The best ratio of household energy storage water tank and air energy

How much energy does a fifty-gallon electric-resistance storage water heater use?

Typical fifty-gallon electric-resistance storage water heaters have Energy Factors that range from 0.904 to 0.95. Using the DOE test procedure for calculations, a fifty-gallon electric-resistance storage water heater with an Energy Factor of 0.95 would consume 4,622 kilowatt-hours per year (see Table 1 on page nine for figures).

How do you manage water-heating energy costs?

Water-heating energy costs can be managed by selecting the appropriate fuel and water heater type, using efficient system design, and reducing hot water consumption. Demand (tankless or instantaneous) water heaters—heat water directly without use of a storage tank.

What is the energy factor for a storage water heater?

DOE will include high-efficiency gas storage water heaters with a minimum Energy Factor of 0.62 at the onset of the program for a limited timeframe. On September 1, 2010, the minimum Energy Factor will increase to 0.67 for qualification. DOE is including residential high-efficiency gas (natural gas and propane) storage water heaters in the program.

Are electric-resistance storage water heaters energy efficient?

The individual energy savings of both electric-resistance storage and tankless water heaters are low. Typical fifty-gallon electric-resistance storage water heaters have Energy Factors that range from 0.904 to 0.95.

What is the relationship between hot and total water consumption?

There is a consistent pattern in the ratio between hot and total water consumption. Hot to total water consumption ratio tends to a constant for high and low temperatures. From a sustainable development perspective, reducing hot water consumption poses the opportunity for increasing water and energy efficiency simultaneously.

How much energy does a gas storage water heater use?

Using the DOE test procedure for calculations, a fifty-gallon gas storage water heater with a 0.62 Energy Factor would consume an estimated 242 therms per year. This is a savings of 7.3%, or 19 therms, in comparison to the typical conventional gas water heater. The annual energy savings equal $26 using the national average gas rate.