I know everything about that boiler and there are better boilers around that are far cheaper as well. I said "Very expensive for what it is, massive on the wall and poor flow rate once the 15 litre tank is empty."
The Worcester-Bosch 440 and 550 are superior although washing machine sized. The Ethos 54C beats the hell out the 937.
You are bitter because you paid too much and bought a models with poor DHW performance to others.