Is it possible to use Webasto Thermo Top Evo heaters for just air warming? I have been given a unit but was not going to use it for hot water! Do you sell any extra bits i need for a possible conversion? Thanks!

The Webasto Thermo Top Evo is a diesel heater designed to heat water (coolant). You will always require to create a water circuit for this heater to work within. If you only require warm air to heat the cabin then this isn't the best heater to start your project with to be truthful. You can have warm air output from this heater by installing a blown air heater matrix into the water circuit, but this is more complicated and expensive compared to starting your project with a Webasto air heater, for example a Webasto Air Top 2000 STC