For sailing in cold climates we purchased a 8kw diesel heater. Installation went smooth and the unit works perfectly ! Withing about a Year, we had one time to replace the lighting and the unit restarted immediately ; We think it might be because we use it actually too often at the lower level, not being yet in very cold climates of our next project. For security, we purchased a second identical unit to be able to swap it out and repair quietly. We also stocked few parts as spares.
In overall we are quite happy about this unit !