The thought of installing and completely changing your heating system is daunting. If the process worries you, then Noritz EZTR40 is the perfect unit for you. This tankless water heater uses natural gas and is specifically designed to easily replace your old, traditional tank heater. Installation is fast and simple. No renovations are needed as you can use your existing pipes and foundation without making changes to your HVAC system. To save you time and money as well, it uses half inch gas connection lines. The EZTR40 has top mounted water connections, unlike most tankless heaters. This allows you to reposition the water lines used by your previous tank without issue. The EZTR 40 offers you more reliability than a traditional water heating system does.