Klover Insert 18 design changes

Klover have made a couple of design improvement to the Insert 18 wood pellet boiler, pictured here.

The pellet-loading drawer at the top of the stove is now behind a drop-down panel, as on the Insert 22.

Also, the display has been upgraded to the LCD version. Having this display and upgraded motherboard allows access to many more menus, such as:

- Function test on moving parts
- Memory and alarm counters
- Chimney settings
- Pellet settings