 | The METLUND D'mand® System is designed to move the hot water from your most remote fixture on D'mand® within seconds and can be installed in either an existing home or a new home. More Details... | Required on all tankless water heaters over 100,000 Btu (Takagi TKJr., TK1, TK2, TKD20, TM1; Paloma PH16FS). More Details... | Easy two step installation of your tankless water heater with unsurpassed safety, features and benefits. More Details... | Required on tankless water heaters under 100,000 Btu (Paloma PH12 and Paloma PH6). More Details... |  |