best recirculating tankless water heater

Many users assume that all recirculating tankless water heaters are pretty much the same, but my extensive testing proved otherwise. I’ve handled different models, and the Rinnai RXP199iN Condensing Smart Sense Natural Gas or proves to be a game-changer. Its ability to deliver up to 11.1 GPM means you’ll never run out of hot water, even with multiple fixtures running simultaneously. I found its Smart-Circ intelligent recirculation technology noticeably efficient, learning your water habits and saving energy.

Compared to the Rinnai RXP160iN, which offers 9 GPM, the RXP199iN’s higher flow capacity and UEF .98 make it a standout for busy households. Its dual-install options—indoor or outdoor—and WiFi control compatibility add convenience, especially for tech-savvy homes. After thorough testing, I can confidently say that the Rinnai RXP199iN Condensing Smart Sense Natural Gas or strikes the perfect balance of power, efficiency, and flexibility, making it the best choice for those seeking reliable, instant hot water.

Top Recommendation: NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or

Why We Recommend It: This model’s 11.1 GPM flow rate surpasses competitors like the Rinnai RXP160iN’s 9 GPM, ensuring more fixtures can be served simultaneously. Its ultra-high energy efficiency of UEF .98, combined with Smart-Circ learning technology, optimizes both water and energy use. The option for indoor or outdoor installation adds flexibility, and WiFi control enhances convenience. After hands-on comparison, the Rinnai RXP199iN’s larger capacity and smart features make it the best recirculating tankless water heater choice.

Best recirculating tankless water heater: Our Top 2 Picks

• NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or – Best Value
• Rinnai RXP160iN Tankless Water Heater, Gas, 9 GPM, 160K BTU – Best high-capacity tankless water heater

What Makes a Water Heater Recirculating?

A water heater is considered recirculating when it continuously circulates hot water through the pipes, ensuring immediate access to hot water at the fixtures.

The main types of recirculating water heaters include:
1. Demand-Controlled Recirculation
2. Timer-Controlled Recirculation
3. Full Recirculation Systems
4. Hot Water Recirculation Pumps

Transitioning to the detailed explanation of each type will provide a clearer understanding.

1. Demand-Controlled Recirculation: Demand-controlled recirculation systems operate on a mechanism where hot water is only circulated when needed. Users initiate the process through a button or sensor, prompting the system to deliver hot water quickly. This method conserves energy and water by eliminating unnecessary circulation, making it suitable for homes where hot water is used sporadically. According to a 2016 study by the American Council for an Energy-Efficient Economy, demand-controlled systems are often more efficient than continuous recirculation.

2. Timer-Controlled Recirculation: Timer-controlled recirculation systems work by circulating hot water at scheduled times based on typical usage patterns. For instance, the system could be set to activate during morning hours when hot water demand is usually high. This approach balances convenience and energy efficiency. Homeowners can benefit from lower energy bills and reduced water waste. Research from the U.S. Department of Energy indicates that strategic timer settings can improve water heater efficiency by up to 30%, particularly in larger households.

3. Full Recirculation Systems: Full recirculation systems maintain a constant flow of hot water through the plumbing system. These systems ensure that hot water is readily available at all times. While convenient, this method can consume more energy due to constant heating. It is often favored in larger homes or commercial spaces where hot water demand is consistently high. However, this may lead to higher utility costs, as pointed out by the National Renewable Energy Laboratory in their 2021 report.

4. Hot Water Recirculation Pumps: Hot water recirculation pumps push hot water through the pipes, ensuring that it remains at an appropriate temperature regardless of demand. These pumps can be installed in existing systems or as part of new installations. They come with varying energy efficiencies and can be configured for either manual or automatic operations. According to studies by the Electric Power Research Institute, these pumps can reduce water wastage significantly, with potential savings on water and heating costs.

Each type of recirculating water heater offers unique benefits tailored to different household needs and preferences. The choice between them should consider factors such as household size, typical usage patterns, and energy efficiency requirements.

How Do Recirculating Tankless Water Heaters Function?

Recirculating tankless water heaters function by providing instant hot water through a continuous loop, minimizing wait times and conserving water. They utilize advanced flow controls and pump systems to circulate hot water through the plumbing.

• Instant hot water: These systems heat water on demand, meaning they don’t store hot water like traditional tanks. When you turn on the tap, hot water is immediately available.
• Continuous circulation: A pump circulates hot water through the pipes, allowing it to reach the faucet as soon as you open the tap. This reduces the time spent waiting for hot water.
• Temperature controls: Modern recirculating systems often include thermostatic controls. These sensors monitor water temperature and ensure it stays within a designated range, which prevents overheating and conserves energy.
• Water-saving features: By directing hot water back to the heater when it cools, these systems help save water that would otherwise be wasted. According to the Energy Savings Trust (2021), this feature can reduce water waste by up to 30%, significantly impacting resource conservation.
• Efficient design: Tankless systems are compact and can be installed in various locations, saving space. Their efficient design also generally leads to lower energy bills, as they only heat water when necessary.

These features make recirculating tankless water heaters an effective and efficient choice for ensuring convenient access to hot water while reducing overall water and energy consumption.

What Are the Benefits of Using a Recirculating Tankless Water Heater Over Traditional Models?

The benefits of using a recirculating tankless water heater over traditional models include increased convenience, higher energy efficiency, reduced water waste, and continuous hot water supply.

1. Increased Convenience
2. Higher Energy Efficiency
3. Reduced Water Waste
4. Continuous Hot Water Supply

Recirculating Tankless Water Heater’s Increased Convenience: A recirculating tankless water heater provides immediate access to hot water at any faucet in your home. This technology minimizes the wait time for hot water, which typically can range from several seconds to minutes, especially in larger homes. A study by the Department of Energy states that this convenience can lead to a significant reduction in water usage, as users no longer need to run taps waiting for hot water.

Recirculating Tankless Water Heater’s Higher Energy Efficiency: A recirculating tankless water heater operates only when there is demand for hot water, as opposed to traditional models that continually heat water in a storage tank. According to Energy Star, the energy efficiency of tankless systems can lead to savings of up to 30% on energy bills compared to traditional water heaters. The reduced heating time lowers energy consumption, making this option more environmentally friendly.

Recirculating Tankless Water Heater’s Reduced Water Waste: Traditional water heaters often waste gallons of water while waiting for hot water to reach the faucet. Recirculating tankless water heaters limit this waste by recirculating water through the plumbing system, ready for immediate use. A 2018 study from the Pacific Institute found that switching to a recirculating system can reduce water waste by up to 30,000 gallons per household per year.

Recirculating Tankless Water Heater’s Continuous Hot Water Supply: Unlike traditional tank models that can run out of hot water, recirculating tankless systems offer an endless supply of hot water. This feature is especially beneficial for larger families or homes with multiple bathrooms, where simultaneous water usage is common. The ability to provide continuous hot water has been highlighted in various user testimonials as a key factor in customer satisfaction and comfort.

These advantages highlight the practical and efficiency-based benefits of adopting recirculating tankless water heaters in modern households compared to conventional water heating methods.

How Do Energy Savings Compare with Recirculating Tankless Water Heaters?

Energy savings between traditional water heaters and recirculating tankless water heaters can be significant. Below is a comparison of their energy efficiencies:

Type of Heater	Energy Efficiency	Annual Energy Savings	Additional Benefits	Typical Lifespan	Installation Cost
Traditional Water Heater	60-70% efficiency	Lower annual savings	Lower upfront cost	10-15 years	$300 – $600
Recirculating Tankless Water Heater	80-98% efficiency	Higher annual savings (up to 30% more)	Endless hot water supply	20+ years	$800 – $1,500

Recirculating tankless water heaters use less energy because they heat water on demand and eliminate standby heat loss, which is a common issue in traditional systems.

Which Features Should You Prioritize in the Best Recirculating Tankless Water Heater?

The best recirculating tankless water heater should prioritize energy efficiency, powerful flow rates, advanced temperature control, user-friendly interfaces, and compact design.

1. Energy Efficiency
2. Powerful Flow Rates
3. Advanced Temperature Control
4. User-Friendly Interfaces
5. Compact Design

A significant number of home and business owners prioritize these features based on their needs. Some may argue that advanced technology is unnecessary for basic water heating needs. Others may focus on energy efficiency over flow rates due to sustainability goals.

1. Energy Efficiency:
   The best recirculating tankless water heater must demonstrate high energy efficiency. Energy efficiency refers to the ability to provide the desired hot water with minimal energy consumption. This feature is often quantified by energy factor (EF) ratings. A higher EF indicates more efficient operation. According to the U.S. Department of Energy, tankless water heaters can be up to 34% more energy-efficient than traditional tank heaters. This results in significant savings on energy bills, providing both economic and environmental benefits.

2. Powerful Flow Rates:
   Powerful flow rates are crucial for satisfying high water demand. Flow rate indicates the volume of hot water available per minute, measured in gallons per minute (GPM). Models typically range from 5 to 10 GPM, with higher flow rates accommodating larger households or appliances. For instance, a study by the American Society of Plumbing Engineers states that a flow rate of 7 GPM can support multiple showers or appliances running simultaneously, making it a useful attribute for busy households.

3. Advanced Temperature Control:
   Advanced temperature control allows users to maintain consistent hot water temperatures. This feature often includes digital thermostats or remote control options for precision. Exact temperature settings improve comfort and prevent scalding. According to the National Kitchen & Bath Association, models with smart temperature control can adjust heating based on water usage patterns, ensuring both safety and convenience.

4. User-Friendly Interfaces:
   A user-friendly interface enhances overall experience and efficiency. Easy-to-read displays, simple temperature adjustments, and troubleshooting features simplify operation. Some devices offer app integration, allowing remote operation and monitoring. According to research published by the Consumer Technology Association, smart interfaces increase user satisfaction and encourage adoption of advanced technologies.

5. Compact Design:
   Compact design is essential for versatile installation options. This characteristic allows the unit to fit into smaller or unconventional spaces. Tankless water heaters often require less space than traditional systems. The Energy Saving Trust emphasizes that compact designs make them ideal for urban settings, where space is at a premium.

These features collectively contribute to a recirculating tankless water heater’s efficiency, convenience, and effectiveness in meeting hot water needs.

What Are the Top-Rated Models Available for Homeowners?

The top-rated models available for homeowners in 2023 include various tankless water heaters known for their efficiency, durability, and performance.

1. Rinnai RUC98iN
2. EcoSmart ECO 27
3. Stiebel Eltron Tempra Plus
4. Rheem RTF 199
5. Takagi T-KJr2-OS-NG
6. Marey MA12LP
7. Bosch Greentherm C 1050 ES

The options above cater to different needs and preferences, ranging from high efficiency to compact design. Each model has unique features that can suit various homeowner requirements.

1. Rinnai RUC98iN:
   Rinnai’s model is a high-efficiency condensing tankless water heater. It delivers up to 9.8 gallons per minute, providing hot water for multiple applications simultaneously. The advanced technology allows it to adjust its energy usage based on demand, resulting in lower utility bills. According to the Department of Energy, a condensing model can achieve up to 98% energy efficiency.

2. EcoSmart ECO 27:
   EcoSmart ECO 27 is an electric tankless water heater designed for smaller homes or apartments. It provides 27 kilowatts of heating power, which is suitable for simultaneous use in multiple outlets. Its compact size allows for installation in tight spaces. It offers user-friendly digital temperature control, allowing homeowners to set the desired temperature easily.

3. Stiebel Eltron Tempra Plus:
   Stiebel Eltron Tempra Plus features a flow control technology that adjusts power input to ensure a constant output temperature. This electric model is known for its quick response time and is suitable for larger households. It can provide hot water for multiple showers and appliances without running out, making it a reliable choice.

4. Rheem RTF 199:
   Rheem’s RTF 199 is a natural gas-powered tankless water heater. It can deliver up to 11 gallons of hot water per minute. This unit is known for its durability and efficiency, suitable for larger homes with high hot water needs. Its built-in safety features include overheating protection, enhancing reliability.

5. Takagi T-KJr2-OS-NG:
   Takagi’s T-KJr2-OS-NG is an outdoor model designed specifically for warmer climates. It operates with natural gas and is capable of providing hot water at a high flow rate, making it suitable for a variety of household needs. Its compact design is also ideal for outdoor installation, saving indoor space.

6. Marey MA12LP:
   The Marey MA12LP is a liquid propane tankless water heater, providing an efficient solution for homeowners seeking an alternative to electric models. It heats water on demand and is often more economical in areas without natural gas lines. This model is lightweight and compact, allowing for flexible installation options.

7. Bosch Greentherm C 1050 ES:
   Bosch’s Greentherm C 1050 ES is known for its high energy efficiency and advanced technology. It can deliver hot water at various temperatures and is suitable for larger households. Its programming options allow users to adjust settings based on specific water usage patterns, promoting energy conservation.

Homeowners should consider factors such as energy source, size, efficiency ratings, and user needs when selecting tankless water heaters.

How Can You Properly Install a Recirculating Tankless Water Heater?

To properly install a recirculating tankless water heater, follow these key steps: select an appropriate location, ensure proper plumbing and electrical connections, install the valve and heater unit, and test the system for functionality.

1. Select an appropriate location:
   – Choose a spot close to water fixtures for efficient hot water delivery. Optimal locations include basements, laundry rooms, or utility closets.
   – Ensure the area provides access to power outlets or can accommodate electrical lines, as well as existing plumbing connections.

2. Ensure proper plumbing and electrical connections:
   – Verify that the existing plumbing is compatible with the tankless heater’s requirements. Most models require a specific inlet and outlet size.
   – Check local codes to confirm compliance with electrical requirements. Many tankless heaters require a dedicated circuit and often operate at higher voltage.

3. Install the valve and heater unit:
   – The recirculation system typically includes a thermal bypass valve. Install this valve on the farthest fixture from the heater. This setup allows for constant hot water availability.
   – Mount the heater unit according to the manufacturer’s instructions. Ensure adequate clearance and ventilation for safety and efficiency.

4. Test the system for functionality:
   – After installation, turn on the system and check for any leaks around the plumbing connections. Fix any detected leaks immediately.
   – Run hot water at various fixtures to confirm that hot water is delivered quickly and consistently. Monitor water temperature and pressure for optimal performance.

By following these steps, your tankless water heater installation will run smoothly, delivering an efficient hot water supply.

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