Tankless Water Heater Venting Kits

To get the maximum advantages of tankless models, the right venting termination kit for tankless water heaters is must. 

The great thing is that a number of models come with the vent when you buy through Amazon. But there are certain scenarios when you need a separate venting kit with extended length. It usually depends on the area where the tankless heater is installed. 

Tankless Water Heater Venting Kits

I have gathered the accurate information about vent termination kits of different renowned tankless brands to finish the venting efficiently. 

Rinnai 12 Inch Condensing Horizontal Termination Kit

  • A double-layered pipe
  • A sloped hood drains the condensation
  • All joints are sealed
  • Easily fits other brands

Rheem Horizontal Vent Termination Kit

  • It has two ports: intake and exhaust
  • Installs easily
  • Compatible with other brands
  • 3 inch horizontal termination kit

Z-Flex Z-Vent Horizontal Kit

  • Stainless steel category of ll/lll
  • Slanted hood
  • Certified non-corrosive by UL
  • Other brands compatible

Rheem 3/ 5 Vertical Vent Termination Kit

  • Appliance adapter with integrated condensation collector
  • Condensate drain tube
  • Vertical termination with rain cap
  • .50-1 pitched cone flashing

Rinnai 18-Inch Above Roof Termination

  • Vertical termination through roof
  • Metal outer vent for intake
  • Aluminium inner vent for exhaust
  • GSA approved
  • Professional installation recommended

Venting Tankless Water Heater Through Chimney

Generally using a chimney for venting tankless water heaters is not a smart decision. The reason is that the condensation process is acidic and dangerous and may corrode the masonry chimney easily. 

Venting Tankless Water Heater Through Chimney

Sometimes it becomes inevitable to go for venting tankless water heaters through chimneys in certain situations. There are ways to make it compatible such as using stainless steel. But there are other factors to affect this in a hazardous way. 

Following are the reasonable ways that suggest to avoid the venting through the chimney.

  •  Sharing of furnace or other water heaters venting is not possible in this way. The tankless heater goes well with its own ventilation. 
  • You must have PVC or category lll stainless steel vent. Otherwise, corrosion will shorten the lifespan of tankless and need expensive replacement for chimneys. This does not top here, it may result in leaking carbon monoxide into your home. 
  • It requires a sloped vent to avoid the condensate dripping back towards the heat exchanger. To drain the condensate properly, even a liner is not helpful in this situation. Many tankless models are available with proper drainage equipment. 
  • A short vent is very useful. But if you vent through the chimney, a lengthy vent is required for exhaust. This increases the danger of entering carbon monoxide into your home. 

Choosing the right place to install a gas tankless water heater is crucial. The shorter the length the higher the efficiency. I have researched thoroughly and analyzed different venting options and wrote this article. So read out before making your decision. 

Daniel Adley is a seasoned and skilled plumber with over 20 years of experience. Specializing in repairing and optimizing water appliances for large buildings, offices, and homes, he has a keen eye for efficiently identifying plumbing and maintenance issues. With a passion for his craft, Daniel brings extensive knowledge and expertise to every project, ensuring reliable and effective solutions for his clients.

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