In theory nothing is holding you back to use the system for heating your entire house.
Especially when your central heating is already using low temperature water (40C instead of 80C) it would be doable. the 2kW element doesn't need to output 2kW, it is just capable of doing so in certain conditions.
In your current design you intend to heat all the air leaving the HRV. So the same temperature air will go to the bedrooms but most people like it a bit cooler there than in the livingroom. Also you don't need to heat those rooms all day when nobody is there.
You could place the heating element in the ducts toward your livingroom/kitchen and just ventilate the rest of the house with cooler air.
Would this be the only source of heat or is it intended to assist your main heating?
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