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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. VirtuosicVirtuoso

    Newly installed immersion heater suddenly stopped working after a week. What could be the issue?

    I've recently replaced an immersion heater for a direct cylinder, for 2.75-3kW. The new one seemed to be working a week before I got a callback. I checked the resistance of the immersion heater, and it read 19ohms, and the voltage on the live and neutral read 230V, but there was no humming or...
  2. F

    Replacing an installed megaflow system with a combi-boiler when current boiler needs replacing

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  3. RenzoPan

    Was my smart thermostat installed incorrectly? Or what is the issue?

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  4. W

    Can I have single zone central heating when pipe installed for 2 zone?

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    • waynetr
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  5. C

    Water Hammer after new bathroom installed

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  6. I

    new property, iFlow + navian installed incorrectly?

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  7. S

    Dangers of incorrectly installed boiler

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  8. A

    UFH - Is this Installed Correctly?

    Hi - please help me. I think our UFH is installed incorrectly. Please see pictures (if anyone needs more images I can take them). UFH-Full-View-Labelled - https://ibb.co/3C0MsKD The problems we have are. The heating takes FOREVER to heat the rooms. The circulation pump is running all the...
  9. O

    Washing machine installed correctly?

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  10. S

    New boiler - questionable install

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  11. J

    Vent pipe size for vented cylinder installed in 2005-6

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  12. W

    New cartridge in but shower head still leaks.

    Just installed a new Moen shower cartridge. The shower head still leaks. What is causing this?
  13. I

    Is my flue installed incorrectly?

    Hi guys and girls. So…. Bought an apartment in a conversion rather than new build. Since buying it I’ve been experiencing headaches, sickness and dizziness. At the time I just thought I was coming down with something but then a TV engineer came to install an aerial in the loft and he showed me...
  14. Geolo85

    redo of newly installed kitchen sink and drain line

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  15. J

    W. Sussex - destrat pump to be installed

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  16. Strebor

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    This is a weird one, for sure... I had an old Vaillant combi replaced by a new Worcester Greenstar 4000 by Boxt. It was as simple a job as you can imagine - direct replacement... my house is a simple 2 up 2 down semi - nothing remotely complicated. However for the last two months since it was...
    • Strebor
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  17. J

    Unvented cylinder installed but no G3 qualification

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    • Jurgenjay
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  18. A

    Rehau manifolds installed backward

    Had a contractor come out today for in-floor heat not working. I have 2 zones each with Rehau manifolds supplied from a single pump and neither zone worked. Contractor felt the pump had failed and replaced it only to discover that the system still did not work. After much consideration...
  19. G

    Grohe Sense Guard (automatic valve) - Anyone installed or use them?

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  20. J

    Installed Unvented cylinder will cause water pressure high?

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