Why systems deteriorate quietly
A newly commissioned system is in the best condition of its life: balanced, hydraulically adjusted, cleanly parameterised. What follows is a quiet decay — not of the components but of the settings. Uses change, rooms are repurposed, setpoints are raised in response to a complaint and never lowered again, filters block, pumps continue on the wrong curve.
The insidious part: the system keeps working. It merely becomes more expensive to run. Without measurement this goes unnoticed for years — until the service charge statement prompts questions.
What regular maintenance actually delivers
Operational reliability. Wearing parts are replaced before they fail. A heating failure in January is not merely uncomfortable; the emergency costs far exceed the maintenance effort.
Efficiency. Clean heat exchangers, correct flow temperatures and functioning controls act directly on consumption. With heat pumps especially, every degree of flow temperature is visible in the seasonal performance factor.
Service life. Systems operated near their design point cycle less and age more slowly. Frequent switching is among the biggest killers of heat generator life.
Legal certainty. Documented maintenance is the basis on which warranty and insurance claims can be asserted at all.
Maintenance is not operational optimisation
The distinction is frequently overlooked. Maintenance keeps the system functioning: changing filters, checking seals, testing safety devices. Operational optimisation keeps it efficient: adapting control strategy, operating times, setpoints and hydraulics to actual use.
A conventional service contract normally covers only the first. Anyone who wants to keep efficiency in view needs periodic optimisation as well — usually based on monitoring across at least one heating season.
Hydraulic balancing: the step most often forgotten
Without hydraulic balancing some circuits are over-supplied and others starved. The typical response is to raise the flow temperature until even the last room warms up — with corresponding excess consumption throughout the building.
Balancing is therefore not fine-tuning but a precondition for economic operation. It belongs to commissioning and should be repeated after any material change to the heat distribution.
Which intervals make sense?
Fixed figures would be unserious — intervals depend on plant type, manufacturer requirements, intensity of use and ambient conditions. As orientation:
- Manufacturer requirements are the floor, not the optimum
- Ventilation filters follow contamination and pressure differential, not the calendar
- Safety-related inspections follow their own regulations and tolerate no deferral
- An efficiency check once a year after the heating season is money well spent in most properties
More important than the exact interval is that maintenance is documented and that somebody evaluates the findings. A service report nobody reads prevents no failure.
Documentation: the quiet precondition for everything
Older properties frequently lack plant documentation — schematics, as-built drawings, settings, records. Without that basis every optimisation is guesswork, and in a replacement case the system must be surveyed from scratch at considerable cost.
The cheapest moment to catch up is the next measure that is happening anyway. During condition surveys we record the relevant data systematically — a by-product that saves real money later.
Conclusion: measure first, invest second
Before components are replaced it is almost always worth examining operating data and settings. Frequently the system is not at the end of its life but simply operated incorrectly. That insight costs a fraction of a replacement.
We survey existing systems in a structured way and prioritise measures by effect per franc invested — more on our analyses or get in touch directly.
