Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Can this unit be used with propane instead of natural gas?
Document: I installed the unit to replace a gas direct vent tank. It works perfectly and has decreased our gas use almost in half while not limiting the use of hot water for bathing, dishwasher or clothes washer. We have a small house with short runs.
This is not a problem for the bath or washing machines, but for a quick spurt of hot water for a hand wash, it can be an irritant. This is a more prevalent issue to get used to than the &#34;cold water sandwich&#34; effect that in my opinion is not much of an issue (clearing the heat exchanger of cold water represents much less time and water than clearing the hot water supply line if it has been sitting and gotten cold).
We replaced the very small hot water tank in a cottage. Works great, easy to increase temp, now that winter is here, and endless hot water. This mid size unit is perfect for our needs. I will never by another tank unit again.
Update Dec 2013:The missing items are no longer sent with the unit. You have to purchase them separately which is not a problem, it's just that it indicated that they came with the unit. I ended up not using the drain at all and simply drain the condensate out the vent.....which it's designed to do anyway.I had the heater installed by a contractor and it works great.
It includes its own temperature adjusting thermostat.The unit fires up quickly and very quiet, depending on the temperature set, the unit is not hot to touch, partially warm, at least from the inside.Once hot water is not needed, unit shuts off instantly. I have two bathrooms, plus kitchen, no struggle keeping the warm/hot coming. *Pictures will be posted soon*
It comes with a water temperature stat which is also nice.I would also recommend using the Rheem RTG20220AB Service Valve Kit. It makes installation much easier and already has a port for the Rheem AP12993C Pressure Valve which you will need.The Rheem RTG20210 3/5-Inch Horizontal Termination (Vent) Kit for RTG-95DV is a must for this unit and has the necessary 94 degree pitch.
Mount on a stud(s), recommended.Once the unit is mounted, proceed to install piping as necessary. I went the PEX route rather than Sharkbite, just personal choice, solid copper lines are also an option too. Your choice of valves, I went with Rheem Service Valve Kit with Pressure Relief Valve(RTG20220), that way I can clean the unit with the flush kit (RTG20124), includes pump, piping and a bucket.
*UPDATED* 08/25/2013I just installed this unit today, took me two days to complete due to the pipe size complications.Instruction manual states 3/4" piping for efficient flow, but since the house contained 1/2" existing piping, I have no pressure or flow problems.I installed the exhaust venting first then mounted the unit, the venting is a concentric 3" center by 5" outer tubing.
Since the low-profile venting comes with a fire shield ring, you can replace it with a square version if you want, I chose to use the low-profile fire shield ring. I decided to cut a 6" hole with a hole saw, even though the venting is 5" I wanted that extra room just in case. Make sure to clear out the wall insulation to prevent fires and don't forget to caulk around the outside of the house. The unit has an adjustable mounting bracket(s).
The outgoing gases go out the 3" pipe and the make-up air come around it in the 5" pipe. We just had several days of below zero temps and the vent pipe became cased in ice, would then melt inside and I didn't want water going into the heater. Wrapping the vent in insulation took care of that issue.
Answer: yes