Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Does this unit require any external venting?
Document: Fired up great and have been enjoying endless hot water ever since. Now what you've been reading for: As a general reference, with the bathroom sink about 30 feet away it will flush out the cold water and produce hot in about one minute. Shower head volume will give hot water in 30 seconds. I have had two rain shower heads running without a problem. Great unit, very satisfied.
Bought this as a direct replacement for an old MYSON 35. Installing it myself was amazingly simple. I mounted it to the wall, connected the water and gas lines (labeled all the lines before removing the old unit) left the 120V wiring to the professionals. When the plumber arrived, he checked and verified all my work as correct and without leaks, completed the electrical wiring and fired it up. Installing it to the point on electrical wiring and firing it saved me a good amount of monies in professional labor.
takes 15 seconds to get warm (at nearest point,) and only 30 before it's too hot to touch. I have been going through approximately 1/4-1/3 of the propane by switching to this water heater. I would buy again in a heartbeat and I would recommend to anyone. Also was really easy to install. Was installed in less than an hour, but we read directions and got all materials prior to installation.
Answer: no