Delivers more hot water than standard direct fired tanks when paired with high efficiency boilers;Stainless steel construction including pickled and passivated tank, water connections and high-capacity smooth wall coil resist corrosion for long-life;Top DHW connections and side boiler connections increase install efficiency while saving time, money, and labor (DTI 40, 55 and 65);Lightweight for easy installation;2" of polystyrene foam insulation for an extremely low standby heat loss;Removable inspection port for easy access to coil and tank;Standard Aquastat & 10K temperature sensor