My old rental tank was $39 every 3 months. Serviceman said I needed a new one but it would be $50 rather than $39 but I would save the difference in energy efficiency. I signed the contract. I am now billed $50 MONTHLY and am sometimes double billed. This company is disgusting. I'm going to buy out of my contract. I could own a new heater at that price. I'm furious.