So much of this depends on specifics.

What was the size and model of your boiler and of your heat pump system? Not all heat pumps are created equal and they need to be sized correctly and installed correctly for your individual space.

Personally I’ve got a split level with 3 zones for the boiler and a 5-head mitsubishi low temp heat pump system. The heat pump does use a lot of energy when it gets cold as my system is slightly undersized for the heating use-case. A lot of installers still only think of these as air conditioners and seasonal heaters so they don’t size them properly for the full winter months.