600 reliable Technical Assistance Centers, 7 days a week The quality of our 600 Authorized Technical Assistance Centers is certain. We have selected and tested them over years of activity, they work with professionals trained in our courses and on our products, followed by a team of 50 Immergas experts. Furthermore, we have ensured that our TACs are available quickly, especially when the climate is harsher: in fact, in the months from October to February they are available 7 days a week, even on Sunday mornings.