This guide offers a high-level overview, addressing key questions, but doesn’t replace the Use & Care Manual. Always follow all instructions and local codes diligently.
Rheem tankless water heaters represent a significant advancement in home comfort, offering on-demand hot water and eliminating the standby heat loss associated with traditional tank-style heaters. This installation guide is designed to assist qualified installers in the proper setup and configuration of Rheem tankless units.
Understanding the purpose of this manual is crucial; it provides basic directions and recommendations for correct installation and adjustment. For the owner, it explains features, operation, safety, maintenance, and troubleshooting. A parts list is also included. Proper venting is paramount – failure to adhere to venting guidelines can lead to dangerous consequences, including fire, explosion, or carbon monoxide poisoning.
Safety Precautions
DANGER: Improper installation and venting of your Rheem tankless water heater can result in severe hazards, including death from fire, explosion, or carbon monoxide poisoning. NEVER operate the unit without proper venting and adequate air supply. Ensure the installer is qualified and understands all safety protocols.
Before beginning, verify the unit has its original serial numbers and rating labels intact. Do not install a unit that has been tampered with or lacks these identifiers. Installation must be performed by someone authorized to act on the owner’s behalf. Always disconnect gas and electrical supplies before servicing. Prioritize safety throughout the entire process.
Tools and Materials Required
For a successful Rheem tankless water heater installation, gather essential tools including pipe wrenches, adjustable wrenches, a gas pipe sealant, a level, and appropriate venting components. Materials needed encompass gas piping (minimum 3/4″ as code dictates), copper or PEX water lines, fittings, Teflon tape, and electrical wiring suitable for the unit’s specifications.
A carbon monoxide detector is crucial for safety. Depending on the venting configuration (direct vent or two-pipe), specific vent pipe materials will be required. Ensure you have a remote control for operation and testing equipment to verify gas line integrity and water temperature settings post-installation.
Pre-Installation Checklist
Before commencing installation, verify you are the owner or have explicit consent to act on the owner’s behalf. Confirm the unit retains its original serial numbers and rating labels – do not proceed if missing. A thorough assessment of gas, water, and venting systems is vital; Ensure the gas supply meets the unit’s BTU requirements, and water lines are appropriately sized for flow.
Inspect the intended mounting location for adequate space and structural support. Review local codes and regulations to guarantee compliance. This preparatory step ensures a safe and efficient installation process, avoiding potential issues later.
Gas Supply Requirements
The Rheem tankless unit necessitates a gas supply capable of meeting its BTU input, typically utilizing natural gas or propane. A minimum gas pipe size of ¾ inch is generally recommended for single unit installations, but local codes always take precedence. Proper gas pipe sizing is crucial to maintain adequate pressure and flow to the heater, ensuring optimal performance.
Verify the gas supply line is free from leaks before connecting to the unit. A qualified professional should perform this check. The gas shut-off valve must be readily accessible for future maintenance or emergencies. Adherence to these requirements guarantees safe and efficient operation.
Water Supply Requirements
Rheem tankless water heaters require a cold water supply line to operate effectively. A minimum of ¾ inch diameter piping is generally recommended for both inlet and outlet connections, though local plumbing codes may dictate different specifications. Ensure the water supply line is free of debris and sediment to prevent damage to the unit’s flow sensors and heat exchanger.
Consider installing a water filter upstream of the tankless heater to further protect it from impurities. Proper water pressure is also vital; check the manufacturer’s specifications for the recommended range. Adequate water flow is essential for the unit to activate and deliver hot water on demand.
Venting Requirements
DANGER: Improper venting can lead to fatal carbon monoxide poisoning, fire, or explosion. Rheem tankless water heaters must be vented directly to the outdoors according to the manufacturer’s instructions and local codes. Failure to do so is extremely dangerous. The venting system must be designed to handle the exhaust gases produced during operation.
Materials used for venting must be approved for high-temperature exhaust. Options include stainless steel or specialized PVC/CPVC venting pipes. Proper slope and termination are crucial to ensure adequate draft and prevent backdrafting. Always consult the installation manual for specific venting configuration requirements.
Unit Mounting and Placement
Careful consideration should be given to the location of the Rheem tankless water heater. Ensure the chosen spot allows for adequate access for future maintenance and servicing. The unit must be mounted securely to a wall, following the manufacturer’s specifications regarding clearances from combustible materials.
Verify the wall can support the unit’s weight, especially when filled with water. Proximity to gas and water supply lines will minimize piping runs. Consider the venting pathway; a direct vent configuration requires a wall penetration. Ensure sufficient air intake is available for proper combustion, as outlined in the installation manual.
Gas Line Connection
Connecting the gas line requires strict adherence to safety protocols and local codes. A minimum gas line size of ¾ inch pipe is generally recommended for single tankless units, but always verify based on BTU input and run length. Use only approved gas pipe materials and fittings, applying pipe joint compound suitable for gas lines.
Before connecting, ensure the gas supply is shut off. After connection, perform a thorough leak test using a soap and water solution on all joints. Never use an open flame for leak detection. Proper gas pressure is crucial for optimal performance; consult the unit’s specifications for the correct pressure range.
Gas Pipe Sizing
Accurate gas pipe sizing is paramount for safe and efficient operation. The required pipe diameter depends on the Rheem tankless unit’s BTU input, the length of the gas line run, and the allowable gas pressure drop. Longer runs necessitate larger diameter pipes to maintain adequate gas flow.
Typically, a ¾-inch pipe is a minimum for many models, but calculations based on the specific unit and installation conditions are essential. Consult the manufacturer’s installation manual for detailed sizing charts and instructions. Undersized gas lines can lead to insufficient heating and potential safety hazards, while oversized lines are unnecessary and costly.
Leak Testing
Following gas line connection, rigorous leak testing is absolutely critical for safety. Apply a leak detection solution – a mixture of soapy water works effectively – to all gas connections, including fittings, unions, and the gas valve itself. Carefully inspect for bubbles, which indicate a leak.
Never use an open flame to check for leaks! If any leaks are detected, immediately shut off the gas supply, tighten the connections, and retest. Repeat this process until no leaks are present. Proper leak testing prevents dangerous gas buildup and potential fire or explosion hazards. Document the leak test results for your records.
Water Line Connection
Connect cold water supply to the tankless unit’s inlet, ensuring a minimum pipe size of ¾ inch, or as dictated by local plumbing codes. Use dielectric unions to prevent galvanic corrosion between dissimilar metals – crucial for longevity. Proper grounding is also essential during this phase.
Flush the water lines thoroughly before connecting to the unit to remove any debris or sediment. This prevents damage to the flow sensor and heat exchanger. Securely tighten all connections to avoid leaks, and inspect for proper sealing after initial water flow is established. Consider installing a shut-off valve for easy maintenance.
Venting System Installation
DANGER: Improper venting can lead to fatal carbon monoxide poisoning, fire, or explosion. Always adhere strictly to the manufacturer’s instructions and local codes regarding venting. Determine if a direct vent or two-pipe system is required based on the unit and installation environment.
Utilize approved vent pipe materials – typically stainless steel or PVC – ensuring proper diameter and slope for efficient exhaust. Seal all joints securely with appropriate venting cement or clamps. Maintain required clearances to combustible materials. Inspect the entire venting system for obstructions or leaks before initial startup, and verify proper draft.
Vent Pipe Materials
Rheem tankless water heaters typically require either stainless steel or PVC vent pipe, depending on the specific model and local codes. Stainless steel is often preferred for its durability and resistance to corrosion, particularly in harsh environments. PVC must be Schedule 40, specifically designed for venting appliances, and marked accordingly.
Ensure the chosen material is compatible with the water heater’s exhaust temperature. Always use approved fittings and sealant designed for the selected vent pipe material. Avoid mixing different materials within the venting system. Proper material selection is crucial for safe and efficient operation, preventing potential hazards like leaks or corrosion.
Venting Configuration (Direct Vent vs. Two-Pipe)
Rheem tankless water heaters can utilize either a direct vent or two-pipe (separated intake and exhaust) venting configuration; Direct vent systems draw combustion air directly from the outside and exhaust flue gases to the exterior through a single vent pipe. Two-pipe systems, conversely, use separate pipes for air intake and exhaust, offering greater flexibility in installation locations.
The choice depends on the installation environment and local codes. Direct vent is simpler, while two-pipe allows for longer vent runs. Proper sizing and sealing of all vent connections are critical, regardless of the chosen configuration, to prevent carbon monoxide buildup and ensure safe operation.
Electrical Connection
Rheem tankless water heaters require a dedicated electrical circuit for operation. Before connecting, ensure the power supply matches the unit’s voltage requirements, typically 120V or 240V, as specified on the unit’s data plate. A grounded connection is essential for safety. Use appropriately sized wiring, adhering to local electrical codes, to prevent overheating and potential fire hazards.
The electrical connection is typically made through a junction box located on the unit. Always disconnect power at the breaker before making any electrical connections. Improper wiring can damage the unit and void the warranty, so professional installation is highly recommended.
Initial Startup and Testing
After completing all connections – gas, water, and electrical – it’s time for initial startup. Before turning on the gas supply, carefully check all connections for leaks using a soap and water solution. Once confirmed leak-free, slowly open the gas valve according to the manufacturer’s instructions.
Turn on the water supply and bleed the air from the lines by opening a hot water faucet. Power on the unit and follow the startup sequence outlined in the Use & Care Manual. Verify proper operation by checking for consistent hot water delivery and monitoring the unit for any error codes or unusual noises.
Remote Control Installation and Setup
The remote control allows convenient temperature adjustment and monitoring of your Rheem tankless water heater. Mount the control unit in a readily accessible location, avoiding direct sunlight or moisture. Connect the remote control to the main unit using the provided wiring, ensuring secure connections as per the installation manual.
Power up the water heater and the remote control. Follow the pairing instructions in the manual to synchronize the devices. Once paired, test the remote’s functionality by adjusting the temperature and verifying the changes are reflected on the unit’s display. Familiarize yourself with all remote control features for optimal operation.
Water Temperature Adjustment
Adjusting the water temperature is crucial for comfort and safety. Utilize the remote control or the unit’s control panel to set your desired temperature. Rheem tankless heaters typically offer a wide temperature range, allowing for personalized settings. Start with a moderate temperature, around 120°F (49°C), to prevent scalding.
Gradually increase or decrease the temperature as needed, monitoring for comfortable hot water delivery. Be mindful of household members, especially children and the elderly, who may be more sensitive to higher temperatures. Regularly check the temperature setting to ensure it remains consistent and safe for all users.
Troubleshooting Common Issues
Several issues can arise during operation. No hot water often indicates a gas supply problem, a tripped circuit breaker, or a flow sensor malfunction. Low water temperature may stem from insufficient gas pressure or incorrect temperature settings. Unusual noises could signal air in the lines or a component failure.
Error codes displayed on the unit’s control panel provide valuable diagnostic information; consult the Use & Care Manual for specific code meanings. Before attempting repairs, ensure the unit is powered off. If problems persist, contact a qualified Rheem technician for assistance – do not attempt complex repairs yourself.
Maintenance and Care
Regular maintenance ensures optimal performance and extends the lifespan of your Rheem tankless water heater. Periodically flush the unit to remove mineral buildup, especially in areas with hard water – follow the manufacturer’s instructions carefully. Inspect the air intake and exhaust vents for obstructions, ensuring proper ventilation.
Check gas and water connections for leaks annually. Clean the exterior with a damp cloth; avoid harsh chemicals. The remote control should also be inspected for proper function. Following these simple steps will help maintain efficiency and prevent potential issues, keeping your hot water flowing reliably for years to come.
Warranty Information
Rheem tankless water heaters are backed by a comprehensive warranty, protecting against defects in materials and workmanship. The specific warranty duration varies depending on the model – typically covering the heat exchanger for a longer period. Registration of your unit is crucial to activate the full warranty benefits; ensure timely registration after installation.
The warranty does not cover issues arising from improper installation, lack of maintenance, or damage due to freezing. Keep your proof of purchase and this installation guide for warranty claims. Refer to the official Rheem warranty documentation for complete details, terms, and conditions, available on their website or within the product manual.
Local Codes and Regulations
Adherence to local plumbing, gas, and electrical codes is paramount during Rheem tankless water heater installation. These regulations vary significantly by location and are designed to ensure safety and proper functionality. Before commencing any work, contact your local building department to ascertain the specific requirements in your area.
Permits may be required for both the plumbing and gas line connections. Venting configurations must also comply with local codes to prevent carbon monoxide hazards. Failure to meet these standards can result in fines, failed inspections, and voided warranties. Always prioritize safety and compliance with all applicable regulations throughout the installation process.
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