Reliance Home Comfort

As a rental customer I feel completely ripped off and dissatisfied with Reliance. I rented a Quietside Tankless water heater from your company, it has broken down twice in 2 years and I've lost hot water as a result. I called Reliance, had a service technician from Encore come out and tell me that it would need to be replaced due to a faulty water sensor. He could not order a new part because the unit is now discontinued so I was told I had to replace the entire unit. I was told it would cost over $1000 to replace because of the home infrastructure and the fact that I had 25ft of ABS piping running through my garage. It was replaced with a Rinnai over 2 weeks later, they changed 5ft of the piping and still charged the same amount. About a week later, I had to get another repair tech to come by because it was improperly installed and the new unit was leaking everywhere. What are the benefits of being a rental customer again? When this new Rinnai system breaks down in another 2 years and I find out the unit is discontinued, will I have to go through this process again? As a renter, all of these charges should be covered. Why are you penalizing your customers for renting bad products you chose to represent, and why do you give your customers the false sense of "comfort" that our equipment will be repaired if it breaks?