“Atmospherically vented” water heaters with metal flue pipes raise a lot of combustion-related safety risks, including vulnerable appliances, pressure imbalance, back drafting etc. Furthermore, water heaters are the second highest source of energy usage in the home, but ENERGY STAR certified water heaters reduce up to 50% of energy usage. It is not suggested in the New Jersey Clean Energy guideline that leaving any "Atmospherically vented" water heater in the house if the house is going through the "whole-house" design approach. We choose ENERGY STAR certified products like The Rinnai Sensei tankless water heating system that provides endless hot water with much less energy consumption.