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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. O

    boiler installed above the stairs?

    Hi guys, Been to look at a complete central heating install, its a tiny little flat and they want a combi installing, as space is limited the land lady has asked if the boiler can be installed on the piece of wall above the stair case/ on the staircase. i cant seem to find anything in the...
  2. M

    Magnaclean twintec.....rubbish!!

    Powerflushed a system yesterday with a 2 year old veissman vitodens installed on an old system with the twintec installed at the same time as the boiler. customer complaing rads wernt getting and hot water running hot cold hot cold but boiler fireing upto 100 degrees! Isolated boiler and...
  3. S

    Central Heating Advice

    Good Evening, Purchased a 1960's 4 bed semi in December 2011. Main family bathroom & on-suite upstairs both having showers installed. Downstairs has a W/C. The house is being fully refurbished and it has now come down to deciding on a new central heating system. Back in early January 2012 I...
  4. R

    Zone Central Heating Question

    We are looking to zone our central heating system into 2 zones. 1 for the central heating and one to heat the hot water tank via indirect coil. Do we need a auto bypass valve installed (all radiators have TRVs installed) when we move to having 2 motorised valves installed? We have a Worcester...
  5. C

    Shower temperature is too hot now combi boiler has been installed

    Hello, I am having problems with the temperature of my shower since I have had a new Combi boiler installed. The shower is a single lever mixer valve and I can no longer get the right temperature as the water gets too hot. Should I install a gate valve and reduce the pressure of the hot so the...
  6. quality

    Anyone installed one of these

    Baxi Ecogen I have a customer that's insisting they want one of these. To be honest I am not a fan of baxi but will fit whatever pays the wages. Any thoughts ?
  7. H

    Newly installed combi losing pressure

    We just spent £3k+ upgrading our old open-vented system boiler system to a new combi condenser boiler (Viessmann 30kw) system which worked less than a week before the pressure dropped to 0 resulting in no hot water or heating. The plumber came and topped up the system saying it was "just one of...
  8. H

    ferroli f24d cicruit board, cost £200 six months old never installed offers

    have for sale a ferroli domicpmpact f24 b /d printed circuit board, may fit other models, buyer will have to check.. can upload a picture if required. only briefly used to test my other board, as other one was ok, problem was something else.. offers.. can do paypal...
  9. N

    Does This Look right it has been installed by homebase ?? its in the airing cupboard

  10. J

    Boiler fumes

    A friend's neighbour has just had a new gas central heating system installed including a condensing combi boiler. The boiler has been installed in an upstairs bedroom cupboard with the flue terminal fixed flush on the outside wall approx 200 mm below the wooden boxed in section beneath the...
  11. T

    Installation requirements for Fatstrippa

    Hi, I have just seen 2 Fatstrippa's installed at a place I often work at and am surprised at the drains smell since it was installed. As it's the quiet season for the business the kitchens are not being used very much so the daily maintenance is not being carried out and I appreciate this could...
  12. B

    Water hammer after combi boiler installed

    Hi, I'm new here and would greatly appreciate some advice. We recently had a combi boiler system put in our late 1960s semi - We used to have a gravity system with conventional boiler that was sited in the kitchen on the ground floor but the new combi boiler is now upstairs in the airing...
  13. N

    Vaillant 630 System Boiler/Unistor Cylinder

    Hi evry-body. Virgin post (honestly). I have a Vaillant 630 System Boiler/Unistor Tank coupled with Acova Steel Column Rads installed approx 2009. Problem I'm having is the hot water is not hot and the boiler stops and starts. Everytime the water is heated the bathroom rad also heats up as...
  14. L

    Heatline Monza 24 cutting out

    I have installed a Heatline Monza 24 Combi which appears to be working correctly on the DHW mode. However when CH is called for the boiler fires up until the temp reading on the boiler reaches 65 degrees. The boiler then shuts off until the displayed temp drops to around 45 degrees. This cycle...
  15. H

    New Grant vortex condensing combi boiler not working

    We have just had a brand new CH system and Grant vortex condensing combi boiler installed. It worked on Friday night when the boiler man commissioned it but then it didn't fire up on Saturday and hasn't worked since. We have bled the oil, installed a new tiger loop, in case the last one was...
  16. S

    Realised this week that my boiler was not installed correctly

    I have a Potterton Suprima 120L (approx. 120,000 BTU) boiler which has been running for about 5 years. It has never been that great in heating up the rads in my house. I have 21 radiators in total. The boiler never fires for very long. Usually less than 2 minutes. I decided to read through the...
  17. N

    Anyone installed a Worcester 37cdi?

    I'm in the middle of fitting one of these, Everything has gone ok apart from the PRV. How does the the plastic bottle under the PRV connect to it? Is it simply a loosening the nut and pushing it up? :confused5::confused5::confused5::confused5::confused5:
  18. G

    Vokera Compact 25he cutting out

    Hi, I had a Vokera Compact 25 HE installed 3 years ago. Until now it has worked a treat. However it has started to cut out while on heating mode. It will run for 15 minutes then cut out. The hot water seems to be working ok as normal. I called the chap that installed it and he says it could...
  19. S

    Newly installed Boiler. Ideal 12

    Hello I had a new boiler installed yesterday. Ideal logic heat 12 When both the heating and water is on, it makes a terrible noise. Has anybody got any idea what this could be? If you need more details please let me know. thank you
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