The water heater Energy Factor (EF) is a measure of the overall efficiency of the water heater. This is determined by comparing the energy in the heated water used daily to the total daily energy consumption of the water heater. The EF can be used to compare the energy efficiency of water heaters. Water heaters with higher EFs will have lower annual operating costs than comparable models with lower EFs. A higher EF signifies a more efficient the model.

This phrase appears several times in Time Enough for Love, most notably in the "Dora story." It means, simply, "Eat first, or f**k first?" and is believed to be old Navy slang (perhaps shorthand for "You wanna get some real food or some tail first?" on first hitting dirt for shore leave). Dora's reply of "Both!" might confuse some readers, but is completely in character, if you think about it - and has a couple of alternate meanings, as well. See similar questions...

It should be .There will be low heat output and high energy cost. They may be acceptable in intermittently occupied buildings or as a back up only. There will be a prompt payback of the added cost of any other form of energy. See similar questions...

Several things could happen. First check the shower head volume if shower's are too quick. A new shower head puts out about 2.5 gallons a minute. Some older heads put out 5 gallons a minute. Working with the shower head would double shower length in this case. In some cases, the dip tube on the cold water inlet has broken or worn. When this happens, it creates a short loop for the water, water at the bottom half of the tank will not be used. See similar questions...

Almost every filter holds back a part of the light (absorption) by virtue of its monochromatic character. This loss of light is compensated for when taking the picture by a corresponding increase in the exposure. The required correction value is called the multiplying factor or the filter factor. The factor itself is indicated on every B+W photo filter. The factor can also be found in your brochure. See similar questions...

EF in front of a product number means that an additional freight charge of $5.00 is required to ship the item. See similar questions...

A water heater is a heating unit that provides domestic hot water. They can generally be direct fired (fuel oil, natural gas, and electric are common), tankless, or indirect fired (operating with the boiler). See Buderus indirect, Bradford White See similar questions...

Optimal levels of water fluoridation means finding the right balance between putting enough fluoride in the water to maximize the benefits of fluoride exposure while minimizing potential to contribute to dental fluorosis. See similar questions...

We have had good luck with the Polaris, but it does require competent installation. You should have a competent gas man do the work. This is not a good do it yourself project. Some people should have been given their money back instead of getting a new Polaris, because the problem is at the site. See similar questions...

With tank type water heaters, you can draw water as fast as your plumbing will allow to you; however, when the hot water tank is depleted, you have to wait for the tank to re-heat before you can use hot water again. The tankless water heater will give you endless hot water for as long as you open a faucet. See similar questions...

Each model is about the size of a small briefcase. The Model 220, for instance, measures 17 in. x 16 in. x 3.25 in. The units are about 1/20th the size of a conventional 60-gallon tank-type water heater. Just imagine what you can do with that additional storage space. See similar questions...

In January 2004, the US Department of Energy (DOE) decided not to establish "Energy Star" criteria for the domestic water heating product category. Although this decision will be reviewed in the Fall of 2006, the DOE has acknowledged that water heaters manufactured after 2003 are produced in compliance with the National Appliance Energy Conservation Act (NAECA). See similar questions...

The pH factor should be close to neutral (7). Any pH between 6.5 and 7.5 is good. Remember, 1 is very acidic and 14 is extremely alkaline. Only salt mills and grinders having metal grinding mechanisms will cause a reaction with the salt. Ceramic mills and grinders are recommended. See similar questions...

This value gives the efficiency, of an solar module at full sun insolation (under fixed conditions). A unit, which has See similar questions...

defined by Wikipedia: "Impact Factor is a measure of importance of scientific journals. It is calculated each year by Thompson Scientific for those journals which it tracks, and the factors are published in the Journal Citation Report." See similar questions...

Every batch of Manuka Honey is tested by an independent laboratory for UMF antibacterial activity, using a testing method developed at Waikato University. Each jar is guaranteed to have an antibacterial activity 2,5 times greater than standard antiseptic (minimum 10% carbolic equivalent). See similar questions...

EMS will enhance an average PF correction to any panel that has more than one PF source because the distribution network supplying different motors has an average power factor reading at any given point. EMS will not over correct or cause harm to any of the motor loads, regardless of how many are running at different times, provided units are properly sized to the application. Over-correcting can occur only if too large a unit or too many units are used on a specific application. See similar questions...

The term human consumption includes water used for drinking, bathing, showering, cooking, dishwashing, and maintaining oral hygiene. See similar questions...