Sanden's SANCO2 has the highest efficiency and First Hour Rating of any HPWH It's unique Split design allows the Heat Pump to be located up to 50ft away from the Stainless Steel Storage tank, with only 2 x 1/2" water lines connecting the system The Stainless Steel Storage tanks are available in 2 sizes, 43 and 83 Gallons and do not have back up electric elements, the system can deliver water temperatures up to 176 DegF The Heat Pump is capable of providing 4.5kw of capacity, down to 5 DegF and the Heat Pump can operate in ambients below -20 DegF, due to our use of CO2 as a refrigerant More