Easy to install, very reliable and very hot! I purchased this item to replace an old gas 50 gallon heater that began to fail. It installed both quickly and easily into the same area as the old water heater using the same gas connection. I would recommend self installation to anyone who is mechanically inclined. This being my first major plumbing job, I used push fit connections that were available at local hardware store. This sped up installation and did not require any sweating and soldering of the existing pipes. Unfortunately, the special stainless steel pipes required for venting are not available locally unless your application is venting directly through an exterior wall... Order these online at the same time. Also, this heater requires a service valve kit and an electrical outlet to be near.