The biggest differences between the Hydro-Hot and the Aqua-Hot in that time frame is that the Hydro-Hot only has two heating pumps, versus three on the Aqua-Hot, may or may not have a basement heater and has a six gallon hot water coil versus a 12 gallon hot water coil on the Aqua-Hot. I am surprised to see that CC used the Hydro-Hot in that model, but they knew what they were doing so I would not sweat it. I think you will have plenty of heat. You will probably always have to use the diesel when you take a shower versus being able to have enough hot water for a shower using electricity on the Aqua-Hot. My only experience is with the Aqua-Hot.
2003 Beaver Patriot
2014 Honda CRV Toad