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50 Eco-Friendly Products Selected by Green Builder's Editors



Designed for smaller residential applications with up to 1.5 baths, the E50C touts the highest efficiency of any combi boiler on the market: 95.6 percent AFUE. With an input range of 13,600 to 50,000 Btu, this new boiler can be fueled by natural gas or propane, and is wall-mounted to save space. All Rinnai E Series boilers feature a high-performing, durable, stainless-steel heat exchanger, and comply with low-NOx requirements.

Rinnai E50C condensing combi boiler

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This Energy Star-certified package comes ready for installation, decreasing the learning curve for customers who are new to solar. SolPak includes a Solaraide tank, collectors, controller, multi-speed pump, mixing valve, glycol solution (for closed-loop option) and thermal expansion tank. These systems can provide up to 80 percent of a home’s hot water, depending on the climate. Customers can choose a system with either gas or electric backup, and tank and collector sizes to meet their demand.

Rheem SolPak solar water heating

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This condensing type water heater captures heat from the exhaust gas, and uses it to preheat incoming cold water as it passes through the secondary heat exchanger. It operates with an Energy Factor of 0.91 for natural gas, and 0.93 for LP—ratings nearly ten points higher than a comparably sized, conventional tankless unit, and approximately 30 points higher than a standard, tank-type gas-fired water heater. The NRC661 uses recyclable components and replaceable parts, and the heat exchanger comes with a 12-year warranty.

Noritz NRC661 tankless water heater

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Water heaters in this series have an energy factor of 0.98, and use approximately 40 percent less energy than a 0.60 EF storage type water heater. A secondary, stainless-steel heat exchanger traps and uses condensation created from incoming cold water, which cools the hot gases inside the unit. This condensation would normally escape through the vents in a conventional tankless water heater. NPE-S Series water heaters have a maximum input of 150,000 to 199,900 BTUs per hour, and meet Ultra-Low NOx requirements.

Navien NPE-S Series tankless water heaters

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