I have just joined this community because we are considering

I meant to add..

... we have viewed online.

For what it's worth...

It depends how often you will use it and the type of property. If a second home then I would consider bottled gas for main heating and hot water and a pellet burner as a supplementary for the main room. You are then not paying for an installation like solar from which you would get a limited return. Air source heat pumps are becoming popular because they also act as air coolers in summer. We run bottle gas and will likely swap the aircon unit to a heatpump as can use existing wiring and plumbing. Piemonte is colder so a pellet burner might be better as a secondary source.