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Heating system maintenance: advantages, intervals, costs, maintenance contract

Smooth operation of a Viessmann heating system is the be all and end all. This is the only way to ensure that the components interact optimally which increases the efficiency of the system. Depending on the type of heating system, it also means that fewer resources are used. In addition, you can save on heating costs in this way. However, it is not uncommon for the maintenance of heating systems to be neglected. We explain how heating system maintenance works, provide information on the subject of costs and what you should definitely look out for if you want to have maintenance carried out on a Viessmann heating system.

Why you should have your Viessmann heating system serviced

Basically, maintenance of your heating system consists of two components – an inspection and the servicing itself. Both steps are carried out by one of our qualified trade partners. First of all, they will determine the current condition of the heating system. They then derive courses of action from the results. The maintenance work ensures the intended condition of the Viessmann heating system.

Individual components may have to be replaced. This is called corrective maintenance, which restores the target condition. After the inspection and corrective maintenance work have been carried out, you will also receive a maintenance report for your Viessmann heating system. All the work carried out is listed in it.

You can find information about a fault in your Viessmann heating system in the guide What to do in the event of a fault?

What is checked when your heating system is serviced?

When your heating system is being serviced, the following aspects also play a role in addition to checking the current condition:

  • Checking all connections on the heating water and domestic hot water sides for leaks
  • Measuring static and supply pressure
  • Checking the burner seal and burner gauze assembly
  • Checking and adjusting the ignition and ionisation electrode
  • Cleaning the heat exchanger
  • Checking the condensate drain and cleaning the trap
  • Checking the neutralising system (if present)
  • Checking the expansion vessel and system pressure
  • Checking the safety valve function
  • Checking the electrical connections for firm seating
  • Checking the combustion quality
  • Checking the flue system for unrestricted flow and tightness
  • Domestic hot water supply including temperature setting, tightness and general proper functioning
  • Function and adequate settings of the heating system pumps such as heating circuit, cylinder charging and domestic hot water circulation pumps

The individual factors can vary depending on the type and model of heating system. For example, completely different factors play a role with a heat pump or a fuel cell than with a gas condensing boiler or a classic oil boiler. Basically, the last step is for the installer to call up and reset the service indicator.

Reasons for heating maintenance

  1. Avoid high heating costs due to contamination
  2. Ensure the safety of the residents
  3. Extend the service life of the system
  4. Maintain energy quality
  5. Retain warranty (for new systems)
  6. Prevent environmentally harmful exhaust gases from uncleaned systems 
  7.  Prevent sudden heating failure
  8. Ensure that insurance covers the costs of consequential damage

Legal requirements for heating system maintenance

In terms of legal requirements, two aspects must be taken into account: the flue gas values according to the German Immissions Act (BlmSchV) and the regulations of the  German Energy Act for Buildings (GEG). Especially in the case of boilers for gas, oil and wood, which operate with combustion, the limits for flue gases and thus pollutants must be observed.

In addition, EU directives provide for regular testing. The responsibility for this lies with the system owner. This is stipulated in the GEG. Special mention is made of section 11 which deals with maintaining energetic quality. It states that components with a significant influence on the efficiency of the system must be maintained regularly. However, time intervals or exact dates are not specified.

You should have your heating system serviced regularly

A heating system runs at full load for three to five months of the year. Therefore, heating system maintenance should be carried out regularly. However, there is no statutory time requirement. In any case, a good time for servicing a Viessmann heating system is summer. If it is already permanently warm very early, late spring is also a good time. In any case, you should have the heating system serviced before the start of the next heating season.


What costs can you expect for heating system maintenance?

Heating system maintenance incurs costs. But there are no unit prices and flat rates. This is because the cost depends on a variety of factors such as

  • heating type
  • scope of the work
  • local conditions
  • adequate settings
  •  spare parts or replacement of wearing parts, if necessary

In particular, the follow up services of heating system maintenance cannot be covered by a flat fee. In some cases, wearing parts may also have to be replaced by a contractor in the course of maintenance. All these additional services count towards heating system maintenance and thus determine its price. Due to this complexity, it is not possible to specify flat fees for heating system maintenance here; costs can only be determined individually.

Maintenance contract: The advantages speak for themselves

An individually drawn up maintenance contract for the heating system can save costs. Our trade partners will grant you more favourable terms for regular maintenance. Having a long term agreement lets both you and our local installers calculate costs more easily. We describe how to find the right installer for you in the article Finding an installer.

You do not have to compare offers or renegotiate services every year. Another advantage for you when you take out a maintenance contract with one of our specialist partners is that you will never forget the service date again.

Finally, you can specify custom services in such a contract. This way you get a package that is tailored to your needs.

Content of a maintenance contract: What you should look out for

When negotiating a contract for regular maintenance of a Viessmann heating system, you should pay attention to the following items:

  • services to be carried out including description
  • costs including work on holidays and weekends, plus travel to and from the site
  • time frame and maintenance interval
  • contract term and notice period
  • clearly worded assumption of liability
  • costs and conditions for emergencies and accidents
  • Optionally, you can also agree on a time limit for rectifying faults with the installer.
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