[distances]

Maybe everyone should just point out that it's now the preferred heating method in all of the Nordics. If heat pumps work there reliably, it clearly is a proven technology.

As a disclaimer, if you have an air source heat pump in a very cold environment you do need a backup heating method too, like direct electric or just a fireplace.

[Symbiote]

I don't know about official policy, but I think in Denmark district heating (fjernvarme) is still the preferred option where it's available.

Copenhagen's system is enormous, covering most of the city. It's powered by 69% biomass (wood and straw), 16% renewable waste, 8% non-renewable waste, 4% oil, 3% gas, 0% coal.

[PDF in English] https://www.hofor.dk/wp-content/uploads/2016/09/district_hea...

[Danish page] https://www.hofor.dk/privat/fjernvarme/bliv-klog-paa-fjernva...