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The exoMAX pro are regular boilers. Regular boilers are also known as open vent boilers beause they are linked to an outside vent. The system provides central heating and hot water by using both a storage cylinder and water tank, which gives ultra-efficient operation. Due to the open vent they are not pressurised.

This boiler was manufactured in 2003 and is not currently in production.

A broad range of Vaillant thermostats and clocks are available. You can find technical help on these by typing in your model into the question bar above or by browsing through our homepage here.

This boiler is normally connected to system that has an open vent. This means these boilers are not pressurised. If your heating system has undergone a conversion and the water tank has been removed then this boiler may be pressurised. Please contact your Installer for more information on this type of system.

Your boiler should work reliably for a number of years if it is serviced annually, however occassionaly faults can occur. In a lot of cases faults can be temporary and if the boiler is reset it will start working again. You can find out how to do this by selecting the user manual below (under available literature). We have created a special troubleshooting guide which you can access by clicking here which may help you resolve the issue. If you continue to experience problems please click here for contact information.

If you are a suitably qualified Gas Safe registered Engineer you can access our comprehensive technical help section by clicking here.