Expedition II Wood Insert Type_Spa Accessories The math favors the XL

The math favors the XL for any owner with consistently hard fill water

When both are too high

Cover the work area with a protective covering

Large metal stains may require repeat treatments

BTUs: Up to 78

Expedition II Wood Insert Type_Spa Accessories The math favors the XLOverview The Expedition II steel wood insert provides a great value for those looking for the easiest wood insert to operate. Powered by the Quadra Fire four point burn system providing an impressive fire that can be easily seen through the large 275 sq. in. cast iron glass door. Along with the Automatic Combustion Control (ACC), which gives you more air when you want it for easier start up or that extra boost of heat when needed. This is done