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Height above mean sea level is a measure of the vertical distance (height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as orthometric heights.
The combination of unit of measurement and the physical quantity (height) is called "metres above mean sea level" in the metric system, while in United States customary and imperial units it would be called "feet above mean sea level".
Mean sea levels are affected by climate change and other factors and change over time. For this and other reasons, recorded measurements of elevation above sea level at a reference time in history might differ from the actual elevation of a given location over sea level at a given moment.

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  1. B

    Microbore pipe showing above radiator!!

    Newish house with radiators that have microbore pipe but on one of them the pipe is sticking up above the radiator which looks unsightly. Is it possible to push the excess pipe back into the wall? I'm worried about causing a leak.
  2. H

    Water mark above shower

    Hello, I’ve just bought a house in London and have noticed a water mark form on the ceiling of my bathroom after having a shower. It tracks along in the shape of a pipe, starting above my shower cubicle for about 1m in length. It then dries completely undetectable within a couple of hours. The...
  3. J

    Tap washer to sink: above or below sink?

    I have purchased two Bristan Renaissance basin taps containing one black rubber washer each. The Bristan instructions say to put the rubber washer underneath the sink followed by the brass nut. I have always put the rubber washer underneath the tap and on top of the basin. Any suggestions of the...
  4. Lumen

    Capping off radiator above the floor, please advise.

    Hey guys, Quick question for all the I knowledgeable plumbers out there. I need to remove one radiator which is first in line, as that room is being knocked down. Unfortunately I can’t cap off below the floor as it’s tilled. What’s the best course of action here? Cap it off above the floor...
  5. E

    Running pipes above boiler - air trap?

    Hi We installed a combi boiler in an upper flat by taking the pipes up (above the boiler) and into the loft, and then dropped them back down to the radiators in 3 different rooms (as opposed to the normal method of running the pipes under the floor beneath the boiler which was not possible in...
  6. M

    Installing 1800mm x 600mm radiator fed from above

    Hi everyone, I want to fit a tall rad in my bathroom which will be fed from above, but I would like to keep the pipework to a minimum. Is it necessary to run both pipes to the bottom of the rad, flow to the bottom and return to the top, or will it work with both to the top? I'm not sure as yet...
  7. M

    Install a tall 1800mm x 600mm rad in my bathroom fed from above.

    Hi everyone, apologies if this is a dumb question. I want to fit a tall rad in my bathroom which will be fed from above, but I would like to keep the pipework to a minimum. Is it necessary to run both pipes to the bottom of the rad, flow to the bottom and return to the top, or will it work with...
  8. K

    Wood stove above with thermal store below - can this work safely?

    Hello all, I'm searching for advice on my new system being fitted into a very old stone house in France. We have purchased a thermflow 300L thermal store with a built-in expansion tank to work with multiple heating inputs (solar, electric and wood burning stove boiler). We are running 7 rads...
  9. S

    Mains Pressure Tap above Consumer Units OK? UK Law *See Photo*

    I would like a professional plumber's advice on this attached image, which shows a mains pressure pipe with tap located above the consumer units. Is this ok for the legal requirements in the UK? Can someone let me know what the law is on this matter please? have a link? Thanks all.
  10. J

    Flue too close to window above flue

    Hello! Hope you're all well. I've read guidance and searched the forums before posting this..... Had our boiler serviced and had a risk notice put on it due to the flue being too close to an openable window. A flue installation fault was also found (sloping down wrong angle for condensing to...
  11. P

    Can a boiler be installed above a toilet?

    We are due to have our boiler replaced. It is above the toilet in our bathroom. The company that are due to replace the boiler said that we need to put a cupboard around the boiler somehow. There used to be a door in between the toilet (and boiler) and the rest of the bathroom. If we put the...
  12. J

    Hot water temp 20C above desired temp set on dial

    Good Morning. Are you all fed up with me yet? I'm posting yet another separate thread. Update. As you know, last night I fired up the boiler after re-filling the system following some repairs I had made... Actually I spare you all the details, I perhaps give to much Long story short. I've got...
  13. A

    Correct height of towel radiator above floor

    Hello, Just doing first fix pipework for a bathroom and two ensuites. Just wondering what the convention for height above floor for towel radiators is please? I will be bringing two chrome pipes out of the stud wall at the correct height for angle valves. I am also putting extra timber...
  14. P

    Worcester 28i junior leaking from above pump

    Hi all. I don't do too many breakdowns and repairs so this one has me stumped. Not sure if it's a common problem but there is a leak coming from above the circulating pump down the right hand side of the pump. Is this a case of a perished o ring or gasket or is it something more? Any help...
  15. Q

    Opinion needed - Noises from above!

    Hi - hoping someone on the forum can give me an opinion on what the noises are from the flat above me. I live in an apartment block and at the start of 2018 came home from holiday to find staining on the roof of the two bathrooms and also on the wall of the kitchen. The agents for the flat...
  16. D

    15mm Soft Copper Pipe for above ground mains

    Hi, Are there any current regs prohibiting the use of 15mm and 22mm soft copper coils for an above ground domestic water supply? I've been given half a coil of 15mm soft copper which is coated in blue plastic and it would be perfect for outdoor tap installs as it's flexible and would require few...
  17. J

    Shower waste above low point of shower tray

    Not all the water is draining after showering because the top of the waste is above the tray (See attached pic) its a 90mm trap and the top is 110mm diameter. if the top was around 100mm it would fit below the lowest part of the tray. Any advice appart from lathing down the top of the waste?
  18. M

    Gas pipe in insulation layer above precast beam and block floor

    When installing a gas pipe in the insulation layer below the chipboard flooring. And above the precast beam and block floor. Do most tend to run the gas pipe underneath the insulation resting on the damp course (in coated copper). Or notch out on the top of the insulation and run the pipe in...
  19. J

    Minimum distance above combi boiler?

    We were due to have a combi boiler fitted whilst we were away, however the plumber called to let me know that our desired location (see pic - white nylon bag pushed in hole, above metal track) was not achievable as it would result in the flue being above the ceiling and therefore not legal or...
  20. P

    is this normal plumbing not dropped through floor above?

    Hi all our kitchen ceiling had to come down, so while all the building work is being done we also decided to have a new ch system fitted with combi boiler. above kitchen i get home to find boiler fitted but instead of dropping pipes down from boiler and fitting along joists the plumber gone...
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