Tankless coil compatibility is uncommon in ultra-modern furnaces; heating home water separately avoids complexity
https://www.mediafire.com/file/b67h42v2xc6fkvw/pdf-83757-39345.pdf/file
Tankless coil compatibility is infrequent in state-of-the-art furnaces; heating household water one after the other avoids complexity and helps handle overall machine quotes.