A Rheem tankless water heater delivers continuous hot water on demand — but the installation is only as reliable as the accessories supporting it. From the venting system that safely exhausts combustion gases to the controls accessories that keep the unit connected and protected, every component in the installation matters. This guide covers every Rheem tankless accessory category so you have everything you need before you start the job.
PlumbersCrib.com is an authorized Rheem dealer. Browse the full Rheem tankless lineup at PlumbersCrib.com or contact our team with any questions about accessories for your specific installation.
The Rheem tankless accessory lineup covers three core areas of every installation — venting, controls, and installation and service components. All Rheem accessories are OEM Genuine Factory Authorized Parts, engineered for exact fit and function with Rheem tankless water heaters.
1. ProTech venting — non-condensing installations
Rheem's ProTech venting system is the OEM venting solution for all Rheem Tankless Gas Non-Condensing indoor installations. The transition to ProTech venting streamlines the product lineup and provides a consistent, high-quality venting solution across all non-condensing units.
ProTech venting is built with durable stainless steel construction rated for the high-temperature exhaust of non-condensing units — 300°F to 500°F. The updated 90-degree elbow design improves ease of installation and simplifies future maintenance access. Because ProTech venting is OEM factory authorized, it is engineered for exact fit and function with Rheem non-condensing tankless water heaters — no adapters, no compatibility guesswork.
Non-condensing venting reminder: Never use PVC on a non-condensing tankless unit. Exhaust temperatures of 300°F–500°F will cause PVC to fail — a fire and carbon monoxide hazard. ProTech stainless steel venting is the correct material for all Rheem RTG Series non-condensing installations. See our complete tankless venting guide for full material and clearance requirements.
ProTech venting key features:
- Durable stainless steel construction rated for non-condensing exhaust temperatures
- Updated 90-degree elbow for easier installation and maintenance access
- OEM Genuine Factory Authorized Parts — exact fit for Rheem non-condensing tankless units
- Consistent solution across the full Rheem non-condensing lineup
2. Controls accessories
Rheem's controls accessories enhance control, safety, and connectivity for your tankless installation. The lineup includes leak sensor kits, control displays, cables, and more — all engineered for seamless integration with Rheem tankless units.
Leak sensor kits. Rheem IKONIC indoor Wi-Fi models include LeakGuard built in — but on units without built-in leak detection, a leak sensor kit adds that layer of protection. The sensor detects water at the base of the unit and triggers an alert before a small drip becomes a significant water damage event. On commercial installations or any installation where the unit is in a finished space, a leak sensor is worth adding at rough-in.
Control displays. Remote display accessories allow the unit's temperature and status to be monitored from a location other than the unit itself — useful when the generator is installed in a basement, mechanical room, or exterior location and the primary interaction point needs to be elsewhere in the building.
Cables and connectivity. Rheem offers OEM cables for extending control connections and integrating EcoNet Wi-Fi functionality. Using OEM factory authorized cables ensures reliable signal and proper function — third-party cables can introduce compatibility issues on digital control systems.
- Engineered for seamless integration with Rheem tankless units
- Enhanced controls and reliability versus aftermarket alternatives
- OEM Genuine Factory Authorized Parts — exact fit and function for Rheem tankless water heaters
3. Installation and service parts
Rheem's installation and service parts cover everything needed for a complete, reliable tankless setup — from the rough-in components that make the installation clean and code-compliant to the service parts that keep the unit running at peak performance for years.
Recess boxes. A recessed mounting box allows the tankless unit to sit flush with the wall surface rather than protruding — a meaningful aesthetic improvement in finished spaces like laundry rooms, kitchens, and mechanical closets. Rheem OEM recess boxes are sized and engineered for exact fit with specific Rheem models.
Pipe covers. Pipe cover kits dress the water and gas connections at the base of the unit for a clean, finished appearance. Essential on any installation in a visible location — laundry rooms, kitchens, utility areas — where exposed copper or flexible connectors would look unfinished.
Pressure relief valves. The temperature and pressure relief valve is a required safety component on tankless water heater installations in most jurisdictions. Using a Rheem OEM pressure relief valve ensures the component is rated and matched to the unit's operating pressure and temperature range. Confirm local code requirements for PRV installation before finalizing the rough-in.
Essential installation components. The Rheem installation accessories lineup also includes service isolation valves, condensate neutralizers for IKONIC condensing units, outdoor conversion kits, and other components that complete the installation. Planning these at rough-in avoids costly callbacks and retrofit work after drywall is closed.
- Supports long-term performance — OEM parts maintain warranty compliance
- Simplified installation and maintenance — engineered for exact fit
- OEM Genuine Factory Authorized Parts — exact fit and function for Rheem tankless water heaters
Why OEM parts matter. Third-party accessories may appear compatible but can introduce fit issues, reduce reliability, and — in some cases — affect warranty coverage. Rheem OEM Genuine Factory Authorized Parts are the only accessories engineered and tested for exact fit and function with Rheem tankless units. When the job needs to be done right the first time, OEM is the correct specification.
Rheem accessories checklist by installation type
| Accessory | IKONIC condensing | RTG non-condensing | Commercial IKONIC |
|---|---|---|---|
| ProTech stainless steel venting | ✗ — uses PVC/CPVC | ✓ Required | ✗ — uses PVC/PP |
| Condensate neutralizer | ✓ Required | ✗ — not applicable | ✓ Required |
| Leak sensor kit | Built in on Wi-Fi models | Recommended | Built in via LeakGuard |
| Outdoor conversion kit | Available for outdoor models | Available for outdoor models | Available |
| Pressure relief valve | Confirm local code | Confirm local code | Confirm local code |
| Recess box | Optional — finished spaces | Optional — finished spaces | Not applicable |
| Pipe cover kit | Optional — visible locations | Optional — visible locations | Not applicable |
Frequently asked questions
Can I use third-party venting on a Rheem tankless unit?
For non-condensing units, Rheem recommends ProTech OEM venting for exact fit and compatibility. If using a third-party Category III stainless steel vent system, confirm it is rated for the unit's exhaust temperature and that the diameter and fittings are compatible with Rheem's specified vent connections. Always check the installation manual for approved venting specifications before substituting.
Do I need a condensate neutralizer on a Rheem IKONIC?
Yes — the Rheem IKONIC is a condensing unit that produces acidic condensate. Most jurisdictions require a condensate neutralizer before the condensate enters a drain connected to a municipal sewer system. Inspect the neutralizer at every annual maintenance visit and replace the cartridge when the media is depleted or flow becomes restricted.
Does the Rheem RTG Series need a condensate neutralizer?
No — the RTG Series is non-condensing and does not produce condensate. A condensate neutralizer is only required on condensing units like the Rheem IKONIC Series and Rheem IKONIC Commercial.
What is included in a Rheem outdoor conversion kit?
Rheem outdoor conversion kits include the components needed to adapt an indoor-rated unit for outdoor installation — typically a weatherproof cover or housing that protects the unit's electrical components and controls from rain, debris, and UV exposure. Confirm the specific kit for your model number before ordering.
Where can I order Rheem OEM accessories?
Rheem OEM parts and accessories are available through authorized Rheem dealers. Contact our team at PlumbersCrib.com for help identifying the correct accessory part numbers for your specific Rheem unit and installation.
Shop Rheem tankless at PlumbersCrib.com
- Rheem IKONIC Series — 0.96 UEF condensing, dual stainless steel heat exchangers, 8.4 to 11.2 GPM
- Rheem RTG Series — 0.82 UEF non-condensing, copper heat exchanger, 7.0 to 9.5 GPM
- Rheem IKONIC Commercial — 199,900 BTU per unit, rack systems from 2 to 32 units
Contact our team or call 877-881-5501 Monday through Friday for help identifying the right accessories for your Rheem installation.