How We Rate Tankless Water Heaters
Environmental Impact
Our Environmental Impact Rating for Tankless Water Heaters is based on a product's Consumption Rating (see below), warranty on heat exchanger, manufacturing location and manufacturer's commitment(s) to environmental stewardship. The higher the Environmental Impact Rating, the lesser the environmental impact of the product relative to others within the category.
Consumption
Our Consumption Rating for Tankless Water Heaters is based on a product’s Energy Factor relative to others within the category. Energy Factor is the ratio of useful energy output from a product to the total amount of energy delivered to the product. The higher the EF, the more efficient the tankless water heater. The higher the Consumption Rating, the more energy-efficient the product.
Lifecycle Cost
Our Consumption Rating for Tankless Water Heaters is based on a product’s Energy Factor relative to others within the category. Energy Factor is the ratio of useful energy output from a product to the total amount of energy delivered to the product. The higher the EF, the more efficient the tankless water heater. The higher the Consumption Rating, the more energy-efficient the product.
Price
Our Price Rating for Tankless Water Heaters is based on a product’s purchase price relative to others within the category. The higher the Price Rating, the better (lower) the price of the product.
