I purchased a Rheem Tankless hot water heater last summer. From day 1 the heater never worked correctly. After showering for 5 minutes, the water would become lukewarm, after 10 minutes the water was essentially cold. I adjusted the temper on the heater up a few times, but had to find a balance between "too" hot and not not enough. However, the problem continued to exist. Finally I called Rheem and explained my issue. They initially told me they would send out a service rep, but later came back and told me there were no reps in my area and I should obtain my own contractor to have the problem corrected. I did hire a local contractor who concluded one of the heating elements needed to be replaced. I purchased the element from Home Depot and had the contractor replace the old with the new heating element. I submitted a warranty claim via email to Rheem with the receipts, and all required information. Yesterday I received a letter from Rheem in my us mail stating they needed to contact the plumber for verification of payment, etc… and to provide his name and number. As well, the receipt from the contractor needs to include the company letterhead with phone number, etc. I called Rheem this am and explained that I included the contractor's name and number when I submitted the claim and they should call him for payment verification. As far as having the Company Letterhead on the receipt they should ask him to provide that as well. Their response was they will not call the contractor… So it's a wonder to me why I would provide that information to start with. Also, when I received the letter from Rheem in the us mail requesting the information above, the letter lacked to include the Letterhead information Rheem was requesting the contractor provide. As a result of the poor customer service, I would never purchase a Rheem hot water heater again and would suggest the same to friends and family as well as any readers of this review.