BEWARE Tankless water heater nightmare! This drama lasted so many months, I will summarize by saying we had Holtzman install 2 gas Navien tankless water heaters. We're not angry over the fact that they could never get the almost $7,000 system to function properly, and we're not angry that we bought it for an expected houseful of company only to have to explain then (and every time we have visitors) that the water won't heat steadily and properly. We understand that things go wrong and that just happens sometimes. As long as they were trying to service it and make it right, we were patient and appreciative. They repeatedly misdiagnosed the problem (i.e. once telling us the problem was our old faucets (?) without knowing that all our faucets are new/had recently been replaced, another time saying it was our well...) But the *horrible* part was they ultimately left us high and dry, $7,000 in the red with a non-functioning system!! We couldn't believe it. The way it went down at the end was like this: they had promised (in writing) to make a final switch of one of the two systems to rule out equipment malfunction. On the date of the appointment, they didn't show up. When I emailed later to ask if I had the date wrong, the manager wrote me this: "I’m sorry. The day we were switching out the water heater is the day it snowed and we didn’t run any company vehicles that day. I will get in touch with you Monday to reschedule." Monday came and went and I didn't hear from him. When I emailed to inquire, he sent me the following email: "I was with the owner last week on a business trip and he asked about your situation, I explained to him what was going on and what we’ve done up to this point and he does not want to switch out the other water heater. He feels that we have done everything possible and the problem is in the well and faucets. He said he would do the switch out if you are willing to pay for the service call to do so." I was stunned. Over the 5 months since they installed our $7,000 system, they knew it never functioned properly yet they disavowed responsibility and wouldn't even see through the troubleshooting they promised to do in writing. I called Navien and they said there's nothing they can do, that they just make the systems. They did offer to refer me to a more experienced Navien installer. This different company that I had to hire at my own extra expense came and fixed the problem on one visit. It wasn't the well. It wasn't the faucets. The bottom line is: you can spend $7,000 with them and they won't even make sure your system works, even if they promise to do things in writing. I'll add I was even more surprised because we were so patient and nice about the whole fiasco along the way (maybe that was a mistake?) and because we have been excellent customers for years with a propane gas account and were responsible for encouraging many neighbors and friends to switch to Holtzman for propane gas. As a result of this disappointment, we purchased our 1000 gallon propane gas tank from them (even though it was expensive) so we could switch companies and no longer patronize Holtzman. Very poor business model; not only were they dishonest but, as a result, are going to lose more money from our account than they tried to save by not servicing the systems they sold us. I would stay away from this company and not believe them if they state (even in writing) that they will stand behind their work or products.