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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. RenzoPan

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

    When I set it to be on via phone, light A comes on (telling it to be on), but light B won’t come on, so the boiler doesn’t start. I either need to set A on and off several times via phone, or turn it off and on again via switch (C). When I set the water to be on, it works instead, and green...
  3. I

    new property, iFlow + navian installed incorrectly?

    I have a Navian boiler with an iFlow air system that provides air around the house via high velocity conduit. It's just over a 1 year old property and I just moved in and found the heating suboptimal. I have had a plumber indicate the system is designed and installed incorrectly, which the...
  4. S

    Dangers of incorrectly installed boiler

    We are renting currently boiler in active for more than 3 weeks no despite landlord having 6 engineer visits It just stopped working had a fix lasted two weeks then off again. so know getting onto a 5 week issue. No current gas safe certificate in place boiler installed to low with not a enough...
  5. 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...
  6. O

    Washing machine installed correctly?

    Hi there, We have noticed a funny smell coming from behind our washing machine - on investigation it looks like the waste pipe is leaking where it meets a solid plastic U - now what I want to know is if this is installed correctly? The waste pipe runs downwards from the top of the washing...
  7. S

    New boiler - questionable install

    Hi, i have had a new boiler installed and they have left the property without completing full scope of works. Also have plugged the boiler into an extension lead on top of a toilet. (I will try and add a picture) Any advice if this is ok or not please
  8. J

    Vent pipe size for vented cylinder installed in 2005-6

    Hey, having searched this forum and last building regs (2000) from around that time... Any idea what the correct size is for a vent pipe for a vented hot water cylinder, gravity fed? I.e. the one that is continuously rising back up to the cold water feed tank for the cylinder? Have discovered...
  9. W

    URGENT New cartridge in but shower head still leaks.

    Just installed a new Moen shower cartridge. The shower head still leaks. What is causing this?
  10. 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...
  11. J

    W. Sussex - destrat pump to be installed

    Need somebody competent with pipework in awkward places to fit a destratification pump and appropriate nrv's to a dhw cylinder. Only the plumbing not the electrics
  12. J

    Unvented cylinder installed but no G3 qualification

    I had an unvented cylinder (and gas boiler) installed by a Gas Safe Register engineer. He later informed Gas Safe Register which issued me a gas certificate. But Gas Safe Register told me I should have a Building Regulation Certificate for unvented cylinder installation. But the gas engineer...
  13. 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...
  14. G

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

    Hi Folks, Has anyone got any experience of the Grohe Sense Guard? It's been on the market for several years but seems that there is virtually no feedback on it for the UK. So either it's so wonderful that nobody feels the need to complain - or maybe nobody has installed one........ I'm in a...
  15. J

    URGENT Installed Unvented cylinder will cause water pressure high?

    Dear all, I recently got a gas engineer installed a new boiler and an unvented cylinder & expansion vessel in my house, replaced the old boiler, vented cylinder and water tanks in loft. Just after a month of installation, last week, the house lost hot water, it was because the cylinder...
  16. H

    Wetroom shower glass installed on tray help!!

    Hi, just replacing the bath with a walk-in shower and so far so good, well almost!. I've installed the glass and as per instructions and only siliconed the bottom outside edge. However, I now appear to have a problem in that the glass has been knocked and the silicone has become unstuck from...
  17. S

    Hive thermostat recently installed. Ideal h15 boiler ..heating working but hot water is off

    I have got Ideal Heat H15 boiler and got Hive thermostat active heating installed recently by electrician. After multiple rounds the electrician managed to get heating on from the Hive thermostat. When the heating is on, boiler fires up and passes to the radiators. Pressing the Hot Water to On...
  18. J

    URGENT I have a nu-heat UHS installed in 2006. Recently I’ve noticed a dark orange coloured substance appearing in 2 of the flow

    Can anyone help me identify the cloudy orange contaminant and suggest a remedy?
  19. G

    URGENT Removal of baxi back boiler now i have installed a combi and no heat upstairs

    i have relocated the pipes from the old boiler and remove the hot water and heating expansion pipes i have used the hot tank pipes to fix a small rad in the old airing room removed the pump and connected the flow and return from the boiler 5 out of eight rads d/stairs work the rest nothing this...
  20. P

    “Boiler incorrectly installed” – insurance claim rejected.

    I have a leak in my leasehold flat in a small council 4 storey block of flats – 8 flats in total. In the corner of the bathroom is a cupboard where the soil pipe runs through each of the 4 floors on my side of the building. Within this cupboard there is a T junction taking the bath and kitchen...
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