Here is the closest model boiler/heater I could find to the Alde 3010 unit outfitted in the European Airstream models:
"The unique Alde "Compact 3000" boiler combines a heater and water heater in one unit. the Compact offers dual fuel operation using either LPG propane with an output of 5.2 kW or mains electric power with an output up to 3.15kW.
A cylindrical heat exchanger combines both heating and domestic hot water requirements ensuring there is always hot water available for showers and washing.
Installation is made very flexible by the design of the boiler which will fit easily inside cupboards, under a bunk or seating area. The Compact is a fan assisted balanced flue boiler and there are two terminal choices, side/wall mounted or top/roof mounted.
Heating is provided by a heat transfer fluid passing through a convector/radiator system via a 12v
pump mounted in the feed and expansion tank.
The boiler is manufactured in stainless steel and aluminium."
Also, here is a direct link to the European Airstream site.