Changing out a gas fired 40 Gallon tank type heater? Then no doubt the NORITZ EZTR40 bundle is ideal for you. To this upgrade "EZ", we put the plumbing on top to minimize piping modifications. We also included the required valve kit and 25' of flexible poly propylene venting that can be channeled through existing metal B-Vent, greatly reducing the time and cost required to change out venting. Equipped with a K-Copper heat exchangers this EZ Series heater is the most durable and efficient tankless heater in its class, .87 UEF. Remote control thermostatic (RC7651M and cord RC-CORD10/RC-CORD26 sold separately. Three important installation notes: condensing water heaters produce water/condensate and therefore require a drain (2-3 gallons per hour when running constantly); Tankless heaters also have electronic ignitions which require a 120VAC/60Hz power source; lastly, check with your gas provider to make sure you have sufficient gas pressure available for the unit you are installing. Now enjoy endless hot water and endless savings.