But I hear ya! You have to weigh the cost vs. practicality in many instances. Not to defend the price of a tankless water heater, but it’s not just the cost of propane that fits into the formula. Less weight prolongs the life of RV tires, suspension components, etc. No tank eliminates maintenance costs. How far, how often you travel factors in, as does convenience. Some families might run out of hot water frequently if traveling extensively or living full-time in an RV. Endless hot water on demand just might be worth the extra cost for a family. Retail purchases, therefore, can be a very subjective decision. One of the great things about the RV industry! At least now you know why I don’t list prices in my product reviews!
I would suggest you download the installation instructions and take them to your local RV service shop. They’ll be able to provide you with a more accurate estimate after they read through the instructions and inspect your coach.