Best High Efficiency Water Heaters of 2026

The Rheem Tankless Gas Heater is a high-efficiency unit designed to provide up to 8.4 gallons per minute, making it great for homes with 2 to 3 bathrooms where you need reliable hot water for showers and laundry. It runs on natural gas with a powerful 180,000 BTU output, ensuring you get fast and consistent hot water, even when multiple taps are in use. Built for outdoor use, its sturdy metal cabinet protects the unit from the elements and allows for easy wall mounting by a professional. Plus, the hot-start feature prevents cold water bursts, so you can enjoy back-to-back showers without any uncomfortable surprises.

The Westinghouse APOLO Tankless Heater offers on-demand hot water, so you only use energy when you need it, helping you save on utility bills. Its remote control panel lets you adjust the temperature easily from indoors, giving you precise control and steady water temperature without sudden changes. With a powerful 180,000 BTU output and up to 8.1 gallons per minute flow, this heater can supply multiple showers or faucets at once, perfect for busy homes or businesses. Plus, it’s safety certified with features like a variable-speed fan and freeze protection, ensuring reliable and worry-free operation.

The Rheem Tankless Water Heater ensures you have a continuous supply of hot water for your entire household, even when multiple fixtures are in use, like showers and dishwashers. You’ll appreciate the energy savings since this high-efficiency heater operates only when hot water is needed. Additionally, with a water-saving feature, it can help you save up to 1,100 gallons of water annually. The smart hot-start programming prevents any sudden cold-water bursts, ensuring a comfortable experience every time you turn on the tap.

The Westinghouse APOLO Water Heater offers on-demand heating that only runs when you need hot water, helping you save energy and reduce costs. You can easily control the temperature from indoors with a remote panel, which keeps your water temperature steady within one degree, so you won’t experience sudden changes. With a strong 180,000 BTU power and up to 8.1 gallons per minute flow, this heater can supply hot water to multiple showers or faucets at once, perfect for busy homes or small businesses. Plus, it’s CSA certified and comes with safety features like a variable-speed fan and freeze protection, giving you peace of mind for reliable operation.

The Rheem Tankless Propane Heater provides up to 7.0 gallons per minute, making it a great fit for homes with two to three bathrooms where multiple hot water needs occur, such as showers and laundry. Running on liquid propane with 160,000 BTUs, it delivers fast and dependable hot water even during busy times. Designed for indoor use, its compact metal cabinet allows for easy wall mounting by professionals, saving space in your home. Plus, the hot-start programming helps avoid cold water bursts, so you can enjoy smooth, continuous hot showers without interruptions. This unit offers efficient and reliable performance for your household.

The Rheem Tankless Gas Heater is a high-efficiency unit designed to deliver up to 8.4 gallons per minute, making it a great choice for homes with 2 to 3 bathrooms where multiple hot water needs happen at once. Powered by natural gas and boasting 180,000 BTUs, it provides fast and dependable hot water even during busy times. This model is meant for indoor use and comes in a compact metal cabinet that can be easily wall-mounted by a professional. Its smart hot-start programming helps prevent cold water bursts, so you can enjoy back-to-back showers without discomfort or waiting.

The ThermoMate Tankless Water Heater delivers up to 5 gallons per minute of hot water, enough to run two showers at once without any cold water surprises. It keeps your water temperature steady for a comfortable shower every time. Safety is a priority with eight built-in protections, including freeze and overheat prevention, so you can trust it to work reliably. Its energy-efficient copper heat exchanger saves you money by using less fuel while providing quick, on-demand hot water. Plus, the easy-to-use LED touchscreen lets you adjust the temperature and monitor the system’s status, making it simple to keep everything running smoothly.

The Rheem Tankless Water Heater ensures you always have hot water when you need it, making it perfect for households with multiple users, such as during showers and dishwashing. It operates efficiently, only using energy when you're actually drawing hot water, which helps you save on utility bills. With its water-saving feature, you can reduce your consumption by up to 1,100 gallons a year, contributing to environmental sustainability. Additionally, the hot-start programming eliminates the frustration of cold-water bursts, keeping your water consistently warm and ready for use.

The Rinnai RX130iN Heater offers flexible installation options, allowing you to set it up indoors or outdoors with the right vent cap, and it works with both propane and natural gas. This versatility means you can place it wherever it fits your home best. Its compact size is perfect if you want to save space while still enjoying plenty of hot water—up to 7.1 gallons per minute, enough for multiple fixtures at once. The heater features a user-friendly interface and a Quick Flush system that makes maintenance easier, helping you keep it running efficiently. Plus, it boasts a high energy efficiency rating, saving you money on utility bills.

The Rheem Tankless Water Heater ensures you have hot water whenever you need it, even with multiple appliances running simultaneously. This efficient unit operates only when required, helping you save on energy bills. With built-in EcoNet Wi-Fi technology, you can easily manage settings, monitor usage, and receive maintenance alerts directly from your smartphone. Additionally, its hot-start programming prevents unexpected cold bursts, providing consistent comfort for your family. Say goodbye to cold showers and enjoy the convenience of reliable hot water at your fingertips.