A PVC-vented water heater must be approved by its manufacturer for the specific vent material, pipe size, and installation method; PVC is not interchangeable with every gas-appliance vent system. Among these options, the Wosijm 2-inch termination kit is best for a compatible two-pipe setup, while the DiversiTech 3-inch concentric kit is better for a compatible concentric vent arrangement. The Rheem outdoor tankless model avoids a through-wall vent because it is designed for outdoor installation. The other two products are water heaters, but their supplied details do not establish that they use PVC venting.
| Product | Best suited for | Key detail |
|---|---|---|
| Wosijm SP20285 2-inch kit | Compatible 2-inch PVC or ABS vent pipes | Low-profile termination; 4-inch center-to-center spacing |
| DiversiTech CVENT-3 | Compatible 3-inch concentric vent applications | Combines intake and exhaust in one termination assembly |
| Rheem RTG outdoor tankless | Homes considering an outdoor natural-gas unit | Outdoor installation eliminates the need for vent piping through the home |
| Mini tankless point-of-use heater | Low-flow hot water at one fixture | Electric 120V model; not a PVC-vented gas heater |
| Senville 50-gallon hybrid heat pump | Households comparing electric storage water heaters | Heat-pump model; not a PVC-vented gas heater |
Wosijm SP20285 2-Inch Termination Kit
Best for: A high-efficiency tankless water heater or furnace installation that calls for a compatible 2-inch PVC or ABS termination. This is a vent accessory, not a water heater. It is included because the termination point is an important part of a PVC-vented appliance system.
The product description specifies 2-inch PVC and ABS pipe and a 4-inch center-to-center measurement. Its low-profile design is intended to conceal intake and exhaust piping at the exterior wall. The listing describes horizontal through-wall and vertical through-roof installation options, and says screws are included.
Choose this if the appliance instructions specify a matching pipe size, material, and termination arrangement. Caution: Do not assume this kit fits every 2-inch vented heater. Confirm appliance approval, required clearances, and installation orientation before buying; the product data alone cannot confirm compatibility with a particular heater.
DiversiTech CVENT-3 3-Inch Concentric Kit
Best for: An installation whose appliance manufacturer specifies a 3-inch concentric vent kit. This product is designed for high-efficiency furnaces and is also described as suitable for tankless water heaters. Its dual-pipe arrangement places intake and exhaust functions in one assembly, which can create a tidier exterior than separate exposed pipes.
The listed dimensions are 7.75 by 40 by 6.75 inches, and the finish is white. The product description emphasizes a low-profile appearance and a streamlined installation. Those are useful distinguishing points when comparing it with a termination kit intended for separate 2-inch pipes.
Choose this if the heater instructions call for a 3-inch concentric configuration and identify this type of vent assembly. Caution: The listing does not establish that this kit is appropriate for every PVC-vented water heater. Check the required vent material and model-specific instructions before choosing it.
Rheem RTG Outdoor Natural-Gas Tankless Heater
Best for: Buyers comparing a whole-house outdoor gas tankless heater rather than a PVC-vented indoor unit. The listed model is an outdoor, non-condensing natural-gas heater with an 8.4 GPM rating at a 35°F temperature rise and a 180,000 BTU-per-hour output. The manufacturer description says outdoor installation eliminates venting through the home.
The product information positions it for residential whole-house use and says it can support three to four simultaneous showers under the stated flow and temperature-rise conditions. It also lists a 0.82 Uniform Energy Factor and a metal cabinet designed for wall mounting by a qualified installer.
Choose this if outdoor placement suits the home and you want to compare a unit that does not require an indoor PVC vent run. Caution: This is not a PVC-vented indoor heater. Its stated flow rate depends on temperature rise and demand, and the listing does not establish suitability for every household or climate.
Mini Tankless 3kW Point-of-Use Heater
Best for: Someone who needs low-flow hot water at one point of use, such as an under-sink location, and is comparing alternatives to a gas water heater. This is a 3kW, 120V electric unit, so it does not use a PVC combustion vent. The product description explicitly says it is not intended for showers or multiple taps at once.
It has a digital display and a control knob for on/off operation and temperature adjustment from 30°C to 55°C. Listed safety features include overheat, leakage, dry-heating, and over-pressure protection, as well as IPX4 waterproofing, automatic fault diagnosis, and temperature memory.
Choose this if the need is limited to a single low-flow fixture and the electrical and plumbing requirements fit the installation. Caution: Output temperature depends on inlet water temperature, flow, and heater capacity. It is not a substitute for a whole-house gas heater or a PVC vent kit.
Senville 50-Gallon Hybrid Heat-Pump Heater
Best for: Buyers who want to compare a whole-house electric storage option instead of a gas heater that requires combustion venting. This 50-gallon hybrid water heater extracts heat from the surrounding air, according to its product description. It is not a PVC-vented gas appliance, so it should not be selected as a vent kit or as a direct replacement for a specified gas model.
The listing gives a 3.75 UEF rating and a 69-gallon First Hour Rating. It describes the unit as suitable for medium to large households and lists showers, laundry, and dishes as typical hot-water uses. The claimed energy savings are compared with a standard electric water heater; actual use depends on operating conditions.
Choose this if an electric heat-pump storage design fits the home and household demand. Caution: Capacity and performance are not the same as a tankless heater’s flow rate. Confirm installation space, electrical requirements, and the appliance instructions before choosing it.
Buying Guide: Choosing A PVC-Vented Water Heater
Does the appliance specifically allow PVC venting?
Start with the heater’s installation manual and rating label, not a general assumption that high-efficiency gas appliances use PVC. The appliance manufacturer specifies permitted vent materials, pipe diameter, maximum vent length, fittings, slope, termination type, and clearances. Follow those instructions and local code. A termination kit’s material or size alone does not prove that it is approved for a particular heater.
Also distinguish between a water heater and a vent accessory. The Wosijm and DiversiTech products are termination kits. They do not heat water and should only be considered after identifying an appliance that calls for the matching vent system.
Should you choose a two-pipe or concentric termination?
A two-pipe arrangement typically has separate intake and exhaust paths, while a concentric assembly combines those paths in one termination. The products here illustrate different configurations: the Wosijm kit is specified for 2-inch PVC or ABS pipes and a 4-inch center-to-center spacing; the DiversiTech kit is a 3-inch concentric assembly. These dimensions and descriptions are not interchangeable.
Choose the configuration named in the heater’s instructions. Confirm pipe material, diameter, termination location, and required clearances. If a product description and appliance manual appear to conflict, do not install based on the listing alone; ask a qualified installer or the manufacturer.
Is an outdoor heater an alternative to PVC venting?
An outdoor model can avoid an indoor through-wall vent run when it is specifically designed for outdoor installation. The listed Rheem model is described as an outdoor natural-gas unit. That does not make it a substitute for an indoor PVC-vented heater in every home. Consider the installation location, climate, gas supply, hot-water demand, and manufacturer requirements.
For an indoor unit, do not remove or alter its venting system to imitate an outdoor installation. Venting is essential to the appliance’s operation and safe exhaust handling.
How should you compare capacity and household demand?
Tankless heaters are commonly compared by flow at a stated temperature rise, while storage heaters are compared by tank capacity and first-hour delivery. The Rheem listing gives 8.4 GPM at a 35°F temperature rise; that figure should not be treated as the same measure as the Senville heater’s 50-gallon capacity and 69-gallon First Hour Rating. Consider how many fixtures may run at once and the incoming water temperature.
A small point-of-use electric heater serves a different purpose. The listed 3kW model is described for low-flow use at one point, not for showers or multiple taps. Match the type of heater to the actual demand before comparing individual specifications.
What else should you verify before buying?
- Appliance model: Confirm the exact heater model and the vent components its manual permits.
- Pipe specifications: Match diameter and material, including whether the installation calls for PVC, ABS, or another approved vent material.
- Route and termination: Check permitted vent length, fittings, slope, and required clearances for the planned location.
- Fuel and power: Verify whether the heater is natural gas, electric, or another type and whether the home’s connections meet its requirements.
- Installation: Use a qualified professional when required by the product instructions or local rules. Do not rely on a product listing to replace code or manufacturer guidance.
Frequently Asked Questions
Can any high-efficiency gas water heater use PVC vent pipe?
No. Use PVC only when the specific heater’s manufacturer permits it and specifies the required material, diameter, and installation method. “High efficiency” alone does not confirm PVC compatibility.
What is the difference between a vent kit and a water heater?
A vent kit manages an appliance’s intake or exhaust termination. It does not heat water. A water heater produces hot water and must be paired with the vent arrangement required by its own instructions, if it needs venting.
Are the Wosijm and DiversiTech kits interchangeable?
The listed specifications differ: Wosijm is for 2-inch PVC or ABS pipes, while DiversiTech is a 3-inch concentric kit. They should not be treated as interchangeable. Select only the configuration approved for the appliance.
Does the Rheem outdoor model need a PVC vent through the wall?
The product description says this model is designed for outdoor installation, which eliminates venting through the home. Follow its installation instructions and local requirements; do not assume it can be installed indoors.
Can the mini 3kW heater supply a shower?
The product description says it is for low-flow use and is not suitable for showers or multiple taps at once. Its output also depends on inlet water temperature, flow, and heater capacity.