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Gas line to tankless water heater
My tankless water heater needs up to 200k btu- current tap to main gas is 1/2".
My existing line is 1/2" and will need to run about 8' from my main. Looking at flow charts, that's obviously not going to supply 200k btu.
Can I put a reducer in reverse directly at the T and run 3/4" pipe the rest of the way?
I believe the 2 or 3" of 1/2" pipe should be able to flow 400-500k btu, and 3/4" pipe for 8' will easily do up to 200k. What are the problems with doing this? Is it acceptable to use a reducer in reverse?