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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. 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...
  2. P

    is this normal plumbing not dropped through floor above?

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  3. G

    External soil stack below window

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  4. O

    Testing for leaks in oil line

    I wonder if someone can reassure me about this... Our domestic oil tank was recently found to be empty many weeks ahead of schedule. There was no sign of theft and our engineer queried a leak in the underground upvc pipe that links the tank to the boiler. He isolated the tank and using a...
  5. M

    Baxi Platinum or or Vogue Gen1 40 kW

    Hi everyone. My first post here. I am having a combi installed next week by someone I trust and I know he will do a proper installation and power flush etc. Now, I have decided on 2 boilers for our large 4 bedrooms house. I don't want an open system as my wife and I are blind and our talking...
  6. C

    Ideal E Type Boiler Ventilation Requirements

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    • Competent DIYer
    • Thread
    • above boiler ideal looking mechanical oil requirements ventilation
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  7. jaydebruyne

    Above Ground Drainage

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  8. R

    Incoming gas pipe

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  9. J

    Zero ground clearance under single panel rad

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  10. 2

    Baxi combi boiler leaking

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    • 2fat2slow
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    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  11. W

    Out of square

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  12. B

    Baxi 105e.

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  13. S

    UFH won't go above 19 deg

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  14. F

    Bosch M10 Timer problem 3 pos switch is ON regardless of position

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  15. B

    moving combi boiler to garrage

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  16. B

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  17. K

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  18. W

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  19. W

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  20. S

    Glow worm hideaway.

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