Hot Water on Demand Powered By the 006e3 ® Hot Water Circulation Pump Stop waiting for hot water! With the SmartPlus-e instant hot water system, Taco has combined the ECM high-efficiency 006e3 hot water circulation pump with the intelligence of the award winning SmartPlug Instant Hot Water Control ®! The SmartPlus-e ® ECM High-Efficiency Instant Hot Water System provides instant hot water while maximizing energy savings. Ideal for systems with a tank water heater and dedicated hot water return line.