By Anne Cumming Rice

FORT LUPTON ? Harold Enander, founder of Vehicle Systems Inc., never dreamed his ideas for recreation-vehicle heating systems would fuel a multimillion-dollar company.
The company?s Aqua-Hot and Hydro-Hot products are sold to recreation vehicle manufacturers around the country and appear as standard equipment on several high-end RVs. In August the company plans to unveil a third system that will bring the same continuous hot-water benefits to lower-priced diesel coaches.
Vehicle Systems employs about 60 people at its 25,000-square-foot facility in rural Fort Lupton, where they design, manufacture, market, sell and service the heating systems for diesel-powered recreation vehicles.
Just over…