They are very expensive by the time you purchase it and pay to have it installed. If you were in the market for another coach, I would say find one with it. We love ours in our Country Coach. Continuous hot water and hydronic heating keeps the coach nice and warm. Runs on diesel. We still love it although we have had several major repairs done on it. For more info check out: www.rvhydronicheaterrepair.com Roger Berke might be albe to provide more info. You can also call Aqua Hot Sales for pricing. Be sure to be sitting down. They also now have an LP model.