INSTALLATION GUIDE
Gas Tankless Water Heater Venting Explained
Indoor gas tankless water heaters need a model-approved combustion-air and exhaust system. Vent material, diameter, length, fittings and termination are product- and site-specific.
KEY POINTS
What to understand first
Approved system only
Use the vent type and components listed for the exact model.
Length includes fittings
Elbows and termination components affect the permitted layout.
Termination location matters
Openings, grade, snow and nearby property conditions must be reviewed.
Outdoor is a different rating
An outdoor-rated model avoids an indoor vent run but still needs compliant exhaust clearance.
PLAIN-LANGUAGE GUIDE
Venting is part of the appliance system
The vent route manages combustion air and exhaust. A qualified installer must follow the exact model manual for approved materials, equivalent length, jointing, slope, condensate handling where applicable and termination placement.
Do not substitute generic duct, mix systems or copy the route from a different model.
PRACTICAL CHECKLIST
Questions for the gas installer
Use this list to organize the information needed for a model-specific decision.
Which vent system is approved?
Identify the exact manufacturer-approved components.
What is the equivalent length?
Count straight sections, elbows and termination components.
Where will it terminate?
Check openings, grade, walkways, snow and property conditions.
How is combustion air handled?
Follow the exact indoor model design and manual.
Is condensate involved?
Confirm drainage and disposal requirements for the selected model.
Can the route be serviced?
Keep the appliance and vent accessible for inspection.
INDOOR AND OUTDOOR CONTEXT
Use verified product data as the final check
These current NOVIEEX examples carry different installation-location ratings; verify each exact manual before planning exhaust or venting.
INDOOR-RATED EXAMPLE
NOVIEEX Tankless Gas Water Heater – Propane 4.75GPM
- Indoor
- Propane
- Up to 4.75 GPM
OUTDOOR-RATED EXAMPLE
NOVIEEX Tankless Gas Water Heater – Propane 5.3GPM
- Outdoor
- Propane
- Up to 5.3 GPM
COMMON QUESTIONS
Frequently asked questions
Can dryer duct be used for tankless venting?
Do not substitute unapproved material. Use only the vent system permitted by the exact model documentation.
Does an outdoor model need an indoor vent pipe?
An outdoor-rated model does not use an indoor exhaust route, but placement and exhaust clearances still apply.
Are vent distances universal?
No. Maximum length and termination rules vary by model and vent system.
NEXT STEP
Compare Gas Models
Continue with the current NOVIEEX product information and model-specific requirements.