Heat Pump Water Heater Installation: Complete Rheem Guide

Getting your Rheem heat pump installation done right is essential for long-term efficiency, safety, and performance. Whether you’re a homeowner tackling the job yourself or considering a professional, this heat pump water heater installation guide walks you through everything you need to know. From prep and requirements to the full heat pump water heater installation process, we’ll help you set up your system for success. Please note, it is always recommended to consult a certified professional with expertise in heat pump water heaters. 

What Are the Installation Requirements for Heat Pump Water Heaters? 

Space Requirements

• Air Volume: Requires at least 450-700 cubic feet of air—ideal in basements, garages, or large utility rooms (ENERGY STAR^®). 

• Ambient Temperature: Performs best in areas kept between 40°F and 120°F year-round (ENERGY STAR). 

• Clearances: Allow 18–24 inches on the sides and at least 12 inches from walls for proper airflow and servicing. 

• Avoid: Small closets, unconditioned spaces, or areas that may freeze. 

Electrical Requirements 

• Power Supply: Needs a dedicated 208/240-volt circuit, typically 30–50 amps depending on the model. 

• Panel Check: Confirm your panel can handle the added load before starting installation. 

• Code Compliance: All wiring must follow local codes and electrical requirements for heat pump water heaters. 

• GFCI: Some locations require GFCI protection—check local regulations. 

• We also recommend consulting with a certified electrician for any electrical updates needed. 

Plumbing Requirements 

• Connections: Hot and cold water lines must be installed with shutoff valves for maintenance. 

• Temperature & Pressure (T&P) Valve: A T&P relief valve is mandatory for safety. 

• Condensate Drainage: Install near a floor drain or use a condensate pump to remove water. Watch Installation Video 

• Water Quality: Use a softener in hard water areas to protect your system. 

Permits and Codes 

• Permits: Most jurisdictions require a building permit for heat pump water heater replacement. 

• Compliance: Installation must meet all local plumbing, electrical, and mechanical codes. 

• Inspection: A final inspection may be needed for code approval and warranty validation. 
• All code for installations are different in local ordinances and these steps are just general guidance. Check with your local ordinances to make sure your installation is compliant. 

Get a closer look: The Prestige^® ProTerra^® Hybrid Electric Heat Pump from Rheem is the most efficient water heater available. Check out its specs, installation guide, and accessories list here. 

How Do You Install a Rheem Heat Pump Water Heater Step-by-Step? 

Installing a heat pump water heater takes careful planning and attention to detail. Here’s a clear breakdown of the Rheem heat pump installation steps to guide you through the process: 

Step 1: Remove Old Unit and Prepare Area 

• Turn off power and water to your existing unit to ensure safety before starting. 

• Drain the old water heater completely using a hose to remove any remaining water. 

• Safely disconnect electrical and plumbing lines, following proper procedures. 

• Clean and level the installation area and install a drain pan if required by local code or manufacturer recommendations. 

Step 2: Position and Level New Heater 

• Place the new Rheem heat pump water heater in a location that meets clearance and airflow requirements. 

• Follow all space and clearance guidelines from the manufacturer to support efficient operation. 

• Use adjustable legs to level the unit, which is important for proper drainage and long-term performance. 

• Make sure there’s adequate airflow around the unit for optimal heat pump function. 

Step 3: Make Electrical Connections 

• Install a dedicated 208/240V circuit breaker if the water heater requires a new circuit. 

• Run wire of the correct gauge, based on local code and unit specifications. (This is a key part of safe and effective heat pump water heater wiring.) 

• Connect power using the Rheem wiring diagram, ensuring all connections are secure and accurate. 

• Install GFCI protection if it’s required by local code for your installation area. 

Step 4: Connect Water Lines 

• Attach shutoff valves to both hot and cold water lines for easier future maintenance. 

• Use dielectric unions to join copper and steel piping, which helps prevent galvanic corrosion. 

• Install the T&P relief valve and connect discharge piping according to code. 

• Run water lines with a slight upward slope to avoid air pockets that can impact performance. 

Step 5: Set Up Condensate Management 

• Connect a condensate drain line to a floor drain or an approved exterior location. 

• Install a condensate pump if gravity drainage isn’t possible, such as in a basement. 

• Ensure the drain line is protected from freezing, especially in colder climates. 

• Test the drain system to confirm that it’s removing water properly before finalizing the setup. 

Step 6: System Testing and Setup 

• Slowly fill the water heater, watching for leaks at all connection points. 

• Open hot water taps around the home to bleed air from the system. 

• Turn on power and confirm operation by checking the control panel and status lights. 

• Set your desired temperature and operating mode, whether energy-saving or high-demand. 

• Connect to the EcoNet^® App if your model includes smart features, for remote monitoring and control. 

To see it visually, catch our Installation Video. 

What Are the Best Practices for Heat Pump Water Heater Installation? 

Following heat pump water heater best practices ensures your system runs efficiently, safely, and remains protected under warranty. Here’s what to keep in mind: 

Efficiency Optimization 

To reduce heat loss, insulate the first six feet of hot water piping coming from the unit. You’ll want to choose the warmest suitable location in your home that meets installation requirements, as this helps the heat pump work more efficiently. It’s also important to make sure the air filter is easy to access so it can be cleaned or replaced regularly. If your unit includes smart features, setting up the EcoNet App allows for better scheduling, energy tracking, and remote monitoring. 

Safety and Code Compliance 

For complex installations, always hire a professional with Rheem-certified installation credentials to ensure everything is done correctly. Before beginning the job, be sure to secure all required permits to stay compliant with local regulations, and keep important documents like permits, installation manuals, and warranty information in a safe place for future reference. You’ll also want to plan for routine upkeep by scheduling an annual inspection with a licensed technician. 

Warranty Protection 

To maintain full heat pump water heater warranty coverage, it’s best to use contractors from the Rheem Professional Network. Be sure to register your new unit within 90 days of installation to activate warranty benefits and follow all setup guidelines provided by the manufacturer to ensure optimal performance and protect your investment. 

When Should You Use Professional Installation? 

While some homeowners may feel comfortable handling basic water heater replacements, there are clear situations when hiring a water heater installer becomes necessary, especially with a heat pump system. 

Situations Requiring Professional Installation 

If your installation involves setting up a new 240V electrical circuit, this work must be handled by a licensed electrician. It’s a safety-critical task that falls outside typical DIY boundaries. Similarly, any complex plumbing work, such as rerouting water lines or making major modifications, should be left to a professional. Many cities and counties also require that permits be pulled by a licensed contractor. In these cases, professional heat pump water heater installation isn’t just smart, it’s required. Most importantly, for full warranty coverage, Rheem may require professional installation. Skipping this step could impact your long-term protection. 

Benefits of Rheem-Certified Contractors 

Choosing Rheem-certified contractors offers several advantages beyond just peace of mind. These professionals have specialized training in installing and configuring Rheem heat pump water heaters, ensuring your unit is set up correctly from day one. They help protect your investment by maintaining full heat pump water heater warranty coverage and ensuring all work meets local code requirements. Certified installers also know how to fine-tune the system for maximum efficiency, including configuring smart features like EcoNet.

Not sure where to start? Use Rheem’s plumber locator to connect with trusted experts in your area. 

Heat Pump Water Heater Installation FAQ 

If you’re planning a new system or just exploring your options, this heat pump water heater installation FAQ covers some of the most common questions homeowners ask. 

Q: Can I install a heat pump water heater myself?
A: For those with solid electrical and plumbing experience, DIY heat pump installation is technically possible. However, professional installation is strongly recommended—not only for safety but also to ensure you meet warranty requirements and local codes. 

Q: How long does installation take?
A: A typical professional installation takes between 4 and 8 hours. The exact time depends on factors like the condition of existing plumbing, whether a new electrical circuit is needed, and site-specific adjustments. 

Q: Do I need special permits for heat pump water heater installation?
A: Yes, in most areas, heat pump installation permits are required. Be sure to check with your local building department before starting work to avoid delays or code violations. 

Q: What if my space doesn’t meet the standard installation requirements?
A: If your space is too small or located in a colder part of the home, Rheem offers hybrid models designed to perform well in less-than-ideal environments. These can be a great solution when traditional setups aren’t feasible. 

Q: Can I use my existing electrical circuit for the new unit?
A: You might be able to use an existing 240V circuit if it’s properly sized and meets code. Still, a professional should inspect it to ensure it’s safe and compatible with your new water heater’s electrical needs. 

Conclusion: Ensuring Successful Rheem Heat Pump Water Heater Installation 

A successful Rheem heat pump water heater installation is about more than just getting the unit in place. It’s about setting your system up for long-term performance, safety, and efficiency. Whether you decide to take on the installation yourself or go with a professional, following best practices and meeting all requirements ensures your water heater runs smoothly and remains covered under warranty. 

Rheem is here to help with experienced pros who understand the ins and outs of Rheem heat pump installation. You can also check out these helpful links and resources for manuals, setup instructions, and more! 

• Rheem Installation Manual (PDF) 

• Find a plumber near you 

• Check Rebates and Incentives in Your Area 

• EcoNet App Setup Guide 

• Rheem Heat Pump Water Heaters  

Taking a few extra minutes now to plan and prepare will go a long way toward enjoying reliable, energy-efficient hot water for years to come.