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A possible world is a complete and consistent way the world is or could have been. They are widely used as a formal device in logic, philosophy, and linguistics in order to provide a semantics for intensional and modal logic. Their metaphysical status has been a subject of controversy in philosophy, with modal realists such as David Lewis arguing that they are literally existing alternate realities, and others such as Robert Stalnaker arguing that they are not.

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  1. N

    Is it possible to not have a b allcock in a cold water header tank?

    For reasons that I won't go into. Is it possible to control the water flow to a cold water header tank without having a ballcock in the header tank? ie to place some sort of control elsewhere in the feed pipe before the water gets to the header tank - turning off the mains water supply would...
  2. M

    Sewer pipe trap issue possible

    Need some advice, neighbors sewer drain keeps blocking up every few months. My wife and I have always chipped in with the other three neighbors for unclogging tho we never experience ours clogging up. Sure we had it clog up once and had it blown out with high pressure water from local plumber...
  3. S

    Possible Leaking Gravity Fed Hot Water Cylinder Valve

    Hi all. This ‘valve’ is at the bottom of our domestic hot water cylinder. Anyone have any idea what it is please? It must’ve been there for many years and seems to be leaking.
  4. F

    Heating Possible conflict between Ideal boiler and Gledhill cylinder

    My heating system comprises an Ideal Logic 12 boiler located downstairs and a Gledhill OV SOL cylinder located upstairs . The problem is that when the Gledhill controls for the “hot water” and “central heading” are turned on the Ideal boiler makes a constant “clicking” noise and tries to start...
  5. K

    How to contact an admin to post a question identified as possible spam

    How do we contact an administrator to confirm a post is not spam: "Your content can not be submitted. This is likely because your content is spam-like or contains inappropriate elements. Please change your content or try again later. If you still have problems, please contact an administrator."
  6. T

    Condensing boiler with rads possible? (no UFH)

    Hi, I have an 20yrs heat only potterton 50e boiler with 196x old house - suspended floor - designer radiators, open vent system and hot water cylinder on first floor with two motorised valves and stat. I want to replace the boiler with minimal cost and max efficiency so thinking of replacing...
  7. Q

    Is this a possible leak?

    I have purchased a thermal camera as my valliant engineer has stated that there is a leak in the property. Struggling to find it however the images attached from the kitchen look suspect. Any advice welcome.
  8. B

    Possible reverse circulation

    Hi all, we've recently moved into a property and believe there is some kind of backflow in the heating system. (I should say I am a DIYer, and not a great one). When we have our hot water on, the rads get hot over time. I've had floorboards up to see if there is a non-return-valve somewhere...
  9. J

    Shower tray drilling advice

    Hi I need to find out if I can drill a larger hole in my shower tray, it’s size atm is 1 1/2 inches (38.9mm) and I want to make it 90mm to increase water removal flow Is this possible
  10. J

    Advice please if possible

    Advice please, I have payed for a boiler to be fitted by a gas safe family member and he took an age to fit it, then came back a week later to fit the 28mm pipe required from the boiler to the meter, since then he has been fobbing me off about a sparky (his friend ) who needs to come and fit the...
  11. M

    Possible Cylinder or blockage problem

    We had three radiators changed and after this the boiler wouldn't fire. Now we have heating but the no hot water. We have had the Baxi man out and he said we are not covered for the problem. Which he thinks is either the cylinder (which he said may be difficult to obtain the part) or a blockage...
  12. S

    Help possible airlock in hot water shower pump Salamander ct50.system

    Good evening everyone. I am after some advice with regard to our hot water system before I call out a plumber if necessary. So about 3 times since Easter we have had what looks an airlock. I have done the trick with a mixer tap which seems to fix it eventually, usually left overnight. I am...
  13. S

    Hi, thank you for allowing me to join, a bit of background....

    I am a reluctant LL of a single property, with a boiler on the second floor that needed an internally fitted flue terminal due to height restrictions, the internal exposed horizontal flue run is 4m with two 90 degree bends totalling just under 6m, I now know more about flue installations than I...
  14. D

    Possible Problem with an EVOSTA 2 pump

    Hi all, I have had a new Grant boiler system fitted which powers 22 rads and an immersion heater - 8 of these rads are large double convectors. We have had a lot of issues with the install of this Grant boiler but my main issue is if the pump is man enough for this system. As mentioned it's a...
  15. C

    Leak hard to find - possible pressure issue?

    Hi all Totally new to this forum and hoping for some guidance. Two weeks ago we noticed a brown stain on our kitchen ceiling. Above it is the bathroom and airing cupboard where our hot water tank is. We have a closed system. The pressure had dropped on our boiler and so we topped it up (have...
  16. michcosg

    Possible to push a push-fit fitting back on a pipe at 3 bar?

    Hi Folks I am considering a job in council block flat which involves amending 15mm copper pipework under 3 bar of pressure. The problem is the local council seem to a bit hard to get a hold of to turn off the water! Thus my plan was to freeze the pipe with an electrical freezing kit and do...
  17. MrGatch

    Possible fault two-port valve

    Hoping you guys can help confirm the diagnosis of a fault before I call a plumber. I've lost heating to the upstairs zone on my heating sysem. System boiler is working fine feeding two other zones and the hot water. The zone is connected via a Nest, which is saying its calling for heat but...
  18. Dave Abe

    Possible Career? Advice welcomed

    So err Hi 👋. Names Dave and I’m a banker (yeah feel free to mock). Always felt in the wrong type of career. Looking to change and gas career looks fairly well paid, of course pending experience and skills. There are a million companies offering courses fast track etc. but if I can cope with a...
  19. T

    Radiator banging / clicking - possible reaction to F1 protector?

    Hi. We’ve had rather a lot of noise issues with our radiators since we had a new boiler installed. Our radiators other than 2 more recent ones are all over 30 years old. When the boiler got installed in the middle of 2020, after the first few days, we had several loud airlocks each day...
    • TheGiantHogweed
    • Thread
    • america banging clicking clicking and clunking dirty kettling possible radiator usa
    • Replies: 64
    • Forum: USA
  20. F

    is it possible to use tile backer boards on masonry?

    hi all i was fixing a leak in my loft shower room. the photos show after i had removed the plaster off the walls. on the edging photo i've measured 20mm from brick to shower tray. on the shower facing side i've measured 13mm. tile is 7mm thickness. i was wondering, rather than pack it out...
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