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We were at the Wolf-Heiztechnik stand at #ISH2017. Here they show how easy it can be to carry out maintenance on a Wolf CGS-2 condensing boiler. Regular maintenance by a specialist company is a prerequisite. Please do not try this at home, maintenance may only be carried out by a specialist company. I was very amused by the performance, see for yourself. Have fun www.derwerkmann.de This video, which I produced myself, has been published here with the permission of Wolf GmbH. http://www.wolf-heiztechnik.de/