Leaking Heat Exchanger Replacement of a Noritz NR98OD Tankless Water Heater

How to replace a leaking heat exchanger on a Noritz NR98OD outdoor tankless water heater. This 4.5 years old tankless water heater had developed a heat exchanger leak. Luckily most tankless water heater manufacturers warranty their heat exchangers for 10 to 15 years. In this case, Nortiz has provided us with a new replacement heat exchanger, blower fan, and a gas manifold. If you wondered what it will take to do this work yourself, please watch this video.
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Tools needed for this procedure:
1. Screw Driver with Magnetizer - amzn.to/3JSdzgi
2. My favorite pliers sets:
Single Pliers Medium Size - amzn.to/3sZfwBc
Two Pliers Set, Medium & Large - amzn.to/3znkMQC
Three Pliers Set, Small, Medium & Large - amzn.to/3pMuyII