The most important thing to consider when replacing your water heater in Kansas City is to determine the need for a Pressure Regulating Valve and Thermal Expansion tank. The picture below shows both the PRV and expansion tank just to the left of the water heater. These two devices work together to help protect your entire plumbing system.
It’s also common to replace a section or all of the venting. Most homes do not have the right vent sizing for a 40,000 btu water heater. It’s also common to see a single wall wye instead of double wall and 30ga vent pipe being used instead of 26ga.