How Does an Aerotherm for a Greenhouse Work?

[WisteriaLane]

Does any of you know how an aerotherm for a greenhouse actually works? there should be a heating element (boiler?) and a fan distributing the heat. Are they actually used for greenhouses? The fact is I'm translating some gerdening-related stuff from EN to ITA and I'm a bit confused.... Thank to whomever is willing to/can help.

[wingdesigner]

Hi, Max! Welcome. You might want to re-post your question in another forum, like the permaculture one, or something more closely related to the topic, it'll get better coverage there.