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Solar module efficiency is what, about 20% at best? Thermal is more like 60%. This means less roof area needed on a house that doesn’t have a lot of solar exposure.
So anything above a CoP of 3 and you need less area. That’s pretty doable these days. Maybe read up on how heat pumps work first before making assertions.
Also you can totally store hot water from a heat pump.
The main disadvantage is cost and complexity.
Most countries Primaries don’t exist at all. Getting to choose who represents a given party is a luxury.