The right vent kit depends on your heater’s approved venting method, pipe diameter, and installation location. For a 2-inch horizontal PVC or ABS setup, the Wosijm SP20285 and DiversiTech HVENT2 are direct options to compare; the Rheem RTGH-X is for specified Rheem RTGH-3 models installed outdoors. A 3-inch concentric kit is another option when the appliance calls for that size. Verify the water heater manufacturer’s venting instructions before choosing any kit.
| Product | Best suited for | Key detail |
|---|---|---|
| Wosijm SP20285 2-Inch Kit | Buyers checking pipe fit and included screws | 2-inch PVC or ABS; 4-inch center-to-center spacing |
| DiversiTech HVENT2 | Buyers seeking a low-profile 2-inch horizontal termination | Conceals intake and exhaust pipework |
| SP20285 Kit With Screws | Buyers wanting a 2-inch kit listing that specifies included accessories | Horizontal termination with screws |
| Rheem RTGH-X Outdoor Kit | Owners of compatible Rheem RTGH-3 models | For outdoor installation |
| DiversiTech CVENT-3 | Buyers whose appliance calls for a 3-inch concentric vent | 3-inch dual-pipe configuration |
Wosijm SP20285 2-Inch Vent Kit
Best for: Buyers who need a horizontal termination for 2-inch PVC or ABS pipe and want the listed spacing information before purchase. This kit is described for high-efficiency fossil-fuel appliances, including tankless water heaters and furnaces.
Its low-profile design is intended to conceal intake and exhaust pipework at the exterior wall. The product listing gives a 4-inch center-to-center measurement and says the kit can be used for horizontal through-wall or vertical through-roof installations. Confirm that those installation options and the kit itself match your appliance’s approved venting instructions.
- For 2-inch PVC and ABS pipes, according to the listing.
- Designed to cover intake and exhaust pipework.
- Includes screws in the product name.
Limitation: It is not presented as a universal vent termination. Avoid choosing it unless your pipe material, diameter, spacing, and appliance instructions align with its specifications.
DiversiTech HVENT2 Horizontal Kit
Best for: Buyers comparing a named 2-inch horizontal vent kit for a high-efficiency appliance. The listing describes the HVENT2 as a horizontal vent termination for tankless gas water heaters, furnaces, and other high-efficiency fossil-fuel appliances.
The low-profile design is intended to conceal both intake and exhaust pipework, giving the outside wall a tidier appearance than exposed pipe ends. Listed dimensions are 9.65 by 2.9 by 13.45 inches. Use those measurements to assess available space, but check the actual installation drawing and appliance requirements before cutting or routing vent piping.
- Horizontal termination kit.
- Designed for high-efficiency fossil-fuel appliances.
- Conceals intake and exhaust pipework.
Limitation: The supplied product details do not specify every permitted pipe material or installation clearance. Verify both against the manufacturer’s documentation rather than assuming compatibility from the 2-inch designation alone.
SP20285 Horizontal Kit With Screws
Best for: Buyers looking for a 2-inch SP20285-style horizontal termination kit whose listing explicitly says screws are included. It is described for tankless gas water heaters, high-efficiency furnaces, and other high-efficiency fossil-fuel appliances.
The kit is presented as a way to conceal intake and exhaust piping at the termination. The listing says the horizontal vent termination and screws are included, which may help buyers identify the basic items supplied. Compare its exact requirements with the appliance manual and the dimensions of the existing vent layout before ordering.
- Described as a horizontal vent termination kit.
- Listing specifies included screws.
- Intended for high-efficiency fossil-fuel appliances.
Limitation: The supplied features do not state the compatible pipe material, center spacing, or detailed dimensions. Do not infer those specifications from another SP20285 listing; verify the exact product details before purchase.
Rheem RTGH-X Outdoor Vent Kit
Best for: Owners of Rheem high-efficiency tankless water heaters in the RTGH-3 model range who are planning an outdoor installation. This product is a model-specific outdoor vent kit, rather than a general 2-inch horizontal PVC termination.
The listed benefits are that outdoor installation can save indoor space and venting costs, and that assembly uses a Phillips-head screwdriver. Its stated compatibility is limited to Rheem high-efficiency tankless water heaters identified as RTGH-3 models. Check the exact model number and installation instructions before selecting it.
- For compatible Rheem RTGH-3 models, according to the listing.
- Designed for outdoor installations.
- Listed as assemblable with a Phillips-head screwdriver.
Limitation: It is not a universal alternative to PVC vent kits. Avoid it if your heater is not a listed compatible model or if the installation plan requires a different approved venting arrangement.
DiversiTech CVENT-3 Concentric Kit
Best for: Buyers whose appliance documentation calls for a 3-inch concentric vent arrangement. The listing describes a dual-pipe configuration for high-efficiency furnaces and also names tankless water heaters among the applications for proper venting.
This kit is a distinct size and configuration from the 2-inch horizontal termination options above. Its low-profile design is intended to conceal intake and exhaust pipework. Listed dimensions are 7.75 by 40 by 6.75 inches, and the product is described as white. Check the required pipe diameter and vent design before comparing it with a different kit.
- 3-inch concentric vent kit.
- Dual-pipe configuration.
- Low-profile design that conceals intake and exhaust pipework.
Limitation: Do not select it just because a 3-inch kit seems larger or more versatile. It is appropriate only when the appliance’s instructions specify an approved configuration that matches this product.
Buying Guide: Choosing a PVC Vent Kit
Which pipe diameter and material does the heater require?
Start with the water heater’s installation manual and model-specific venting instructions. Confirm the required diameter and approved material before comparing kits. The Wosijm SP20285 listing specifies 2-inch PVC and ABS pipe. The DiversiTech CVENT-3 is identified as a 3-inch concentric kit. Those are different products for different vent layouts, not interchangeable sizes.
Do not rely on a generic description such as “high-efficiency” to establish compatibility. Appliance requirements can vary by model and installation type. If a kit listing leaves out pipe material, spacing, or other details, check the manufacturer’s documentation or ask a qualified installer to confirm the match.
Do you need a horizontal, concentric, or outdoor arrangement?
A horizontal termination is generally considered when venting passes through an exterior wall, subject to the heater’s approved instructions and required clearances. The SP20285 and HVENT2 listings describe horizontal kits. A concentric kit combines intake and exhaust into a dual-pipe configuration; the CVENT-3 is the listed 3-inch option here.
An outdoor kit is a different choice. The Rheem RTGH-X is specified for compatible RTGH-3 models and outdoor installations. It should not be treated as a generic substitute for a PVC wall termination. Match the proposed configuration to the exact heater model and installation location.
How important are dimensions and pipe spacing?
Dimensions affect whether a termination fits the planned location and whether its pipe connections align with the existing layout. The Wosijm SP20285 listing gives 4-inch center-to-center spacing. The HVENT2 and CVENT-3 listings provide overall dimensions. Compare those figures with the product’s installation details and the space available on the wall or roof.
Check whether a stated measurement refers to overall size, pipe spacing, or another feature. Similar-sounding kits can have different dimensions or included parts. Do not assume that a measurement from one SP20285 listing applies to another listing.
What should you check before installation?
- Confirm the exact heater model and its approved vent system.
- Match the kit’s pipe diameter and material to the appliance instructions.
- Check whether the proposed route is horizontal, vertical, concentric, or outdoor.
- Review termination location, clearances, and installation steps in the heater manual.
- Verify what components are included and whether the listing provides the needed specifications.
- Use a qualified professional when required by local rules or when venting details are unclear.
Venting is a safety-critical part of a gas appliance installation. A product description alone does not establish that a particular layout meets the heater’s requirements or local codes. Follow the appliance manufacturer’s instructions and applicable local requirements.
How do the listed options compare?
For a 2-inch PVC or ABS application with stated center spacing, the Wosijm SP20285 listing provides the most specific pipe-fit details among these options. The DiversiTech HVENT2 is described as a low-profile horizontal kit, but the supplied details do not specify all pipe materials. The second SP20285 listing explicitly mentions included screws but does not give the same pipe-fit information.
Choose the Rheem RTGH-X only for a compatible RTGH-3 outdoor installation. Consider the CVENT-3 only when a 3-inch concentric vent matches the appliance instructions. Product category, brand, or appearance cannot replace model-specific compatibility checks.
Frequently Asked Questions
Can I use any PVC vent kit with a high-efficiency gas water heater?
No. The heater manual determines the approved vent type, diameter, material, layout, and installation requirements. Confirm those details before buying a kit.
Is a 2-inch kit interchangeable with a 3-inch kit?
No. The listed 2-inch and 3-inch kits have different diameters and configurations. Use the size and vent arrangement specified for the exact appliance model.
What is a concentric vent kit?
A concentric kit uses a dual-pipe configuration for intake and exhaust. The DiversiTech CVENT-3 is listed as a 3-inch concentric kit. Confirm that the heater allows this configuration.
Does the Wosijm SP20285 fit both PVC and ABS?
One Wosijm SP20285 listing says it is suitable for 2-inch PVC and ABS pipes and gives 4-inch center-to-center spacing. Verify that the exact listing and appliance instructions match your installation.
Can the Rheem RTGH-X kit be used with any tankless water heater?
The supplied listing identifies compatibility with Rheem high-efficiency tankless water heaters in the RTGH-3 model range. Check the exact model before choosing it.
Should I install a gas water heater vent myself?
Follow the water heater manufacturer’s instructions and applicable local requirements. If the vent route, clearances, or product compatibility are unclear, consult a qualified installer.