Hi David
Thank you for your comment. The Bailey Advance range uses the Whale 8L Rapid Heat Water Heater which is not the product outlined in the article above. Using a Whale Space Heater together with the Expanse Water Heater is approximately the same weight as the product you refer to. However, you are correct that due to the underfloor installation of both products, considerable internal space savings are achieved and gives the manufacturer a blank canvas to create their vehicle layouts without the heating system limiting their decisions.
Thanks
Hayley
Marketing Executive, Whale