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Welcome to ultimate efficiency. With technology that operates only when hot water is needed super-efficient heating coils no pilot light and no storage tank to heat and reheat water you save on energy and utility costs. In fact Rinnai Tankless Water Heaters use up to 40 percent less energy* than a traditional tank water heater. Plus with premium technology increased energy efficiency an improved Home Energy Rating System HERS Index Score and optimized LEED eligibility our tankless solutions can increase your home’s value. You can even qualify for energy efficiency rebates and tax credits. It’s a smart investment for now and the future. Energy Factor of .82 / Uniform Energy Factor of .81 Maximum output minimum space.