Hi, I'm currently adding a small toilet room in the cellar and I've purchased the Grundfos Sololift2 WC-1 for toilet and small sink. Before doing a full install, is it worth getting the PCB alarm for the unit (Grundfos part no. 97772315)? What are the benefits? And more importantly has anyone got one and has it been worthwhile / prevented a disaster? Cheers in advance.