We inherited a water heater rental from Reliance when we purchased our home. We needed a new furnace and air conditioner, and so had several companies come in to give cost quotes. Several of the companies noted that our water heater was not installed correctly and safely (it was improperly vented), and indicated that the water heater would therefore need to be replaced as well. Reliance charged us $450 to return the water heater, even though their policy as stated on their website is to charge only $105. The company that installed our new water heater removed the old one for us, and the Reliance worker was at our house for less than 5 minutes to pick it up. We complained several times that this charge was unreasonable, but Reliance refused to reduce the charge.
I would strongly recommend that you avoid getting a water heater rental with Reliance! They engage in unreasonable and anticompetitive practices, and have been fined $5 Million for these practices by the Competition Bureau (http://www.competitionbureau.gc.ca/eic/site/cb-bc.nsf/eng/03836.html).