Installed base: the stock that outlives the sale
Why the installed base is a manufacturer's cheapest growth market.
The installed base is the sum of all devices, machines and plants a manufacturer has in service with customers. It is almost always larger than annual unit sales and it outlives the sale by years or decades. Read it as an asset rather than a legacy burden and you find demand whose acquisition cost has already been paid.
What the installed base is
The installed base covers every unit a manufacturer currently has in operation with customers — regardless of when it was sold and whether a contract still exists over it. An appliance maker selling two million units a year, with an average service life of twelve years, has an installed base in the order of twenty million machines. Annual sales are one tenth of the stock.
In plant engineering and machinery the ratio is more extreme still, because service life runs to twenty or forty years. Every one of those units produces maintenance, spare parts, faults, retrofits and consumables over its life — and eventually a replacement decision.
Why it is economically so valuable
Demand from the installed base costs no acquisition. You know which machine is standing there, you know the address, and you roughly know when it will need what. In new business you have to manufacture all three of those expensively. That is why service margin in many industries sits well above equipment margin — and why, at manufacturers who report their service segment separately, that segment often carries the majority of the profit on a minority of the revenue.
On top of that comes the defensive effect. The installed base is physically standing at your customers' sites. A competitor cannot poach it overnight — they have to wait for a replacement decision. That moment is exactly where it is decided whether the stock was a lead or merely a delay.
Why it usually stays unused anyway
Three reasons keep recurring. First: the manufacturer does not actually know what is out there — serial numbers, variants and locations sit in different systems or nowhere at all. Second: the customer relationship belongs to the channel — the dealer, installer or service partner — and the channel releases neither contact nor data. Third: the service function is run as a cost centre and steered by cost per case. Measure that way and you optimise effort while systematically failing to see revenue potential.
One caveat that gets overlooked
Never assume your installed base matters to your customer. It is your asset, not theirs. Their entry point can be something else entirely — an adjacent product, a consumable, a use case. A value read on the installed base therefore has to answer two questions separately: what the stock is worth to you, and where your customer actually enters.
Table of contents
The installed base is the sum of all units a manufacturer has running at customer sites. It is larger than annual sales, outlives the sale, and carries demand whose acquisition cost is already paid.
FAQ
What does installed base mean?
The installed base is the total of all devices, machines and plants a manufacturer currently has in service with customers — regardless of when they were sold and whether a contract still exists.
How do you calculate the installed base?
As an approximation, annual unit sales multiplied by average service life, corrected for failures and early replacements. It only becomes reliable through serial numbers, registrations, service events and spare-parts movements.
Why does the installed base matter for growth?
Because demand from the stock carries no acquisition cost: known machine, known address, foreseeable need. That makes it a manufacturer's cheapest growth market — and the most defensible one.
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