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Tankless Water Heater Venting
Installation Tips

Either you lot accept purchased a tankless water heater or searching for relevant information about on-demand heating units, installation requirements for the venting system are something you should carefully explore. The proper selection of the heater type can assistance you reduce utility expenses, lower energy consumption, and save you fourth dimension on installation.

Earlier you determine on buying an on-demand heater, consider the following guide, tips, and venting requirements.

Venting options in tankless h2o heaters

• Indoor or outdoor
• Power vent or direct vent
• Horizontal or vertical termination
• Ii-pipe or one-pipe venting
• Stainless steel or PVC venting

Exercise I need venting for my water heater?

Every gas-powered tankless water heater that is installed within the firm requires a venting system, while an electric type does not. Vents are designed to remove exhaust gases outside safely.

This includes traditional tank-type gas heaters also.

Every gas-powered unit of measurement is burning natural gas or propane to produce estrus. This is happening inside the combustion bedchamber by utilizing the gas burner. Every bit the unit releases energy to heat water, it as well generates exhaust gases.

Released exhaust gases, such as carbon monoxide and NOx, are not prophylactic for people; actually, they are dangerous and must be removed into the outside atmosphere where they dissipate.

Tip: Purchase carbon monoxides detectors to keep your family safe. Install a detector on every level and in every bedroom.

To remove the gases safely, tankless h2o heaters normally use one of the following venting types: power or directly vent. This applies to tankless models designed for indoor installation, while the outdoor models do not require a venting organization because they are already installed outside.

What do you lot need to know about tankless venting

Power vent vs. direct vent

Gas tankless water heaters tin can use indoor or outdoor air for combustion, and the frazzle gases must freely travel to the outside temper, with no obstructions and leaks.

Equally mentioned before, there are two types of venting systems used on tankless water heaters: power-vent and direct-vent.

Power-vent water heaters use indoor air for gas combustion, while direct-vent utilize outside air.

A power-vent model comprises an exhaust fan and only i pipage, which is exhaust, while a direct-vent model has two, one for air intake and the other for exhaust.

While both tankless water heaters require sufficient air for gas combustion, power-vented models must be placed in a large room or room connected to another with louvers or have open doors, or the walls accept provisions that will ever bring the fresh air in.

If the water heater is installed in a confined infinite (if space volume is less than fifty ft. per m BTU/60 minutes), that space must have two air openings with the specified sizes and distances from the floor and ceiling.

In a direct-vent setup where the tankless utilizes ii pipes, you can either install two separate pipes (two-pipe system) or a 1-pipe system with the concentric (coaxial) setup, besides known as a pipe within the pipe.

The coaxial type consists of an insulated intake pipe with five and 4 inches in diameter and exhaust pipes with 2 and three inches, which enable the vent to remain cold to the touch, therefore, preventing the risk of burn down injuries.

According to some experts, such systems are easier to install; they require less infinite and are safer to use. Even if at that place is a leak in an frazzle pipe, the toxic gas is contained within the concentric vent and then it does not pollute the air and affect your health.

Indoor or outdoor

Tankless-indoor

Indoor tankless water heaters must release exhaust gases to the exterior temper using one of the vent types mentioned in a higher place: ability or direct vent. They cannot be installed exterior unless they use a dedicated kit (where applicable).

Outdoor models have vent slots on the front panel and do not require boosted vents.

Tankless-outdoor

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Typical installation and how to configure vents

Tankless-indoor concentric

Tankless-indoor 2 pipe

The about typical sizes of tankless vents are iii" and 4". The vents are connected to a vent adapter that comes with the unit.

The typical vent installation of the tankless indoor water heater is horizontally through the sidewall or vertically through the roof. When yous compare to the standard vent installation of the tank-type water heaters, tankless brings more flexibility and is cheaper, peculiarly with the sidewall installation when remodeling the house.

If y'all decide to go with the horizontal installation of your not-condensing unit, you would have to gradient the vent down and away from the heater. The vent will get out the tankless unit vertically, so turn using a ninety-degree elbow and then direct, pointing downward (1/4" per foot) and outside. At the end of the exhaust, there will be another 90-caste elbow. This is the simplest setup.

The vertical installation has an upward slope, and information technology is equipped with the condensation trap, a rain cap at the cease, or an elbow.

These two methods are used to protect the water heater from amercement caused by acidic condensate.

If y'all have a condensing tankless water heater, slope the venting ¼" per human foot and toward the heater. The condensate should not drain through a heater simply the trap.

Likewise, information technology is recommended to install vent screens to foreclose foreign objects from inbound the last.

If you alive in a region with a warmer climate, outdoor models are a not bad option because no venting is required, and they free up indoor space for other use. Such types are often installed on the outside wall of the house and inside the recess box, protecting it from the cold conditions and elements.

You lot are even safe if you lot alive in a region with below-freezing temperatures because tankless are ofttimes equipped with a system that automatically provides heating.

Non-condensing models must use "Category 3" or "Category 4" stainless steel vents (PVC is non suggested) due to the college exhaust temperature. In contrast, condensing heaters can be vented with PVC and PP pipes, which are cheaper and easier to install (and handle).

Note: Every manufacturer specifies the maximum lengths that you tin run the venting. The number of elbows is limited considering they shorten the full vent distance.

If one tankless heater does non produce enough hot water for your abode, you lot tin can combine more than two units into i system. As they can use a manifold to share the same vents, individual vent penetration is not needed, saving you fourth dimension and coin during installation. Plus, it is more practical and aesthetically nicer to have fewer wall openings.

Tankless-common venting

Useful tips

• Avoid dips and sags in horizontal venting by installing recommended supports (pipe hangers).
• Venting should exist installed equally direct as possible and with a minimum number of pipe bends.
• Venting connections should form an airtight seal to foreclose gas leaks.
• Connecting the venting system to an existing chimney is non recommended.
• Avoid vent termination nearly other vents and exhaust.
• Follow the manufacturer'south instructions regarding the distances to other objects (windows, doors, ground, walkways, and such).
• Combustion air must be free of corrosive chemicals.
• Check the vent system at least once annually for leaks, blockages, and damages.
• White smoke coming out from the exhaust vent is normal.
• Avoid using longer than recommended vents and an oversized vent pipe.
• Vents terminating at the roof should have a rain cap or other blazon (90+45 bends).

Warning: Improper venting of whatsoever gas h2o heater can lead to carbon monoxide leaks and poisoning.

Manufacturers of vent components

• Centrotherm
• Metal Fab
• Ubbink
• Heat-Fab
• IPEX

Decision

There are three the most used venting systems in residential water heating: atmospheric, direct-vent, and ability-vent. They apply flue ducts or a chimney to move the frazzle gases from the h2o heater to the outdoors. Depending on the venting system, flue ducts tin be metallic or plastic.

Related

• Tankless installation
• Venting tips
• Condensation
• Troubleshooting

1. Dwelling
2. Tankless water heaters
3. Tankless Water Heater Venting

Source: https://www.home-water-heater.com/tankless-venting.html

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