An after-heating element is often installed if you want to be able to control the supply air temperature. A low supply air temperature may, at times, feel like a draught. By ensuring that the supply air temperature does not fall below a certain level, you achieve a good, comfortable indoor climate.
Electrical after-heating elements for all VPM/VPR units are factory-installed. It is therefore important to establish whether or not you require an after-heating element before you order the unit.