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cylinder

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. P

    Unvented Cylinder Single coil heat pump vs twin coil solar

    Hi, I'm looking to purchase a 300L unvented indirect cylinder to work with a standard heat only boiler. I may have solar panels in the future, but likely the PV kind rather than the thermal kind, and won't be having heat pump in the future. So the cylinder would be connected to the boiler at...
  2. papachumba

    Acton W3 Servicing the Ariston Megaflo Cylinder & Vailant Ecotec 428

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  3. papachumba

    Acton W3 Servicing the Ariston Megaflow Cylinder & Vailant Ecotec 428

    Hi all, need someone to do my annual gas service and issue me a domestic gas safety certificate. In addition the megaflow cylinder needs checking and anti corrosion electrode replacement (have the part). In addition some of the honeywell motorised valves need replacement.
  4. nashant

    Vibration when first opening hot tap after u/v cylinder heating cycle

    Hi all. As the title says, I have a problem with an unvented cylinder I had installed last year where the first time I turn a hot tap on after the cylinder has been heated I get what sounds like a vibration. It generally starts about 1s after I open the tap and lasts for about 1.5s. I've...
  5. chris020

    Hot water cylinder circulator

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  6. J

    Is Pressure checked at same time of hot water cylinder repair

    Hello, hoping someone can advise me. My boiler stopped working - no hot water or central heating. Called out a company who came and assessed the problem as being that the hot water element in the immersion tank needed replacing. (I don't know exactly what it is called as the company has still...
  7. J

    Direct Hot Water Hot Water Cylinder Repair

    Hello, hoping someone can advise me. My boiler stopped working - no hot water or central heating. Called out a company who came and assessed the problem as being that the hot water element in the immersion tank needed replacing. (I don't know exactly what it is called as the company has still...
  8. J

    Cylinder System not running heating and water at the same time

    Hello, Newly moved into a house with a mains fed cylinder system. I've never had one before and struggling to get it working. When I turn either heating or water off at the timing unit, the other works fine. Eg, with heating off, water works and vica versa. The indicator lights are solid blue...
  9. H

    Constantly losing hot water pressure from Direct Vented Cylinder

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  10. P

    Unvented Cylinder Recommendations

    Hi all, looking for some recommendations for a slimline indirect unvented cylinder to go with a new system boiler that we're having installed soon. Only need around 120/125 ltr for our usage and could possibly make do with 100. Been looking at a few different brands including the Megaflo which...
  11. Z

    Hot water cylinder leaking around joint with hot water inlet

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  12. R

    Unvented cylinder no cold water to multiple outlets

    Hi, I’m having issues with cold water to multiple outlets. Taps, showers, toilets cold water is fine at the kitchen sink. The hot water system is a Glenhill unvented cylinder. Hot water is fine at all outlets. I assumed the cold outlets not working were from the balanced cold from the...
  13. T

    Improvements for pre-lagged DHW cylinder

    I have a factory lagged indirect hot water cylinder in the airing cupboard, installed about 2002. The control thermostat is fitted near the bottom of the cylinder and the primary circuit connections are near the top and bottom of cylinder connected to a gas fired boiler. This results in nearly...
  14. N

    Draining an unvented cylinder

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  15. P

    Gledhill StainlessLITE Plus Horizontal 204 L Cylinder

    Hi All, I have recently changed heating source to a heat pump and so I have had a new water cylinder installed (different internal element required). This means that I have a 2.5 year old StainlessLITE Plus Horizontal unvented mains pressure 204L cylinder left over. We had it installed in Jan...
  16. Z

    Thoughts on Prostel unvented cylinder horizontal

    Just looking at getting an unvented cylinder. Screwfix do an RM cylinder called Prostel. Anybody had experience with these. £830 for 250l horizontal.
  17. 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...
  18. A

    Gledhill envirofoam stainless cylinder 140ltrs new

    I bought this over a year ago as was advised by a family member who is a plumber to swap cylinders instead of a new combi boiler. Turns out we needed a new combi boiler. I’ve had it too long to take back to the merchants. Would anyone be interested in it. I live in York. It was £225 I think but...
  19. ridgerunner

    Will switch to unvented HW cylinder reduce shower performance

    Hi, am getting our bathroom updated and local company suggested ditching our traditional attic CW tank/vented cylinder and pump for the shower and install an unvented pressurised HW cylinder instead. We have been told that this will not lead to a drop in effective pressure from the shower. Is...
  20. R

    Will shower pressure be less if switch to an unvented HW cylinder?

    Hi, am getting our bathroom updated and local company suggested ditching our traditional attic CW tank/vented cylinder and pump for the shower and install an unvented pressurised HW cylinder instead. We have been told that this will not lead to a drop in effective pressure from the shower. Is...
    • ridgerunner
    • Thread
    • cylinder pressure shower pressure
    • Replies: 4
    • Forum: Central Heating Forum
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