Heaters running on electricity and toasters are one hundred percent efficient, meaning they produce as much heat as they absorb. Heat pumps, however, have efficiencies of up to 300 %. They do not generate heat. Instead, they absorb them from the outdoor air or ground and distribute them to colder regions indoors.
Heat pumps, therefore, use less electricity, yet they produce heat effectively. For instance, a ground source heat pump can consume 1kw electricity and deliver about 4kw of heat. Since heat energy is freely available, they are more efficient than other heating units. Using them means you get to reduce heating bills by almost two-thirds.
Further heat pump efficiencies are dependent on the price of fossil fuels vs. that of electricity. The cost of fossil fuel is high and comes with the hazards of hydrocarbons. Again, if you are using pool heat pumps, you have an additional advantage. When your house is cooling, your pool gets heat in return.
It saves energy that is used for heating the pool independently, hence reducing energy bills. Again, you won't install a heat pump in a house that's not well insulated. Insulation means less heat exchange between the exterior and interior air, which minimizes any chances of heat wastage.