Provided that the radiators in question are sizeable, powerful devices, they can be considered to be one of the very best solutions to team with heat pumps.
As ground source and air source heat pumps both generally provide low flow temperatures, the surface area of the component used to deliver the heat will typically have to be larger than it would when working with a gas or oil boiler.
With that said, underfloor heating is another excellent home heating means for operation with heat pumps.
Further information can be found in our blog, Will My Existing Radiators Work With A Heat Pump?, or you can gain air source heat pump energy insights from the Energy Saving Trust.