Hot Water on Demand--And No Energy Penalty

Running water down the drain while waiting for hot water to get to the tap wastes over 10,000 gallons (38,000 l) each year in an average American household. The most common strategy for reducing this tremendous waste is a hot water recirculation system, which keeps hot water moving through the pipes, so it’s always right there when the faucet is opened. Unfortunately, circulating hot water through the pipes results in an enormous waste of energy because the water must be frequently reheated and because a pump is running constantly. Adding timed controls and temperature sensors to reduce the circulation time can cut down on these energy losses, but they remain substantial. Circulation on demand, however, eliminates the energy penalty, while only slightly reducing the convenience. That’s the principle behind the Metlund Hot Water Demand System from Advanced Conservation Technology (ACT).