User Manual
11
- All venting must be done in accordance with local codes and regulations. Local building
codes from city to city and state to state will vary. Some jurisdictions may allow venting
material not allowed by other jurisdictions.
- ALL jurisdictions in North America allow for Z-Vent material to be used for venting tankless
hot water heaters. The condensation of a tankless water heater is slightly more acidic than
that of a standard water heater. Z-Vent is double walled stainless steel vent pipe made
specically for venting tankless heaters. Z-Vent is intended for lifetime use and will never
corrode or rust.
- Z-Vent material is available at most home improvement stores, and can be found at many
online retailers as well.
- SOME jurisdictions in North America allow for B-Vent to be used. B-Vent is double walled
galvanized vent pipe made for standard water heaters and stove vent pipe. B-Vent is not
lifetime material and will eventually corrode after extended use. Before deciding what
material to use, you MUST check your local building codes to see what is allowed in your
jurisdiction. If you choose to use B-Vent, you MUST check it at least monthly for corrosion and
replace vent pipes immediately if corrosion is detected.
- Diameter of the vent pipe is 5” for 16L unit. Vent pipe attaches directly to the unit in 16L model.
- Through wall installations: Use (2) 45 degree elbows, (1) piece of straight pipe no longer
than 18” in length, one piece of straight pipe no longer than 42” in length, one wind/rain cap
and one condensation drain.
- From the outlet at the top of the water heater, attach the rst 45 degree elbow with a vent
pipe coupler to secure it to the unit. Once the elbow is attached, use it as a guide to cut a hole
through the wall at a 45 degree upward angle, at a slightly larger diameter than the outlet
pipe. Install the 18” piece of straight pipe to the 45 degree elbow and pass it through the hole
in the wall. Note: If the overall thickness of your wall exceeds 18”, the length of the rst pipe
can be extended up to 24”. If this is the case, reduce the length of the second pipe to 36”.
Total venting distance should not exceed 60”.
This kind of damage will result in water running freely into the space where the water
heater is located, with can cause ooding. If your water heater is installed in a
geographic location that sees very low sustained temperatures, you MUST install a
backow preventer on your heater's vent pipe. This will ensure that cold air cannot fall
down into the water heater and cause freezing damage. Damage to the unit or
residence caused by freezing is not covered under warranty and responsibility for
this type of damage is disclaimed by Marey Heater Corporation.