I have been searching and searching for the actual dimensions of these 2 units and cannot find them. I have an IC20 now on a ~23k pool/spa and the unit is getting old and will probably need replacement by the end of this year, maybe before. It should have been an IC40 from the get go so I'm wondering if the units are the same length or different? I'm thinking they are the same but don't know for sure. I appreciate all the help this forum has given me in the past.