Depends on operating regime, but newly installed pumps typically are used in a way that gets close to 3. You can generate electricity with a gas power plant at

Depends on operating regime, but newly installed pumps typically are used in a way that gets close to 3. You can generate electricity with a gas power plant at 50%, use that to operate heat pumps, and you will warm your house more than directly burning the gas. Or put another way, in a gas dominated grid, switching from gas heating to heat pumps saves carbon gas emissions.