Yeah. I’m aware of that but I think even the ITS probably becomes less efficient closer to 70 but the advantage being you don’t need to get it so hot anyway.
I wanted to go with the ITS but I’m not fond of suppliers dictating to me that I have to use their approved installers or take a hike even after I told them that I wanted to do the install by myself. They also marketed the diverter valve as such a great patented solution but I found most manufacturers recommend the same. I did out of interest get a quote from an ITs installer and it was around 6-7k just for standard install which wasn’t going to work for me as my pump is about 5m up.
I decided to take a hike and went with the alliance instead. Honestly, there isn’t really anything complicated about installing the heatpump. It’s a lot easier than installing an aircon.
The alliance works pretty fine and I only use it early mornings or late afternoon when the sun isn’t up. During the day I just use my element on max to get the water to 65 degrees. My thinking is that the heatpump has a limited life with all the moving parts in it. This hopefully will extend its life. The HP itself was just under 11k which was considerably less than the price of the ITS before installation.