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Installed base (also install base, install[ed] user base or just user base) is a measure of the number of units of a product or service that are actually in use, as opposed to market share, which only reflects sales over a particular period. Although the install base number is often created using the number of units that have been sold within a particular period, it is not necessarily restricted to just systems, as it can also be products in general. For products which are in use on some machines for many years, the installed base count will be higher than sales over a given period. Some people see it as a more reliable indicator of a platform's usage rate.
Installed base is not the same as the total number of units sold at any given moment in time (***ulative sales numbers), since some of those units will typically be out of use because they have broken, gone missing, or been made obsolete or replaced by newer versions.

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  1. C

    Horizontal Un-vent Cylinders Have you Installed ?

    Have any you boys & girls got any experiences installing these good or bad ? What are the best makes, any recommendations ? Thanks CW
  2. P

    Salamander Home Boost, anyone installed one

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  3. C

    Gas installed in new houses after 2015

    I have been out with my friends in low places at BG today - they say that it will be a government stiplulation that all new homes built after 2015 ish will not have to have a gas supply installed but will be a 'chargable extra' Is this true - or have my beer goggles rendered me out of focus...
  4. S

    Do we NEED a pressure reducing valve?

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    • SlowMoFlow
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    • boiler fitted installed pressure pressure reducing valve reducing valve
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  5. D

    boiler about to be thrown off high cliff

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  6. A

    G3 Unvented Qualification plumber required

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    • andyl
    • Thread
    • email installed plumber plumber required qualification required still unvented
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  7. 3

    How to drill the the BACK of tile ALREADY installed onto masonary wall

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  8. E

    Boiler not firing constantly when heating up from cold

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    • Forum: Plumbing Jobs | The Job-board
  9. D

    thermal store incorrectly installed

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  10. R

    Boiler banging after turning off

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    • Forum: Plumbing Jobs | The Job-board
  11. C

    Underfloor heating installed without insulation

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    • cgencer
    • Thread
    • about heating installed insulation screed ufh under floor heating underfloor underfloor heating without
    • Replies: 50
    • Forum: Plumbing Jobs | The Job-board
  12. D

    Installer installed undersized radiators

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  13. G

    Vented Cylinder, is it safe?

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  14. F

    Need quote for new combi boiler installed in E15

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  15. E

    Hot Water Storage

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  16. R

    Is it okay? No Inhibitor?

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  17. B

    rhino 90 installed by mentalcase

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  18. C

    Shared supply - badly installed

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  19. B

    Magnaclean TwinTech - Anyone in N London installed one?

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  20. M

    Problems since new hot water tank installed

    Please bear with me, I'm a newbie and female to boot ! Anyway I recently had a larger capacity hot water tank installed to replace the 25 year old one. Since it has been installed I've had a host of problems.. 1) shower pressure has dropped dramatically and splutters 2) If I now have the heating...
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