I was having problems with a tankless hot water heater in my rental property. I had contacted a couple of other businesses before calling Armstrong. One told me (after coming out to look at it) that I would need to have a larger gas line and I should just move the unit. This would have cost me thousands of dollars. One company wouldn't even come out and said they don't work on 10 year old units. I found Armstrong and was amazed at how much money they saved me and saved my hot water heater! They were in constant contact with me and my renters. They gave me advice on how to care for the unit and my cost was well under $1000.00! I will go back to them in a heartbeat!