Water Saving Products The cost of waiting.... The loss of water while waiting for hot water could be 3 to 7 gallons. Since most homeowners do not stand and wait for hot water to arrive, another 1 to 3 gallons may be lost before they notice hot water has arrived. Savings of energy and water, plus extending the life of water heaters - a Hot Water Pump System has a significant return on investment. Since federal regulations require the use of low flow fixtures and eight out of ten homes have long waits for hot water at one or more fixtures, it is easy to see the added convenience and cost savings of instant hot water delivery. This particular hot water system can be activated by the push of a button, by a thermostat, timer or the best option - motion sensor. The "off sensor" automatically shuts off the pump and closes the zone valve when hot water arrives at the system. Much better than the typical pumps that run for long durations.