The installation took about an hour as the unit had to be hard wired that was the longest process. I am not sure if you need to make any upgrade to existing setup as long as the BTU is the same. If you upgraded to a higher BTU you might need to increase the incoming pressure with your gas provider and maybe update the meter.
How long to install a replacement of the same model and do you have to do any modifications H250FDN 2016 model for new model 2023 model
The installation took about an hour as the unit had to be hard wired that was the longest process. I am not sure if you need to make any upgrade to existing setup as long as the BTU is the same. If you upgraded to a higher BTU you might need to increase the incoming pressure with your gas provider and maybe update the meter.