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In geometry, topology, and related branches of mathematics, a closed set is a set whose complement is an open set. In a topological space, a closed set can be defined as a set which contains all its limit points. In a complete metric space, a closed set is a set which is closed under the limit operation.
This should not be confused with a closed manifold.

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  1. U

    Closed off second lead pipe in kitchen

    Hi, We live in a lower flat (one up/one down) and the mains water is delivered to both flats from a single on pavement stopcock. Our central heating system is fed from a tank above the boiler and I believe that this tank is fed from another tank in the upstairs flat's loft. When running...
  2. B

    Best 2 port 22mm zone valves normally closed

    So heres the story, my own boiler was replaced a year ago. All 4 zone valves were replaced at my suggestion..... for reliability reasons (they were 20 years old) - Now the motor has conked out on one of the new ones in 15 months. So before some random stuff gets put in - I want a 20 year life...
  3. J

    3 pumps in 12 months closed thread

    Chalked I'm not sure why you have closed my thread, surely the idea of this forum is for an engineer to put a problem out there for others to help if possible. I see nothing wrong with my replies but you have seen fit to close the thread without explanation.
  4. M

    Does a Closed Central Heating system need a Bypass Valve open?

    HI All, Quick question, had problems with our central heating system, with some radiators not heating up properly. Finally mapped it all out and found that hotel water come from the boiler and through the pump, then there are 3 options: 1) Branch off Through Central Heating control valve to the...
    • Mtbamplumb
    • Thread
    • bypass bypass valve central central heating closed heating heating system system valve
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  5. S

    Combi boiler heating issue 2

    I have no idea why the original Combi boiler heating issue was closed ?. Just wanted to let those whom helped the out come and a thank you to "Lame Plumber " that his help solved the issue. it was indeed the thing. .
    • Starship1
    • Thread
    • boiler central heating system closed combi combi boiler issue oil original rules
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  6. U

    Old non-TRV radiator valves

    Hi all, I have old style radiators, on one side is a plastic cap with a circular arrow on top and a +- sign (lock shield valve?). I can turn the cap which presumably opens or closes the valve to allow how water into the radiator. However, is the valve simply open or closed or is it variable...
  7. V

    Thread Closed!!!

    Looks as if cropie is going to have a busy day today. No chance of a drink in the arms then? Blink and you'll miss one:)
  8. R

    15000 threads closed

    Well done croppie! A great mod, a nice guy, and the tightest man in world! Beers on you crops!! much love old chap.
  9. D

    Green Deal Shambles, Scheme closed

    Just came across this article in the Daily Heil Government closes down £120m Green Deal scheme as funds runs out | This is Money
  10. S

    Re- Closed Thread - Worcester-Bosch Junior 24i fault light but holds pressure...

    I misunderstood the purpose of this forum, as I thought it was a general help and information forum rather than a Certified plumbers forum, which is what the answers received imply? I have absolutely no intention of doing any boiler works (I don't trust myself to put the wheel back on the car...
  11. M

    Closed to public oil forum

    Is there any reason there isn't a closed to public oil forum? Only reason I'm asking is I have a few questions regarding oil prices etc and don't really want to fill the arms up with them. Is there any chance 1 could be set up like the commercial so arms members can gain access to it?
  12. M

    Closed Top Veto Pro Pac Tool Bag XXL-F

    Do I or don't I spend £180! seems to be price fixed anybody got one? Is it worth it?
  13. J

    Best pump for a 55 radiator closed pressure central heating system.

    Hi ! new to this forum ..so please be gentle ! problem rads heat up slow never totally hot furthest rad get cold warm cold warm some rads get hot then cool quickly.. rads are not warming up outside temp compensator is used rad circuit set at 22 degrees following facts...
    • Jack Gill
    • Thread
    • central central heating closed heating heating system pressure pump radiator system
    • Replies: 44
    • Forum: Plumbing Jobs | The Job-board
  14. P

    Plumb Center closed my trade account

    I went into Plumb Center late afternoon yesterday desperate for 3 rads after PTS let me down ( I ordered them a week previous and when I went in they hadn't even ordered them, I have a wasted day today now with no work). I tried to order some more at P C but they couldn't find my details and had...
  15. R

    heating problems

    Hi wondered if anyone can help me, have just changed the trv valves on my open vented heating system, have bled all the rads after refilling, now all the rads downstairs are cold, have turned off all the other rads to try and push heat to only the open rad , still wont get hot, pump seems to be...
  16. B

    Closed until April

    Who knows crack with next tax bracket malarkey ? What's the jump got to go see her Wednesday as we're hovering close . Cash jobs it it is then lol
  17. T

    Alpha boiler engineer in Kent?

    My alpha cb28x is heating the radiators although set to HW only. I've tried turning the CH thermostat to zero but makes no difference. The hot water is working fine. Can anybody give me an idea of what might be wrong and how much it will cost to fix? Thanks.
  18. M

    Gas safe closed forum

    Does anyone know how you get onto the gas safe installers forum :)
    • Mickplumb
    • Thread
    • better closed gas gas engineer gas safe gas safe register gsr private safe should users
    • Replies: 17
    • Forum: Plumbing Jobs | The Job-board
  19. A

    zone valve issues

    hi guys looking for some technical advice just replaced a drayton ZA5 actuator valve head as when the customer was putting the hot water on they were getting heating aswell the problem ive found is that the valve stays open constantly, when power is cut to the system it closes but when i switch...
    • Andymav
    • Thread
    • central heating system closed forum issues plumbing power valve water zone zone valve
    • Replies: 44
    • Forum: Plumbing Zone
  20. C

    Hammer Arrestors

    I note that one of the internet videos showing how to install a pressure reducing valve also shows water hammer arrestors being installed to, e.g. washing machine supply outlets. Is this necessary or just a precautionary measure?
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