this new Worcester Boiler?

    Hi all Bit of a story here. We moved into our house in March 2021 and had lots of jobs to do. On buying the house we were told that the current Boiler was not fit for purpose and we received a £2,500 rebate off the house price so we could get a new boiler fitted. So, the new Boiler was...
  5. J

    Air gap under copper cylinders

    Hi all Thanks for the secondary return in plastic pipe replies....Nice one Just have another question i can't find an answer to How does the bottom of a hot water copper cylinder rot if there's no circulation of air passing through it. I know it rots but actually why it rots is my question???
  6. J

    Unvented Cylinders Hot Distribution

    Unvented Cylinders sealed system - I am looking to start doing more unvented heating installs having become well versed to fitting combis , my question is if you situated a unvented cylinder in a downstairs location with multiple appliances upstairs would the hot distribution pipe have adequate...
  7. Roy_66

    Hydrogen Boilers, Heat Pumps, Funny Cylinders etc. etc.

    Some positive news. For anyone not seen, interesting video from Roger B. on the future for boilers vs heat pumps etc. etc. Includes some more slightly wacky but interesting points like horizontal cylinders and boilers - anyone done one / seen one on hol ? Was interested also that their...
  8. D

    Dimplex or Rointe Water Cylinders

    I’m looking for some brand advice around water heaters. We are looking to replace our water heater with a Wi-Fi connected model from Dimplex or Rointe because they will give us the remote access via the app to control the water heater. We have Dimplex heaters in the house but I’m not sure...
  9. R

    Unvented direct cylinders, whats the best?

    Looking at getting an unvented cylinder fitted, looking for any feed back on the diffrent brands, good bad etc. Thanks
  10. C

    Any primatic cylinders suitable for a solid fuel fire?

    TLDR; Why are modern primatic cylinders unsuitable for use with an uncontrolled heat source? The scenario: I have a friend (really) that needs a new HW cylinder fitting. Currently there is a 40ish year old 36x18 primatic type cylinder in place (I assume that’s what it is as it is ‘self...
  11. plumb_know

    solar panels with unvented cylinders

    Hi everyone, I am qualified to work on unvented cylinders but have no experience with solar panels. I have a customer which has a leaking unvented cylinder with solar coil attached. am i legally allowed to replace the cylinder,is their regulations with solar? if so, is it easy to drain the...
  12. gmartine

    Telford Tempest cylinders

    Anybody have anything good to say about them? Client wants to use one as he says "someone recommended them". Spec looks ok with lifetime warranty but a few on trust pilot say they don't honour it so who really knows...
  13. Gasmk1

    anybody know much about the cylinders with integrated air source heat pumps

    anybody know much about the cylinders with integrated air source heat pumps
  14. T

    Unvented cylinders - where's the best place to buy?

    Hi all, Former G3-qualified heating design engineer for new-build helping start up a new company. I'm currently looking at trying to gather a bit of information on whether installers are still predominantly using merchants to buy their cylinders or whether people mostly use online (at least for...
  15. G

    Using solar (and attached direct) cylinders as heat stores

    Hi, this is all at the stage of considering theoretical possibilities but I'd really appreciate comments and guidance on the workabilities of the ideas proposed: (multistage diagram then explanation): (if that didn't work try this: Imgur). One positive with the ecological movement for many of...
  16. Scott_D

    Servicing unvented cylinders

    Anyone do this? How often do you have to go back because the PRV drips after testing? I have been asked to service a boiler and cylinder but not sure it’s worth the hassle
  17. G

    Why are Cylinders rarely in the loft for Trad. Gravity Vented Systems?

    Sorry if I come at this form the wrong direction. I'd like to move my vented-cylinder into the loft. I run two shower-pumps too. I realise a sealed-cylinder is the easy route. Sadly I've not got much mains pressure. Combination boilers don't really have the grunt for fire-hose showers. I'm...
  18. quality

    Advantage unvented cylinders

    Anyone got any pro`s or cons on the above from williams?
  19. Ted808

    HOT, very hot, too hot, hot water, stored, cylinders,

    Hey guys I've had a two jobs where cust is complaining of hot water being too hot. One is an old UNVH cylinder and the other is a very, very old hot water-yellow jacket and cold storage tank set-up. Now I'm wondering this is - why has the water over time apparently got hotter? Bear in mind, in...
  20. B

    How Do I Shut Off My Water Supply?

    Hello! I'm planning to replace my bathtub mixer, but obviously need to shut off the water before I begin. There are no valves for the hot/cold water pipes in the bathroom. The problem: I'm in an apartment and my water tank is old (circa late 80s/early 90s). I can't figure out what needs to be...
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