NO!ideal response is 23 and the ecotec pro 28 is 25, would i notice the difference or not?
On the hot water side an Ideal Response 120 is 35kW
(less on CH perhaps)
Water flow at the same temp is proportional the kW.
For a shower 24 is ok, for filling a bath the bigger the quicker.
Minimum about 30 I'd suggest.
Even with 35 (or 42...), running both together is a stretch.