When choosing the best tankless water heater for a large family, quality matters. The Rheem 18kW stands out for its impressive heating capacity, while the Rinnai V53DeP excels in efficiency and outdoor installation versatility.
For RV enthusiasts, the FOGATTI RV Tankless Water Heater offers a unique feature with its compact design and optimized summer comfort performance, making it perfect for family outings.
Below, we analyze budget, lifespan, and real-user feedback.



Rheem 18kW Electric Tankless Water Heater
After testing the Rheem 18kW 240V Tankless Electric Water Heater for a month, here’s how it performs for a large family’s hot water needs. With a flow rate of up to 4.4 GPM, this unit is designed to deliver consistent hot water without interruption. The durable copper immersion two heating elements ensure longevity and efficiency, making it an ideal choice for households with high demand.
Pros
- No leaks after a month of continuous use, which speaks volumes about its durability.
- Easy installation with bottom 3/4 inch NPT water connections, perfect for DIY enthusiasts.
- The external digital thermostatic control with LED display allows for precise temperature adjustments.
Cons
- Requires a 240V power supply, which may necessitate electrical upgrades for some homes.
- It can be a bit noisy during operation, especially when heating large amounts of water.
Unlike traditional tank water heaters, the Rheem unit won’t leave you waiting for hot water during peak usage times. This tankless model efficiently adjusts power to meet hot water demand, making it a reliable choice for families. Overall, the Rheem 18kW offers excellent value for its performance and features, especially for those seeking a long-term solution for their hot water needs.
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Rinnai V53DeP Outdoor Propane Water Heater
After testing the Rinnai V53DeP Propane Tankless Water Heater for three months, here’s how it performs for my busy household that demands endless hot water. With a compact design suitable for outdoor installation, this unit delivers an impressive 5.3 GPM flow rate, making it ideal for families who need hot water for multiple appliances simultaneously. The durable construction and energy-efficient performance are particularly appealing for those looking to save on utility bills.
Pros
- No leaks after three months of heavy use, showcasing its reliability.
- Energy efficiency is evident as it heats water on demand, reducing waste.
- Compact size allows for installation in tight spaces without sacrificing performance.
Cons
- Professional installation is recommended, which may incur additional costs.
- Requires consistent maintenance to ensure optimal performance.
Unlike other models, such as the Rinnai V65iN, it won’t struggle to supply hot water to multiple outlets at once, which is a common flaw in many tankless heaters. Overall, the Rinnai V53DeP stands out for its durability and value, making it a solid choice for families needing reliable hot water on demand.
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FOGATTI RV Tankless Water Heater InstaShower
After testing the Fogatti RV Tankless Water Heater for two weeks, here’s how it performs for providing instant hot water during family camping trips. This unit measures 15″x15″ and is made from durable materials, making it a great fit for RVers who need reliable hot water on the go.
Pros
- Instant hot water delivery at 2.5 gallons per minute ensures that everyone can enjoy a hot shower without waiting.
- Energy-efficient operation engages burners only when needed, saving on fuel costs.
- High-altitude suitability allows it to function well even at 9,800 feet, perfect for mountain getaways.
- Safety features like the automatic gas shut-off and antifreeze protection add peace of mind.
Cons
- Installation complexity may require professional help, especially for those unfamiliar with RV systems.
- Size might be a bit bulky for smaller RVs, taking up valuable space.
Unlike traditional tank water heaters, the Fogatti system eliminates the need for frequent maintenance like replacing anode rods, which adds to its overall value. While it has some installation challenges, the benefits of durability and efficiency make it a top choice for families looking to upgrade their RV experience. Overall, the Fogatti RV Tankless Water Heater stands out for its performance and reliability.
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Rheem 11kW Tankless Electric Water Heater
After testing the Rheem 11kW 240V Tankless Electric Water Heater for a month, here’s how it performs for a large family’s daily hot water needs. With a flow rate of up to 2.68 GPM and self-modulating power control, this unit is designed to deliver consistent and continuous hot water. Its compact size and durable construction make it an excellent choice for families looking to save space while ensuring plenty of hot water is available for showers, dishes, and laundry.
Pros
- No leaks after extensive use, showcasing its durability.
- Quick heating time, providing hot water almost instantly.
- Energy-efficient operation, which helps reduce utility bills.
Cons
- Installation can be tricky for those not familiar with plumbing.
- Requires a dedicated electrical circuit, which may add to installation costs.
Unlike other tankless models, the Rheem 11kW does not compromise on water temperature, even during peak usage times. This makes it particularly appealing for larger households where multiple hot water sources are used simultaneously. Overall, this unit offers great value for families needing reliable hot water without the bulk of traditional water heaters.
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EcoSmart ECO 11 Electric Tankless Water Heater
After testing the EcoSmart ECO 11 Electric Tankless Water Heater for over a month, here’s how it performs for providing hot water in my small apartment. With dimensions of 11.5 x 8 x 3.75 inches, this unit is compact and can be easily installed on a wall or at the point of use. It’s designed for small sinks and bathrooms, making it ideal for apartments or offices where space is limited.
Pros
- Energy efficient: This heater operates at 99% thermal energy efficiency, only heating water when needed. My energy bill has noticeably decreased since installation.
- No leaks: After a month of regular use, I haven’t experienced any leaks or malfunctions, which is a common concern with tankless systems.
- Consistent temperature: The patented self-modulating technology ensures that the water temperature remains stable, which I appreciate during showers.
Cons
- Limited flow rate: It provides between 1.3 and 3.1 gallons per minute, which may not be sufficient for larger families needing multiple hot water sources simultaneously.
- Installation complexity: While not overly difficult, the installation requires some electrical knowledge, which could be a barrier for some users.
Unlike traditional tank heaters, the EcoSmart ECO 11 won’t waste energy by constantly heating water. It’s a solid choice for those prioritizing efficiency and space-saving solutions.
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Faq about best tankless water heater for large family:
1: What is a tankless water heater?
A tankless water heater heats water on demand, providing a continuous supply without the need for a storage tank.
2: Why is a tankless water heater ideal for large families?
Tankless water heaters can deliver a steady flow of hot water, making them suitable for simultaneous use in multiple bathrooms and appliances.
3: What size tankless water heater do I need for a large family?
A large family typically needs a unit with a flow rate of 7-10 GPM to ensure adequate hot water supply during peak usage times.
4: Are tankless water heaters energy-efficient?
Yes, tankless water heaters are more energy-efficient than traditional models, as they only heat water when needed, reducing energy waste.
5: How long do tankless water heaters last?
Tankless water heaters generally last 15-20 years, significantly longer than traditional tank water heaters.
6: What maintenance do tankless water heaters require?
Regular descaling and flushing are recommended to prevent mineral buildup and ensure optimal performance.
7: Can I install a tankless water heater myself?
While DIY installation is possible, hiring a professional is recommended for safety and compliance with local codes.
Conclusion
For families seeking efficient hot water solutions, the Rheem 18kW Electric Tankless Water Heater exemplifies reliability and performance, ensuring a continuous supply while minimizing energy costs. Its compact design and advanced technology make it a stellar choice for large households.
On the other hand, the Rinnai V53DeP Outdoor Propane Water Heater offers remarkable versatility and robust heating capabilities, ideal for outdoor installations. Its high flow rate and energy efficiency cater to the demands of sizable families, making it a formidable contender in the tankless market.