For larger applications that require multiple water heaters to work in conjunction, all of Takagi’s commercial tankless heaters feature the Easy-Link system. This allows installers to easily manifold up to 4 units without the need for a system controller. The controls are already built into each model’s internal computer. The Easy-Link system ensures proper modulation, using only the amount of energy required so that there is never any waste. Refer to each model's installation instructions for details.